| <!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/num-traits-0.2.15/src/bounds.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>bounds.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="../../num_traits/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../num_traits/index.html"><img class="rust-logo" src="../../rust-logo.svg" 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="kw">use </span>core::num::Wrapping; |
| <span class="kw">use </span>core::{f32, f64}; |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="kw">use </span>core::{i128, u128}; |
| <span class="kw">use </span>core::{i16, i32, i64, i8, isize}; |
| <span class="kw">use </span>core::{u16, u32, u64, u8, usize}; |
| |
| <span class="doccomment">/// Numbers which have upper and lower bounds |
| </span><span class="kw">pub trait </span>Bounded { |
| <span class="comment">// FIXME (#5527): These should be associated constants |
| </span><span class="doccomment">/// Returns the smallest finite number this type can represent |
| </span><span class="kw">fn </span>min_value() -> <span class="self">Self</span>; |
| <span class="doccomment">/// Returns the largest finite number this type can represent |
| </span><span class="kw">fn </span>max_value() -> <span class="self">Self</span>; |
| } |
| |
| <span class="doccomment">/// Numbers which have lower bounds |
| </span><span class="kw">pub trait </span>LowerBounded { |
| <span class="doccomment">/// Returns the smallest finite number this type can represent |
| </span><span class="kw">fn </span>min_value() -> <span class="self">Self</span>; |
| } |
| |
| <span class="comment">// FIXME: With a major version bump, this should be a supertrait instead |
| </span><span class="kw">impl</span><T: Bounded> LowerBounded <span class="kw">for </span>T { |
| <span class="kw">fn </span>min_value() -> T { |
| Bounded::min_value() |
| } |
| } |
| |
| <span class="doccomment">/// Numbers which have upper bounds |
| </span><span class="kw">pub trait </span>UpperBounded { |
| <span class="doccomment">/// Returns the largest finite number this type can represent |
| </span><span class="kw">fn </span>max_value() -> <span class="self">Self</span>; |
| } |
| |
| <span class="comment">// FIXME: With a major version bump, this should be a supertrait instead |
| </span><span class="kw">impl</span><T: Bounded> UpperBounded <span class="kw">for </span>T { |
| <span class="kw">fn </span>max_value() -> T { |
| Bounded::max_value() |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>bounded_impl { |
| (<span class="macro-nonterminal">$t</span>:ty, <span class="macro-nonterminal">$min</span>:expr, <span class="macro-nonterminal">$max</span>:expr) => { |
| <span class="kw">impl </span>Bounded <span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>min_value() -> <span class="macro-nonterminal">$t </span>{ |
| <span class="macro-nonterminal">$min |
| </span>} |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>max_value() -> <span class="macro-nonterminal">$t </span>{ |
| <span class="macro-nonterminal">$max |
| </span>} |
| } |
| }; |
| } |
| |
| <span class="macro">bounded_impl!</span>(usize, usize::MIN, usize::MAX); |
| <span class="macro">bounded_impl!</span>(u8, u8::MIN, u8::MAX); |
| <span class="macro">bounded_impl!</span>(u16, u16::MIN, u16::MAX); |
| <span class="macro">bounded_impl!</span>(u32, u32::MIN, u32::MAX); |
| <span class="macro">bounded_impl!</span>(u64, u64::MIN, u64::MAX); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">bounded_impl!</span>(u128, u128::MIN, u128::MAX); |
| |
| <span class="macro">bounded_impl!</span>(isize, isize::MIN, isize::MAX); |
| <span class="macro">bounded_impl!</span>(i8, i8::MIN, i8::MAX); |
| <span class="macro">bounded_impl!</span>(i16, i16::MIN, i16::MAX); |
| <span class="macro">bounded_impl!</span>(i32, i32::MIN, i32::MAX); |
| <span class="macro">bounded_impl!</span>(i64, i64::MIN, i64::MAX); |
| <span class="attribute">#[cfg(has_i128)] |
| </span><span class="macro">bounded_impl!</span>(i128, i128::MIN, i128::MAX); |
| |
| <span class="kw">impl</span><T: Bounded> Bounded <span class="kw">for </span>Wrapping<T> { |
| <span class="kw">fn </span>min_value() -> <span class="self">Self </span>{ |
| Wrapping(T::min_value()) |
| } |
| <span class="kw">fn </span>max_value() -> <span class="self">Self </span>{ |
| Wrapping(T::max_value()) |
| } |
| } |
| |
| <span class="macro">bounded_impl!</span>(f32, f32::MIN, f32::MAX); |
| |
| <span class="macro">macro_rules! </span>for_each_tuple_ { |
| ( <span class="macro-nonterminal">$m</span>:ident !! ) => ( |
| <span class="macro-nonterminal">$</span><span class="macro">m! </span>{ } |
| ); |
| ( <span class="macro-nonterminal">$m</span>:ident !! <span class="macro-nonterminal">$h</span>:ident, $(<span class="macro-nonterminal">$t</span>:ident,)* ) => ( |
| <span class="macro-nonterminal">$</span><span class="macro">m! </span>{ <span class="macro-nonterminal">$h </span>$(<span class="macro-nonterminal">$t</span>)* } |
| <span class="macro">for_each_tuple_! </span>{ <span class="macro-nonterminal">$m </span>!! $(<span class="macro-nonterminal">$t</span>,)* } |
| ); |
| } |
| <span class="macro">macro_rules! </span>for_each_tuple { |
| (<span class="macro-nonterminal">$m</span>:ident) => { |
| <span class="macro">for_each_tuple_! </span>{ <span class="macro-nonterminal">$m </span>!! A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, } |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>bounded_tuple { |
| ( $(<span class="macro-nonterminal">$name</span>:ident)* ) => ( |
| <span class="kw">impl</span><$(<span class="macro-nonterminal">$name</span>: Bounded,)<span class="kw-2">*</span>> Bounded <span class="kw">for </span>($(<span class="macro-nonterminal">$name</span>,)<span class="kw-2">*</span>) { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>min_value() -> <span class="self">Self </span>{ |
| ($(<span class="macro-nonterminal">$name::min_value</span>(),)<span class="kw-2">*</span>) |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>max_value() -> <span class="self">Self </span>{ |
| ($(<span class="macro-nonterminal">$name::max_value</span>(),)<span class="kw-2">*</span>) |
| } |
| } |
| ); |
| } |
| |
| <span class="macro">for_each_tuple!</span>(bounded_tuple); |
| <span class="macro">bounded_impl!</span>(f64, f64::MIN, f64::MAX); |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>wrapping_bounded() { |
| <span class="macro">macro_rules! </span>test_wrapping_bounded { |
| ($(<span class="macro-nonterminal">$t</span>:ty)+) => { |
| $( |
| <span class="macro">assert_eq!</span>(<Wrapping<<span class="macro-nonterminal">$t</span>> <span class="kw">as </span>Bounded>::min_value().<span class="number">0</span>, <<span class="macro-nonterminal">$t</span>>::min_value()); |
| <span class="macro">assert_eq!</span>(<Wrapping<<span class="macro-nonterminal">$t</span>> <span class="kw">as </span>Bounded>::max_value().<span class="number">0</span>, <<span class="macro-nonterminal">$t</span>>::max_value()); |
| )+ |
| }; |
| } |
| |
| <span class="macro">test_wrapping_bounded!</span>(usize u8 u16 u32 u64 isize i8 i16 i32 i64); |
| } |
| |
| <span class="attribute">#[cfg(has_i128)] |
| #[test] |
| </span><span class="kw">fn </span>wrapping_bounded_i128() { |
| <span class="macro">macro_rules! </span>test_wrapping_bounded { |
| ($(<span class="macro-nonterminal">$t</span>:ty)+) => { |
| $( |
| <span class="macro">assert_eq!</span>(<Wrapping<<span class="macro-nonterminal">$t</span>> <span class="kw">as </span>Bounded>::min_value().<span class="number">0</span>, <<span class="macro-nonterminal">$t</span>>::min_value()); |
| <span class="macro">assert_eq!</span>(<Wrapping<<span class="macro-nonterminal">$t</span>> <span class="kw">as </span>Bounded>::max_value().<span class="number">0</span>, <<span class="macro-nonterminal">$t</span>>::max_value()); |
| )+ |
| }; |
| } |
| |
| <span class="macro">test_wrapping_bounded!</span>(u128 i128); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>wrapping_is_bounded() { |
| <span class="kw">fn </span>require_bounded<T: Bounded>(<span class="kw">_</span>: <span class="kw-2">&</span>T) {} |
| require_bounded(<span class="kw-2">&</span>Wrapping(<span class="number">42_u32</span>)); |
| require_bounded(<span class="kw-2">&</span>Wrapping(-<span class="number">42</span>)); |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="num_traits" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |