<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/num-derive-0.2.5/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../num_derive/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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<span id="631">631</span>
<span id="632">632</span>
<span id="633">633</span>
<span id="634">634</span>
<span id="635">635</span>
<span id="636">636</span>
<span id="637">637</span>
<span id="638">638</span>
<span id="639">639</span>
<span id="640">640</span>
<span id="641">641</span>
<span id="642">642</span>
<span id="643">643</span>
<span id="644">644</span>
<span id="645">645</span>
<span id="646">646</span>
<span id="647">647</span>
<span id="648">648</span>
<span id="649">649</span>
<span id="650">650</span>
<span id="651">651</span>
<span id="652">652</span>
<span id="653">653</span>
<span id="654">654</span>
<span id="655">655</span>
<span id="656">656</span>
<span id="657">657</span>
<span id="658">658</span>
<span id="659">659</span>
<span id="660">660</span>
<span id="661">661</span>
<span id="662">662</span>
<span id="663">663</span>
<span id="664">664</span>
<span id="665">665</span>
<span id="666">666</span>
<span id="667">667</span>
<span id="668">668</span>
<span id="669">669</span>
<span id="670">670</span>
<span id="671">671</span>
<span id="672">672</span>
<span id="673">673</span>
<span id="674">674</span>
<span id="675">675</span>
<span id="676">676</span>
<span id="677">677</span>
<span id="678">678</span>
<span id="679">679</span>
<span id="680">680</span>
<span id="681">681</span>
<span id="682">682</span>
<span id="683">683</span>
<span id="684">684</span>
<span id="685">685</span>
<span id="686">686</span>
<span id="687">687</span>
<span id="688">688</span>
<span id="689">689</span>
<span id="690">690</span>
<span id="691">691</span>
<span id="692">692</span>
<span id="693">693</span>
<span id="694">694</span>
<span id="695">695</span>
<span id="696">696</span>
<span id="697">697</span>
<span id="698">698</span>
<span id="699">699</span>
<span id="700">700</span>
<span id="701">701</span>
<span id="702">702</span>
<span id="703">703</span>
<span id="704">704</span>
<span id="705">705</span>
<span id="706">706</span>
<span id="707">707</span>
<span id="708">708</span>
<span id="709">709</span>
<span id="710">710</span>
<span id="711">711</span>
<span id="712">712</span>
<span id="713">713</span>
<span id="714">714</span>
<span id="715">715</span>
<span id="716">716</span>
<span id="717">717</span>
<span id="718">718</span>
<span id="719">719</span>
<span id="720">720</span>
<span id="721">721</span>
<span id="722">722</span>
<span id="723">723</span>
<span id="724">724</span>
<span id="725">725</span>
<span id="726">726</span>
<span id="727">727</span>
<span id="728">728</span>
<span id="729">729</span>
<span id="730">730</span>
<span id="731">731</span>
<span id="732">732</span>
<span id="733">733</span>
<span id="734">734</span>
<span id="735">735</span>
<span id="736">736</span>
<span id="737">737</span>
<span id="738">738</span>
<span id="739">739</span>
<span id="740">740</span>
<span id="741">741</span>
<span id="742">742</span>
<span id="743">743</span>
<span id="744">744</span>
<span id="745">745</span>
<span id="746">746</span>
<span id="747">747</span>
<span id="748">748</span>
<span id="749">749</span>
<span id="750">750</span>
<span id="751">751</span>
<span id="752">752</span>
<span id="753">753</span>
<span id="754">754</span>
<span id="755">755</span>
<span id="756">756</span>
<span id="757">757</span>
<span id="758">758</span>
<span id="759">759</span>
<span id="760">760</span>
<span id="761">761</span>
<span id="762">762</span>
<span id="763">763</span>
<span id="764">764</span>
<span id="765">765</span>
<span id="766">766</span>
<span id="767">767</span>
<span id="768">768</span>
<span id="769">769</span>
<span id="770">770</span>
<span id="771">771</span>
<span id="772">772</span>
<span id="773">773</span>
<span id="774">774</span>
<span id="775">775</span>
<span id="776">776</span>
<span id="777">777</span>
<span id="778">778</span>
<span id="779">779</span>
<span id="780">780</span>
<span id="781">781</span>
<span id="782">782</span>
<span id="783">783</span>
<span id="784">784</span>
<span id="785">785</span>
<span id="786">786</span>
<span id="787">787</span>
<span id="788">788</span>
<span id="789">789</span>
<span id="790">790</span>
<span id="791">791</span>
<span id="792">792</span>
<span id="793">793</span>
<span id="794">794</span>
<span id="795">795</span>
<span id="796">796</span>
<span id="797">797</span>
</pre><div class="example-wrap"><pre class="rust ">
<span class="comment">// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="attribute">#![<span class="ident">crate_type</span> <span class="op">=</span> <span class="string">"proc-macro"</span>]</span>
<span class="attribute">#![<span class="ident">doc</span>(<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://docs.rs/num-derive/0.2"</span>)]</span>
<span class="attribute">#![<span class="ident">recursion_limit</span> <span class="op">=</span> <span class="string">"512"</span>]</span>
<span class="doccomment">//! Procedural macros to derive numeric traits in Rust.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Usage</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Add this to your `Cargo.toml`:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```toml</span>
<span class="doccomment">//! [dependencies]</span>
<span class="doccomment">//! num-traits = "0.2"</span>
<span class="doccomment">//! num-derive = "0.2"</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Then you can derive traits on your own types:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! #[macro_use]</span>
<span class="doccomment">//! extern crate num_derive;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! #[derive(FromPrimitive, ToPrimitive)]</span>
<span class="doccomment">//! enum Color {</span>
<span class="doccomment">//! Red,</span>
<span class="doccomment">//! Blue,</span>
<span class="doccomment">//! Green,</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! ```</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">proc_macro</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">proc_macro2</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">quote</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
<span class="kw">use</span> <span class="ident">proc_macro</span>::<span class="ident">TokenStream</span>;
<span class="kw">use</span> <span class="ident">proc_macro2</span>::<span class="ident">Span</span>;
<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">Data</span>, <span class="ident">Fields</span>, <span class="ident">Ident</span>};
<span class="comment">// Within `exp`, you can bring things into scope with `extern crate`.</span>
<span class="comment">//</span>
<span class="comment">// We don't want to assume that `num_traits::` is in scope - the user may have imported it under a</span>
<span class="comment">// different name, or may have imported it in a non-toplevel module (common when putting impls</span>
<span class="comment">// behind a feature gate).</span>
<span class="comment">//</span>
<span class="comment">// Solution: let's just generate `extern crate num_traits as _num_traits` and then refer to</span>
<span class="comment">// `_num_traits` in the derived code. However, macros are not allowed to produce `extern crate`</span>
<span class="comment">// statements at the toplevel.</span>
<span class="comment">//</span>
<span class="comment">// Solution: let's generate `mod _impl_foo` and import num_traits within that. However, now we</span>
<span class="comment">// lose access to private members of the surrounding module. This is a problem if, for example,</span>
<span class="comment">// we're deriving for a newtype, where the inner type is defined in the same module, but not</span>
<span class="comment">// exported.</span>
<span class="comment">//</span>
<span class="comment">// Solution: use the dummy const trick. For some reason, `extern crate` statements are allowed</span>
<span class="comment">// here, but everything from the surrounding module is in scope. This trick is taken from serde.</span>
<span class="kw">fn</span> <span class="ident">dummy_const_trick</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">quote</span>::<span class="ident">ToTokens</span><span class="op">></span>(
<span class="ident">trait_</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">proc_macro2</span>::<span class="ident">Ident</span>,
<span class="ident">exp</span>: <span class="ident">T</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">proc_macro2</span>::<span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">dummy_const</span> <span class="op">=</span> <span class="ident">Ident</span>::<span class="ident">new</span>(
<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"_IMPL_NUM_{}_FOR_{}"</span>, <span class="ident">trait_</span>, <span class="ident">unraw</span>(<span class="ident">name</span>)),
<span class="ident">Span</span>::<span class="ident">call_site</span>(),
);
<span class="macro">quote</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_upper_case_globals</span>, <span class="ident">unused_attributes</span>, <span class="ident">unused_qualifications</span>)]</span>
<span class="kw">const</span> #<span class="ident">dummy_const</span>: () <span class="op">=</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unknown_lints</span>)]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cargo-clippy"</span>, <span class="ident">allow</span>(<span class="ident">useless_attribute</span>))]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">rust_2018_idioms</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">num_traits</span> <span class="kw">as</span> <span class="ident">_num_traits</span>;
#<span class="ident">exp</span>
};
}
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">fn</span> <span class="ident">unraw</span>(<span class="ident">ident</span>: <span class="kw-2">&</span><span class="ident">proc_macro2</span>::<span class="ident">Ident</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> {
<span class="comment">// str::trim_start_matches was added in 1.30, trim_left_matches deprecated</span>
<span class="comment">// in 1.33. We currently support rustc back to 1.15 so we need to continue</span>
<span class="comment">// to use the deprecated one.</span>
<span class="ident">ident</span>.<span class="ident">to_string</span>().<span class="ident">trim_left_matches</span>(<span class="string">"r#"</span>).<span class="ident">to_owned</span>()
}
<span class="comment">// If `data` is a newtype, return the type it's wrapping.</span>
<span class="kw">fn</span> <span class="ident">newtype_inner</span>(<span class="ident">data</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Data</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Type</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="ident">data</span> {
<span class="ident">Data</span>::<span class="ident">Struct</span>(<span class="kw-2">ref</span> <span class="ident">s</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">s</span>.<span class="ident">fields</span> {
<span class="ident">Fields</span>::<span class="ident">Unnamed</span>(<span class="kw-2">ref</span> <span class="ident">fs</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">fs</span>.<span class="ident">unnamed</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
<span class="prelude-val">Some</span>(<span class="ident">fs</span>.<span class="ident">unnamed</span>[<span class="number">0</span>].<span class="ident">ty</span>.<span class="ident">clone</span>())
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="ident">Fields</span>::<span class="ident">Named</span>(<span class="kw-2">ref</span> <span class="ident">fs</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">fs</span>.<span class="ident">named</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"num-derive doesn't know how to handle newtypes with named fields yet. \
Please use a tuple-style newtype, or submit a PR!"</span>);
}
<span class="prelude-val">None</span>
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Derives [`num_traits::FromPrimitive`][from] for simple enums and newtypes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [from]: https://docs.rs/num-traits/0.2/num_traits/cast/trait.FromPrimitive.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Simple enums can be derived:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate num_derive;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[derive(FromPrimitive)]</span>
<span class="doccomment">/// enum Color {</span>
<span class="doccomment">/// Red,</span>
<span class="doccomment">/// Blue,</span>
<span class="doccomment">/// Green = 42,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # fn main() {}</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Enums that contain data are not allowed:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```compile_fail</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate num_derive;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[derive(FromPrimitive)]</span>
<span class="doccomment">/// enum Color {</span>
<span class="doccomment">/// Rgb(u8, u8, u8),</span>
<span class="doccomment">/// Hsv(u8, u8, u8),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # fn main() {}</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Structs are not allowed:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```compile_fail</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate num_derive;</span>
<span class="doccomment">/// #[derive(FromPrimitive)]</span>
<span class="doccomment">/// struct Color {</span>
<span class="doccomment">/// r: u8,</span>
<span class="doccomment">/// g: u8,</span>
<span class="doccomment">/// b: u8,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # fn main() {}</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">FromPrimitive</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_primitive</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">ast</span>: <span class="ident">syn</span>::<span class="ident">DeriveInput</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> <span class="ident">impl_</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">inner_ty</span>) <span class="op">=</span> <span class="ident">newtype_inner</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">data</span>) {
<span class="kw">let</span> <span class="ident">i128_fns</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">has_i128</span>) {
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">fn</span> <span class="ident">from_i128</span>(<span class="ident">n</span>: <span class="ident">i128</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_i128</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_u128</span>(<span class="ident">n</span>: <span class="ident">u128</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_u128</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
}
} <span class="kw">else</span> {
<span class="macro">quote</span><span class="macro">!</span> {}
};
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">fn</span> <span class="ident">from_i64</span>(<span class="ident">n</span>: <span class="ident">i64</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_i64</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_u64</span>(<span class="ident">n</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_u64</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_isize</span>(<span class="ident">n</span>: <span class="ident">isize</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_isize</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_i8</span>(<span class="ident">n</span>: <span class="ident">i8</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_i8</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_i16</span>(<span class="ident">n</span>: <span class="ident">i16</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_i16</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_i32</span>(<span class="ident">n</span>: <span class="ident">i32</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_i32</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_usize</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_u8</span>(<span class="ident">n</span>: <span class="ident">u8</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_u8</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_u16</span>(<span class="ident">n</span>: <span class="ident">u16</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_u16</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_u32</span>(<span class="ident">n</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_u32</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_f32</span>(<span class="ident">n</span>: <span class="ident">f32</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_f32</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
<span class="kw">fn</span> <span class="ident">from_f64</span>(<span class="ident">n</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span><span class="op">></span>::<span class="ident">from_f64</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
#<span class="ident">i128_fns</span>
}
}
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">variants</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">ast</span>.<span class="ident">data</span> {
<span class="ident">Data</span>::<span class="ident">Enum</span>(<span class="kw-2">ref</span> <span class="ident">data_enum</span>) <span class="op">=</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">data_enum</span>.<span class="ident">variants</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(
<span class="string">"`FromPrimitive` can be applied only to enums and newtypes, {} is neither"</span>,
<span class="ident">name</span>
),
};
<span class="kw">let</span> <span class="ident">from_i64_var</span> <span class="op">=</span> <span class="macro">quote</span><span class="macro">!</span> { <span class="ident">n</span> };
<span class="kw">let</span> <span class="ident">clauses</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">variants</span>
.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">variant</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">ident</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">ident</span>;
<span class="kw">match</span> <span class="ident">variant</span>.<span class="ident">fields</span> {
<span class="ident">Fields</span>::<span class="ident">Unit</span> <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(
<span class="string">"`FromPrimitive` can be applied only to unitary enums and newtypes, \
{}::{} is either struct or tuple"</span>,
<span class="ident">name</span>, <span class="ident">ident</span>
),
}
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">if</span> #<span class="ident">from_i64_var</span> <span class="op">=</span><span class="op">=</span> #<span class="ident">name</span>::#<span class="ident">ident</span> <span class="kw">as</span> <span class="ident">i64</span> {
<span class="prelude-val">Some</span>(#<span class="ident">name</span>::#<span class="ident">ident</span>)
}
}
})
.<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">from_i64_var</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">clauses</span>.<span class="ident">is_empty</span>() {
<span class="macro">quote</span><span class="macro">!</span>(<span class="kw">_</span>)
} <span class="kw">else</span> {
<span class="ident">from_i64_var</span>
};
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">FromPrimitive</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">trivial_numeric_casts</span>)]</span>
<span class="kw">fn</span> <span class="ident">from_i64</span>(#<span class="ident">from_i64_var</span>: <span class="ident">i64</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
#(#<span class="ident">clauses</span> <span class="kw">else</span>)<span class="op">*</span> {
<span class="prelude-val">None</span>
}
}
<span class="kw">fn</span> <span class="ident">from_u64</span>(<span class="ident">n</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="self">Self</span>::<span class="ident">from_i64</span>(<span class="ident">n</span> <span class="kw">as</span> <span class="ident">i64</span>)
}
}
}
};
<span class="ident">dummy_const_trick</span>(<span class="string">"FromPrimitive"</span>, <span class="kw-2">&</span><span class="ident">name</span>, <span class="ident">impl_</span>).<span class="ident">into</span>()
}
<span class="doccomment">/// Derives [`num_traits::ToPrimitive`][to] for simple enums and newtypes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [to]: https://docs.rs/num-traits/0.2/num_traits/cast/trait.ToPrimitive.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Simple enums can be derived:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate num_derive;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[derive(ToPrimitive)]</span>
<span class="doccomment">/// enum Color {</span>
<span class="doccomment">/// Red,</span>
<span class="doccomment">/// Blue,</span>
<span class="doccomment">/// Green = 42,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # fn main() {}</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Enums that contain data are not allowed:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```compile_fail</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate num_derive;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[derive(ToPrimitive)]</span>
<span class="doccomment">/// enum Color {</span>
<span class="doccomment">/// Rgb(u8, u8, u8),</span>
<span class="doccomment">/// Hsv(u8, u8, u8),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # fn main() {}</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Structs are not allowed:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```compile_fail</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate num_derive;</span>
<span class="doccomment">/// #[derive(ToPrimitive)]</span>
<span class="doccomment">/// struct Color {</span>
<span class="doccomment">/// r: u8,</span>
<span class="doccomment">/// g: u8,</span>
<span class="doccomment">/// b: u8,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # fn main() {}</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">ToPrimitive</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_primitive</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">ast</span>: <span class="ident">syn</span>::<span class="ident">DeriveInput</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> <span class="ident">impl_</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">inner_ty</span>) <span class="op">=</span> <span class="ident">newtype_inner</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">data</span>) {
<span class="kw">let</span> <span class="ident">i128_fns</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">has_i128</span>) {
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">fn</span> <span class="ident">to_i128</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i128</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_i128</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_u128</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u128</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_u128</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
}
} <span class="kw">else</span> {
<span class="macro">quote</span><span class="macro">!</span> {}
};
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">fn</span> <span class="ident">to_i64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i64</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_i64</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_u64</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_isize</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">isize</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_isize</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_i8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i8</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_i8</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_i16</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i16</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_i16</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_i32</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_i32</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_usize</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_usize</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_u8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_u8</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_u16</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_u16</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_u32</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_u32</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_f32</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">f32</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_f32</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">to_f64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>::<span class="ident">to_f64</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
#<span class="ident">i128_fns</span>
}
}
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">variants</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">ast</span>.<span class="ident">data</span> {
<span class="ident">Data</span>::<span class="ident">Enum</span>(<span class="kw-2">ref</span> <span class="ident">data_enum</span>) <span class="op">=</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">data_enum</span>.<span class="ident">variants</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(
<span class="string">"`ToPrimitive` can be applied only to enums and newtypes, {} is neither"</span>,
<span class="ident">name</span>
),
};
<span class="kw">let</span> <span class="ident">variants</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">variants</span>
.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">variant</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">ident</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">ident</span>;
<span class="kw">match</span> <span class="ident">variant</span>.<span class="ident">fields</span> {
<span class="ident">Fields</span>::<span class="ident">Unit</span> <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"`ToPrimitive` can be applied only to unitary enums and newtypes, {}::{} is either struct or tuple"</span>, <span class="ident">name</span>, <span class="ident">ident</span>)
},
}
<span class="comment">// NB: We have to check each variant individually, because we'll only have `&self`</span>
<span class="comment">// for the input. We can't move from that, and it might not be `Clone` or `Copy`.</span>
<span class="comment">// (Otherwise we could just do `*self as i64` without a `match` at all.)</span>
<span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">name</span>::#<span class="ident">ident</span> <span class="op">=</span><span class="op">></span> #<span class="ident">name</span>::#<span class="ident">ident</span> <span class="kw">as</span> <span class="ident">i64</span>)
})
.<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">match_expr</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">variants</span>.<span class="ident">is_empty</span>() {
<span class="comment">// No variants found, so do not use Some to not to trigger `unreachable_code` lint</span>
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {}
}
} <span class="kw">else</span> {
<span class="macro">quote</span><span class="macro">!</span> {
<span class="prelude-val">Some</span>(<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
#(#<span class="ident">variants</span>,)<span class="op">*</span>
})
}
};
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">trivial_numeric_casts</span>)]</span>
<span class="kw">fn</span> <span class="ident">to_i64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i64</span><span class="op">></span> {
#<span class="ident">match_expr</span>
}
<span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">to_i64</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="kw">as</span> <span class="ident">u64</span>)
}
}
}
};
<span class="ident">dummy_const_trick</span>(<span class="string">"ToPrimitive"</span>, <span class="kw-2">&</span><span class="ident">name</span>, <span class="ident">impl_</span>).<span class="ident">into</span>()
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">renamed_and_removed_lints</span>)]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cargo-clippy"</span>, <span class="ident">allow</span>(<span class="ident">const_static_lifetime</span>))]</span>
<span class="kw">const</span> <span class="ident">NEWTYPE_ONLY</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> <span class="op">=</span> <span class="string">"This trait can only be derived for newtypes"</span>;
<span class="doccomment">/// Derives [`num_traits::NumOps`][num_ops] for newtypes. The inner type must already implement</span>
<span class="doccomment">/// `NumOps`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [num_ops]: https://docs.rs/num-traits/0.2/num_traits/trait.NumOps.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that, since `NumOps` is really a trait alias for `Add + Sub + Mul + Div + Rem`, this macro</span>
<span class="doccomment">/// generates impls for _those_ traits. Furthermore, in all generated impls, `RHS=Self` and</span>
<span class="doccomment">/// `Output=Self`.</span>
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">NumOps</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_ops</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">ast</span>: <span class="ident">syn</span>::<span class="ident">DeriveInput</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> <span class="ident">inner_ty</span> <span class="op">=</span> <span class="ident">newtype_inner</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">data</span>).<span class="ident">expect</span>(<span class="ident">NEWTYPE_ONLY</span>);
<span class="ident">dummy_const_trick</span>(
<span class="string">"NumOps"</span>,
<span class="kw-2">&</span><span class="ident">name</span>,
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Add</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Add</span><span class="op">></span>::<span class="ident">add</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
}
<span class="kw">impl</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Sub</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Sub</span><span class="op">></span>::<span class="ident">sub</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
}
<span class="kw">impl</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Mul</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">mul</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Mul</span><span class="op">></span>::<span class="ident">mul</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
}
<span class="kw">impl</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Div</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">div</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Div</span><span class="op">></span>::<span class="ident">div</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
}
<span class="kw">impl</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Rem</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">rem</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> ::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Rem</span><span class="op">></span>::<span class="ident">rem</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
}
},
)
.<span class="ident">into</span>()
}
<span class="doccomment">/// Derives [`num_traits::NumCast`][num_cast] for newtypes. The inner type must already implement</span>
<span class="doccomment">/// `NumCast`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [num_cast]: https://docs.rs/num-traits/0.2/num_traits/cast/trait.NumCast.html</span>
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">NumCast</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_cast</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">ast</span>: <span class="ident">syn</span>::<span class="ident">DeriveInput</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> <span class="ident">inner_ty</span> <span class="op">=</span> <span class="ident">newtype_inner</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">data</span>).<span class="ident">expect</span>(<span class="ident">NEWTYPE_ONLY</span>);
<span class="ident">dummy_const_trick</span>(
<span class="string">"NumCast"</span>,
<span class="kw-2">&</span><span class="ident">name</span>,
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">NumCast</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">fn</span> <span class="ident">from</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">_num_traits</span>::<span class="ident">ToPrimitive</span><span class="op">></span>(<span class="ident">n</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">NumCast</span><span class="op">></span>::<span class="ident">from</span>(<span class="ident">n</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
}
},
)
.<span class="ident">into</span>()
}
<span class="doccomment">/// Derives [`num_traits::Zero`][zero] for newtypes. The inner type must already implement `Zero`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [zero]: https://docs.rs/num-traits/0.2/num_traits/identities/trait.Zero.html</span>
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">Zero</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">zero</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">ast</span>: <span class="ident">syn</span>::<span class="ident">DeriveInput</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> <span class="ident">inner_ty</span> <span class="op">=</span> <span class="ident">newtype_inner</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">data</span>).<span class="ident">expect</span>(<span class="ident">NEWTYPE_ONLY</span>);
<span class="ident">dummy_const_trick</span>(
<span class="string">"Zero"</span>,
<span class="kw-2">&</span><span class="ident">name</span>,
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">Zero</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">fn</span> <span class="ident">zero</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Zero</span><span class="op">></span>::<span class="ident">zero</span>())
}
<span class="kw">fn</span> <span class="ident">is_zero</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Zero</span><span class="op">></span>::<span class="ident">is_zero</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
}
},
)
.<span class="ident">into</span>()
}
<span class="doccomment">/// Derives [`num_traits::One`][one] for newtypes. The inner type must already implement `One`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [one]: https://docs.rs/num-traits/0.2/num_traits/identities/trait.One.html</span>
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">One</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">one</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">ast</span>: <span class="ident">syn</span>::<span class="ident">DeriveInput</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> <span class="ident">inner_ty</span> <span class="op">=</span> <span class="ident">newtype_inner</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">data</span>).<span class="ident">expect</span>(<span class="ident">NEWTYPE_ONLY</span>);
<span class="ident">dummy_const_trick</span>(
<span class="string">"One"</span>,
<span class="kw-2">&</span><span class="ident">name</span>,
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">One</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">fn</span> <span class="ident">one</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">One</span><span class="op">></span>::<span class="ident">one</span>())
}
<span class="kw">fn</span> <span class="ident">is_one</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">One</span><span class="op">></span>::<span class="ident">is_one</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
}
},
)
.<span class="ident">into</span>()
}
<span class="doccomment">/// Derives [`num_traits::Num`][num] for newtypes. The inner type must already implement `Num`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [num]: https://docs.rs/num-traits/0.2/num_traits/trait.Num.html</span>
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">Num</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">ast</span>: <span class="ident">syn</span>::<span class="ident">DeriveInput</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> <span class="ident">inner_ty</span> <span class="op">=</span> <span class="ident">newtype_inner</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">data</span>).<span class="ident">expect</span>(<span class="ident">NEWTYPE_ONLY</span>);
<span class="ident">dummy_const_trick</span>(
<span class="string">"Num"</span>,
<span class="kw-2">&</span><span class="ident">name</span>,
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">Num</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">type</span> <span class="ident">FromStrRadixErr</span> <span class="op">=</span> <span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Num</span><span class="op">></span>::<span class="ident">FromStrRadixErr</span>;
<span class="kw">fn</span> <span class="ident">from_str_radix</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">radix</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="self">Self</span>::<span class="ident">FromStrRadixErr</span><span class="op">></span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Num</span><span class="op">></span>::<span class="ident">from_str_radix</span>(<span class="ident">s</span>, <span class="ident">radix</span>).<span class="ident">map</span>(#<span class="ident">name</span>)
}
}
},
)
.<span class="ident">into</span>()
}
<span class="doccomment">/// Derives [`num_traits::Float`][float] for newtypes. The inner type must already implement</span>
<span class="doccomment">/// `Float`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [float]: https://docs.rs/num-traits/0.2/num_traits/float/trait.Float.html</span>
<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">Float</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">float</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">ast</span>: <span class="ident">syn</span>::<span class="ident">DeriveInput</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> <span class="ident">inner_ty</span> <span class="op">=</span> <span class="ident">newtype_inner</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">data</span>).<span class="ident">expect</span>(<span class="ident">NEWTYPE_ONLY</span>);
<span class="ident">dummy_const_trick</span>(
<span class="string">"Float"</span>,
<span class="kw-2">&</span><span class="ident">name</span>,
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span> <span class="kw">for</span> #<span class="ident">name</span> {
<span class="kw">fn</span> <span class="ident">nan</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">nan</span>())
}
<span class="kw">fn</span> <span class="ident">infinity</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">infinity</span>())
}
<span class="kw">fn</span> <span class="ident">neg_infinity</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">neg_infinity</span>())
}
<span class="kw">fn</span> <span class="ident">neg_zero</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">neg_zero</span>())
}
<span class="kw">fn</span> <span class="ident">min_value</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">min_value</span>())
}
<span class="kw">fn</span> <span class="ident">min_positive_value</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">min_positive_value</span>())
}
<span class="kw">fn</span> <span class="ident">max_value</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">max_value</span>())
}
<span class="kw">fn</span> <span class="ident">is_nan</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">is_nan</span>(<span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">is_infinite</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">is_infinite</span>(<span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">is_finite</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">is_finite</span>(<span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">is_normal</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">is_normal</span>(<span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">classify</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> ::<span class="ident">std</span>::<span class="ident">num</span>::<span class="ident">FpCategory</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">classify</span>(<span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">floor</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">floor</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">ceil</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">ceil</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">round</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">round</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">trunc</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">trunc</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">fract</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">fract</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">abs</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">abs</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">signum</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">signum</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">is_sign_positive</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">is_sign_positive</span>(<span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">is_sign_negative</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">is_sign_negative</span>(<span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">mul_add</span>(<span class="self">self</span>, <span class="ident">a</span>: <span class="self">Self</span>, <span class="ident">b</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">mul_add</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">a</span>.<span class="number">0</span>, <span class="ident">b</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">recip</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">recip</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">powi</span>(<span class="self">self</span>, <span class="ident">n</span>: <span class="ident">i32</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">powi</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">n</span>))
}
<span class="kw">fn</span> <span class="ident">powf</span>(<span class="self">self</span>, <span class="ident">n</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">powf</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">n</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">sqrt</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">sqrt</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">exp</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">exp</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">exp2</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">exp2</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">ln</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">ln</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">log</span>(<span class="self">self</span>, <span class="ident">base</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">log</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">base</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">log2</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">log2</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">log10</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">log10</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">max</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">max</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">min</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">abs_sub</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">abs_sub</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">cbrt</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">cbrt</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">hypot</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">hypot</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">sin</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">sin</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">cos</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">cos</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">tan</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">tan</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">asin</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">asin</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">acos</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">acos</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">atan</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">atan</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">atan2</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">atan2</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">other</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">sin_cos</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="self">Self</span>, <span class="self">Self</span>) {
<span class="kw">let</span> (<span class="ident">x</span>, <span class="ident">y</span>) <span class="op">=</span> <span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">sin_cos</span>(<span class="self">self</span>.<span class="number">0</span>);
(#<span class="ident">name</span>(<span class="ident">x</span>), #<span class="ident">name</span>(<span class="ident">y</span>))
}
<span class="kw">fn</span> <span class="ident">exp_m1</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">exp_m1</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">ln_1p</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">ln_1p</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">sinh</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">sinh</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">cosh</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">cosh</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">tanh</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">tanh</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">asinh</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">asinh</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">acosh</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">acosh</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">atanh</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">atanh</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">integer_decode</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">u64</span>, <span class="ident">i16</span>, <span class="ident">i8</span>) {
<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">integer_decode</span>(<span class="self">self</span>.<span class="number">0</span>)
}
<span class="kw">fn</span> <span class="ident">epsilon</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">epsilon</span>())
}
<span class="kw">fn</span> <span class="ident">to_degrees</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">to_degrees</span>(<span class="self">self</span>.<span class="number">0</span>))
}
<span class="kw">fn</span> <span class="ident">to_radians</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
#<span class="ident">name</span>(<span class="op"><</span>#<span class="ident">inner_ty</span> <span class="kw">as</span> <span class="ident">_num_traits</span>::<span class="ident">Float</span><span class="op">></span>::<span class="ident">to_radians</span>(<span class="self">self</span>.<span class="number">0</span>))
}
}
},
)
.<span class="ident">into</span>()
}
</pre></div>
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