| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/static_assertions-1.1.0/src/assert_type.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>assert_type.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../static_assertions/index.html"><div class="logo-container"> |
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| <img src="https://raw.githubusercontent.com/nvzqz/static-assertions-rs/assets/Icon.png" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">/// Asserts that _all_ types in a list are equal to each other. |
| /// |
| /// # Examples |
| /// |
| /// Often times, type aliases are used to express usage semantics via naming. In |
| /// some cases, the underlying type may differ based on platform. However, other |
| /// types like [`c_float`] will always alias the same type. |
| /// |
| /// ``` |
| /// # #[macro_use] extern crate static_assertions; fn main() {} |
| /// use std::os::raw::c_float; |
| /// |
| /// assert_type_eq_all!(c_float, f32); |
| /// ``` |
| /// |
| /// This macro can also be used to compare types that involve lifetimes! Just |
| /// use `'static` in that case: |
| /// |
| /// ``` |
| /// # #[macro_use] extern crate static_assertions; |
| /// # fn main() { |
| /// type Buf<'a> = &'a [u8]; |
| /// |
| /// assert_type_eq_all!(Buf<'static>, &'static [u8]); |
| /// # } |
| /// ``` |
| /// |
| /// The following example fails to compile because `String` and `str` do not |
| /// refer to the same type: |
| /// |
| /// ```compile_fail |
| /// # #[macro_use] extern crate static_assertions; fn main() {} |
| /// assert_type_eq_all!(String, str); |
| /// ``` |
| /// |
| /// This should also work the other way around, regardless of [`Deref`] |
| /// implementations. |
| /// |
| /// ```compile_fail |
| /// # #[macro_use] extern crate static_assertions; fn main() {} |
| /// assert_type_eq_all!(str, String); |
| /// ``` |
| /// |
| /// [`c_float`]: https://doc.rust-lang.org/std/os/raw/type.c_float.html |
| /// [`Deref`]: https://doc.rust-lang.org/std/ops/trait.Deref.html |
| </span><span class="attribute">#[macro_export] |
| </span><span class="macro">macro_rules! </span>assert_type_eq_all { |
| (<span class="macro-nonterminal">$x</span>:ty, $(<span class="macro-nonterminal">$xs</span>:ty),+ $(,)<span class="kw-2">*</span>) => { |
| <span class="kw">const _</span>: <span class="kw">fn</span>() = || { $({ |
| <span class="kw">trait </span>TypeEq { |
| <span class="kw">type </span>This: <span class="question-mark">?</span>Sized; |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> TypeEq <span class="kw">for </span>T { |
| <span class="kw">type </span>This = <span class="self">Self</span>; |
| } |
| |
| <span class="kw">fn </span>assert_type_eq_all<T, U>() |
| <span class="kw">where |
| </span>T: <span class="question-mark">?</span>Sized + TypeEq<This = U>, |
| U: <span class="question-mark">?</span>Sized, |
| {} |
| |
| assert_type_eq_all::<<span class="macro-nonterminal">$x</span>, <span class="macro-nonterminal">$xs</span>>(); |
| })+ }; |
| }; |
| } |
| |
| <span class="doccomment">/// Asserts that _all_ types are **not** equal to each other. |
| /// |
| /// # Examples |
| /// |
| /// Rust has all sorts of slices, but they represent different types of data: |
| /// |
| /// ``` |
| /// # #[macro_use] extern crate static_assertions; fn main() {} |
| /// assert_type_ne_all!([u8], [u16], str); |
| /// ``` |
| /// |
| /// The following example fails to compile because [`c_uchar`] is a type alias |
| /// for [`u8`]: |
| /// |
| /// ```compile_fail |
| /// # #[macro_use] extern crate static_assertions; fn main() {} |
| /// use std::os::raw::c_uchar; |
| /// |
| /// assert_type_ne_all!(c_uchar, u8, u32); |
| /// ``` |
| /// |
| /// [`c_uchar`]: https://doc.rust-lang.org/std/os/raw/type.c_uchar.html |
| /// [`u8`]: https://doc.rust-lang.org/std/primitive.u8.html |
| </span><span class="attribute">#[macro_export] |
| </span><span class="macro">macro_rules! </span>assert_type_ne_all { |
| (<span class="macro-nonterminal">$x</span>:ty, $(<span class="macro-nonterminal">$y</span>:ty),+ $(,)<span class="question-mark">?</span>) => { |
| <span class="kw">const _</span>: <span class="kw">fn</span>() = || { |
| <span class="kw">trait </span>MutuallyExclusive {} |
| <span class="kw">impl </span>MutuallyExclusive <span class="kw">for </span><span class="macro-nonterminal">$x </span>{} |
| $(<span class="kw">impl </span>MutuallyExclusive <span class="kw">for </span><span class="macro-nonterminal">$y </span>{})+ |
| }; |
| }; |
| } |
| </code></pre></div> |
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