| <!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/git/checkouts/rulinalg-309246e5a94bf5cf/1ed8b93/src/macros/assert_scalar_eq.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>assert_scalar_eq.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="../../../rulinalg/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="../../../rulinalg/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>std::fmt; |
| |
| <span class="kw">use </span>macros::ElementwiseComparator; |
| <span class="kw">use </span>macros::comparison::ComparisonFailure; |
| |
| |
| <span class="attribute">#[doc(hidden)] |
| #[derive(Debug, Copy, Clone, PartialEq)] |
| </span><span class="kw">pub struct </span>ScalarComparisonFailure<T, E> <span class="kw">where </span>E: ComparisonFailure { |
| <span class="kw">pub </span>x: T, |
| <span class="kw">pub </span>y: T, |
| <span class="kw">pub </span>error: E |
| } |
| |
| <span class="kw">impl</span><T, E> fmt::Display <span class="kw">for </span>ScalarComparisonFailure<T, E> |
| <span class="kw">where </span>T: fmt::Display, E: ComparisonFailure { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="macro">write!</span>(f, |
| <span class="string">"x = {x}, y = {y}.{reason}"</span>, |
| x = <span class="self">self</span>.x, |
| y = <span class="self">self</span>.y, |
| reason = <span class="self">self</span>.error.failure_reason() |
| <span class="comment">// Add a space before the reason |
| </span>.map(|s| <span class="macro">format!</span>(<span class="string">" {}"</span>, s)) |
| .unwrap_or(String::new())) |
| } |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[derive(Debug, PartialEq)] |
| </span><span class="kw">pub enum </span>ScalarComparisonResult<T, C, E> |
| <span class="kw">where </span>T: Copy, |
| C: ElementwiseComparator<T, E>, |
| E: ComparisonFailure |
| { |
| Match, |
| Mismatch { |
| comparator: C, |
| mismatch: ScalarComparisonFailure<T, E> |
| } |
| } |
| |
| <span class="kw">impl </span><T, C, E> ScalarComparisonResult<T, C, E> |
| <span class="kw">where </span>T: Copy + fmt::Display, C: ElementwiseComparator<T, E>, E: ComparisonFailure { |
| <span class="kw">pub fn </span>panic_message(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><String> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="kw-2">&</span>ScalarComparisonResult::Mismatch { <span class="kw-2">ref </span>comparator, <span class="kw-2">ref </span>mismatch } => { |
| <span class="prelude-val">Some</span>(<span class="macro">format!</span>(<span class="string">"\n |
| Scalars x and y do not compare equal. |
| |
| {mismatch} |
| |
| Comparison criterion: {description} |
| \n"</span>, |
| description = comparator.description(), |
| mismatch = mismatch.to_string() |
| )) |
| }, |
| <span class="kw">_ </span>=> <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>scalar_comparison<T, C, E>(x: T, y: T, comparator: C) |
| -> ScalarComparisonResult<T, C, E> |
| <span class="kw">where </span>T: Copy, |
| C: ElementwiseComparator<T, E>, |
| E: ComparisonFailure { |
| |
| <span class="kw">match </span>comparator.compare(x, y) { |
| <span class="prelude-val">Err</span>(error) => ScalarComparisonResult::Mismatch { |
| comparator: comparator, |
| mismatch: ScalarComparisonFailure { |
| x: x, |
| y: y, |
| error: error |
| } |
| }, |
| <span class="kw">_ </span>=> ScalarComparisonResult::Match |
| } |
| } |
| |
| <span class="doccomment">/// Compare scalars for exact or approximate equality. |
| /// |
| /// This macro works analogously to [assert_matrix_eq!](macro.assert_matrix_eq.html), |
| /// but is used for comparing scalars (e.g. integers, floating-point numbers) |
| /// rather than matrices. Please see the documentation for `assert_matrix_eq!` |
| /// for details about issues that arise when comparing floating-point numbers, |
| /// as well as an explanation for how these macros can be used to resolve |
| /// these issues. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # #[macro_use] extern crate rulinalg; fn main() { |
| /// let x = 3.00; |
| /// let y = 3.05; |
| /// // Assert that |x - y| <= 0.1 |
| /// assert_scalar_eq!(x, y, comp = abs, tol = 0.1); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[macro_export] |
| </span><span class="macro">macro_rules! </span>assert_scalar_eq { |
| (<span class="macro-nonterminal">$x</span>:expr, <span class="macro-nonterminal">$y</span>:expr) => { |
| { |
| <span class="kw">use </span><span class="macro-nonterminal">$crate::macros</span>::{scalar_comparison, ExactElementwiseComparator}; |
| <span class="kw">let </span>comp = ExactElementwiseComparator; |
| <span class="kw">let </span>msg = scalar_comparison(<span class="macro-nonterminal">$x</span>.clone(), <span class="macro-nonterminal">$y</span>.clone(), comp).panic_message(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(msg) = msg { |
| <span class="comment">// Note: We need the panic to incur here inside of the macro in order |
| // for the line number to be correct when using it for tests, |
| // hence we build the panic message in code, but panic here. |
| </span><span class="macro">panic!</span>(<span class="string">"{msg} |
| Please see the documentation for ways to compare scalars approximately.\n\n"</span>, |
| msg = msg.trim_right()); |
| } |
| } |
| }; |
| (<span class="macro-nonterminal">$x</span>:expr, <span class="macro-nonterminal">$y</span>:expr, comp = exact) => { |
| { |
| <span class="kw">use </span><span class="macro-nonterminal">$crate::macros</span>::{scalar_comparison, ExactElementwiseComparator}; |
| <span class="kw">let </span>comp = ExactElementwiseComparator; |
| <span class="kw">let </span>msg = scalar_comparison(<span class="macro-nonterminal">$x</span>.clone(), <span class="macro-nonterminal">$y</span>.clone(), comp).panic_message(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(msg) = msg { |
| <span class="macro">panic!</span>(msg); |
| } |
| } |
| }; |
| (<span class="macro-nonterminal">$x</span>:expr, <span class="macro-nonterminal">$y</span>:expr, comp = abs, tol = <span class="macro-nonterminal">$tol</span>:expr) => { |
| { |
| <span class="kw">use </span><span class="macro-nonterminal">$crate::macros</span>::{scalar_comparison, AbsoluteElementwiseComparator}; |
| <span class="kw">let </span>comp = AbsoluteElementwiseComparator { tol: <span class="macro-nonterminal">$tol </span>}; |
| <span class="kw">let </span>msg = scalar_comparison(<span class="macro-nonterminal">$x</span>.clone(), <span class="macro-nonterminal">$y</span>.clone(), comp).panic_message(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(msg) = msg { |
| <span class="macro">panic!</span>(msg); |
| } |
| } |
| }; |
| (<span class="macro-nonterminal">$x</span>:expr, <span class="macro-nonterminal">$y</span>:expr, comp = ulp, tol = <span class="macro-nonterminal">$tol</span>:expr) => { |
| { |
| <span class="kw">use </span><span class="macro-nonterminal">$crate::macros</span>::{scalar_comparison, UlpElementwiseComparator}; |
| <span class="kw">let </span>comp = UlpElementwiseComparator { tol: <span class="macro-nonterminal">$tol </span>}; |
| <span class="kw">let </span>msg = scalar_comparison(<span class="macro-nonterminal">$x</span>.clone(), <span class="macro-nonterminal">$y</span>.clone(), comp).panic_message(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(msg) = msg { |
| <span class="macro">panic!</span>(msg); |
| } |
| } |
| }; |
| (<span class="macro-nonterminal">$x</span>:expr, <span class="macro-nonterminal">$y</span>:expr, comp = float) => { |
| { |
| <span class="kw">use </span><span class="macro-nonterminal">$crate::macros</span>::{scalar_comparison, FloatElementwiseComparator}; |
| <span class="kw">let </span>comp = FloatElementwiseComparator::default(); |
| <span class="kw">let </span>msg = scalar_comparison(<span class="macro-nonterminal">$x</span>.clone(), <span class="macro-nonterminal">$y</span>.clone(), comp).panic_message(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(msg) = msg { |
| <span class="macro">panic!</span>(msg); |
| } |
| } |
| }; |
| <span class="comment">// The following allows us to optionally tweak the epsilon and ulp tolerances |
| // used in the default float comparator. |
| </span>(<span class="macro-nonterminal">$x</span>:expr, <span class="macro-nonterminal">$y</span>:expr, comp = float, $(<span class="macro-nonterminal">$key</span>:ident = <span class="macro-nonterminal">$val</span>:expr),+) => { |
| { |
| <span class="kw">use </span><span class="macro-nonterminal">$crate::macros</span>::{scalar_comparison, FloatElementwiseComparator}; |
| <span class="kw">let </span>comp = FloatElementwiseComparator::default()$(.<span class="macro-nonterminal">$key</span>(<span class="macro-nonterminal">$val</span>))+; |
| <span class="kw">let </span>msg = scalar_comparison(<span class="macro-nonterminal">$x</span>.clone(), <span class="macro-nonterminal">$y</span>.clone(), comp).panic_message(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(msg) = msg { |
| <span class="macro">panic!</span>(msg); |
| } |
| } |
| }; |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::scalar_comparison; |
| <span class="kw">use </span>macros::comparison::{ |
| ExactElementwiseComparator, ExactError |
| }; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>scalar_comparison_reports_correct_mismatch() { |
| <span class="kw">use </span><span class="kw">super</span>::ScalarComparisonResult::Mismatch; |
| <span class="kw">use </span><span class="kw">super</span>::ScalarComparisonFailure; |
| |
| <span class="kw">let </span>comp = ExactElementwiseComparator; |
| |
| { |
| <span class="kw">let </span>x = <span class="number">0.2</span>; |
| <span class="kw">let </span>y = <span class="number">0.3</span>; |
| |
| <span class="kw">let </span>expected = Mismatch { |
| comparator: comp, |
| mismatch: ScalarComparisonFailure { |
| x: <span class="number">0.2</span>, y: <span class="number">0.3</span>, |
| error: ExactError |
| } |
| }; |
| |
| <span class="macro">assert_eq!</span>(scalar_comparison(x, y, comp), expected); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_default_compare_self_for_integer() { |
| <span class="kw">let </span>x = <span class="number">2</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_default_compare_self_for_floating_point() { |
| <span class="kw">let </span>x = <span class="number">2.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic] |
| </span><span class="kw">pub fn </span>scalar_eq_default_mismatched_elements() { |
| <span class="kw">let </span>x = <span class="number">3</span>; |
| <span class="kw">let </span>y = <span class="number">4</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, y); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_exact_compare_self_for_integer() { |
| <span class="kw">let </span>x = <span class="number">2</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = exact); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_exact_compare_self_for_floating_point() { |
| <span class="kw">let </span>x = <span class="number">2.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = exact);; |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic] |
| </span><span class="kw">pub fn </span>scalar_eq_exact_mismatched_elements() { |
| <span class="kw">let </span>x = <span class="number">3</span>; |
| <span class="kw">let </span>y = <span class="number">4</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, y, comp = exact); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_abs_compare_self_for_integer() { |
| <span class="kw">let </span>x = <span class="number">2</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = abs, tol = <span class="number">1</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_abs_compare_self_for_floating_point() { |
| <span class="kw">let </span>x = <span class="number">2.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = abs, tol = <span class="number">1e-8</span>); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic] |
| </span><span class="kw">pub fn </span>scalar_eq_abs_mismatched_elements() { |
| <span class="kw">let </span>x = <span class="number">3.0</span>; |
| <span class="kw">let </span>y = <span class="number">4.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, y, comp = abs, tol = <span class="number">1e-8</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_ulp_compare_self() { |
| <span class="kw">let </span>x = <span class="number">2.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = ulp, tol = <span class="number">1</span>); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic] |
| </span><span class="kw">pub fn </span>scalar_eq_ulp_mismatched_elements() { |
| <span class="kw">let </span>x = <span class="number">3.0</span>; |
| <span class="kw">let </span>y = <span class="number">4.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, y, comp = ulp, tol = <span class="number">4</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_float_compare_self() { |
| <span class="kw">let </span>x = <span class="number">2.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = ulp, tol = <span class="number">1</span>); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic] |
| </span><span class="kw">pub fn </span>scalar_eq_float_mismatched_elements() { |
| <span class="kw">let </span>x = <span class="number">3.0</span>; |
| <span class="kw">let </span>y = <span class="number">4.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, y, comp = float); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_float_compare_self_with_eps() { |
| <span class="kw">let </span>x = <span class="number">2.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = float, eps = <span class="number">1e-6</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_float_compare_self_with_ulp() { |
| <span class="kw">let </span>x = <span class="number">2.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = float, ulp = <span class="number">12</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_float_compare_self_with_eps_and_ulp() { |
| <span class="kw">let </span>x = <span class="number">2.0</span>; |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = float, eps = <span class="number">1e-6</span>, ulp = <span class="number">12</span>); |
| <span class="macro">assert_scalar_eq!</span>(x, x, comp = float, ulp = <span class="number">12</span>, eps = <span class="number">1e-6</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>scalar_eq_pass_by_ref() |
| { |
| <span class="kw">let </span>x = <span class="number">0.0</span>; |
| |
| <span class="comment">// Exercise all the macro definitions and make sure that we are able to call it |
| // when the arguments are references. |
| </span><span class="macro">assert_scalar_eq!</span>(<span class="kw-2">&</span>x, <span class="kw-2">&</span>x); |
| <span class="macro">assert_scalar_eq!</span>(<span class="kw-2">&</span>x, <span class="kw-2">&</span>x, comp = exact); |
| <span class="macro">assert_scalar_eq!</span>(<span class="kw-2">&</span>x, <span class="kw-2">&</span>x, comp = abs, tol = <span class="number">0.0</span>); |
| <span class="macro">assert_scalar_eq!</span>(<span class="kw-2">&</span>x, <span class="kw-2">&</span>x, comp = ulp, tol = <span class="number">0</span>); |
| <span class="macro">assert_scalar_eq!</span>(<span class="kw-2">&</span>x, <span class="kw-2">&</span>x, comp = float); |
| <span class="macro">assert_scalar_eq!</span>(<span class="kw-2">&</span>x, <span class="kw-2">&</span>x, comp = float, eps = <span class="number">0.0</span>, ulp = <span class="number">0</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rulinalg" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |