<!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/cgmath-0.17.0/src/conv.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>conv.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='../../cgmath/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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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Constrained conversion functions for assisting in situations where type</span>
<span class="doccomment">//! inference is difficult.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! For example, when declaring `glium` uniforms, we need to convert to fixed</span>
<span class="doccomment">//! length arrays. We can use the `Into` trait directly, but it is rather ugly!</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! #[macro_use]</span>
<span class="doccomment">//! extern crate glium;</span>
<span class="doccomment">//! extern crate cgmath;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! use cgmath::{Matrix4, Point2};</span>
<span class="doccomment">//! use cgmath::prelude::*;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn main() {</span>
<span class="doccomment">//! let point = Point2::new(1, 2);</span>
<span class="doccomment">//! let matrix = Matrix4::from_scale(2.0);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let uniforms = uniform! {</span>
<span class="doccomment">//! point: Into::<[_; 2]>::into(point),</span>
<span class="doccomment">//! matrix: Into::<[[_; 4]; 4]>::into(matrix),</span>
<span class="doccomment">//! // Yuck!! (ﾉಥ益ಥ）ﾉ ┻━┻</span>
<span class="doccomment">//! };</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Instead, we can use the conversion functions from the `conv` module:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! #[macro_use]</span>
<span class="doccomment">//! extern crate glium;</span>
<span class="doccomment">//! extern crate cgmath;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! use cgmath::{Matrix4, Point2};</span>
<span class="doccomment">//! use cgmath::prelude::*;</span>
<span class="doccomment">//! use cgmath::conv::*;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn main() {</span>
<span class="doccomment">//! let point = Point2::new(1, 2);</span>
<span class="doccomment">//! let matrix = Matrix4::from_scale(2.0);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let uniforms = uniform! {</span>
<span class="doccomment">//! point: array2(point),</span>
<span class="doccomment">//! matrix: array4x4(matrix),</span>
<span class="doccomment">//! // ┬─┬ノ( º _ ºノ)</span>
<span class="doccomment">//! };</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">/// Force a conversion into a 2-element array.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">array2</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span>: <span class="ident">Into</span><span class="op"><</span>[<span class="ident">T</span>; <span class="number">2</span>]<span class="op">></span><span class="op">></span>(<span class="ident">value</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> [<span class="ident">T</span>; <span class="number">2</span>] {
<span class="ident">value</span>.<span class="ident">into</span>()
}
<span class="doccomment">/// Force a conversion into a 3-element array.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">array3</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span>: <span class="ident">Into</span><span class="op"><</span>[<span class="ident">T</span>; <span class="number">3</span>]<span class="op">></span><span class="op">></span>(<span class="ident">value</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> [<span class="ident">T</span>; <span class="number">3</span>] {
<span class="ident">value</span>.<span class="ident">into</span>()
}
<span class="doccomment">/// Force a conversion into a 4-element array.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">array4</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span>: <span class="ident">Into</span><span class="op"><</span>[<span class="ident">T</span>; <span class="number">4</span>]<span class="op">></span><span class="op">></span>(<span class="ident">value</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> [<span class="ident">T</span>; <span class="number">4</span>] {
<span class="ident">value</span>.<span class="ident">into</span>()
}
<span class="doccomment">/// Force a conversion into a 2x2-element array.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">array2x2</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span>: <span class="ident">Into</span><span class="op"><</span>[[<span class="ident">T</span>; <span class="number">2</span>]; <span class="number">2</span>]<span class="op">></span><span class="op">></span>(<span class="ident">value</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> [[<span class="ident">T</span>; <span class="number">2</span>]; <span class="number">2</span>] {
<span class="ident">value</span>.<span class="ident">into</span>()
}
<span class="doccomment">/// Force a conversion into a 3x3-element array.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">array3x3</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span>: <span class="ident">Into</span><span class="op"><</span>[[<span class="ident">T</span>; <span class="number">3</span>]; <span class="number">3</span>]<span class="op">></span><span class="op">></span>(<span class="ident">value</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> [[<span class="ident">T</span>; <span class="number">3</span>]; <span class="number">3</span>] {
<span class="ident">value</span>.<span class="ident">into</span>()
}
<span class="doccomment">/// Force a conversion into a 4x4-element array.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">array4x4</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span>: <span class="ident">Into</span><span class="op"><</span>[[<span class="ident">T</span>; <span class="number">4</span>]; <span class="number">4</span>]<span class="op">></span><span class="op">></span>(<span class="ident">value</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> [[<span class="ident">T</span>; <span class="number">4</span>]; <span class="number">4</span>] {
<span class="ident">value</span>.<span class="ident">into</span>()
}
</pre></div>
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