mirror of https://github.com/rust-lang/rust.git
add a FuzzyEq method that accepts an epsilon value
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@ -1,4 +1,4 @@
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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@ -19,24 +19,37 @@ const fuzzy_epsilon: float = 1.0e-6;
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pub trait FuzzyEq {
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pure fn fuzzy_eq(&self, other: &self) -> bool;
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pure fn fuzzy_eq_eps(&self, other: &self, epsilon: &self) -> bool;
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}
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impl float: FuzzyEq {
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pure fn fuzzy_eq(&self, other: &float) -> bool {
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float::abs(*self - *other) < fuzzy_epsilon
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}
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pure fn fuzzy_eq_eps(&self, other: &float, epsilon: &float) -> bool {
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float::abs(*self - *other) < *epsilon
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}
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}
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impl f32: FuzzyEq {
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pure fn fuzzy_eq(&self, other: &f32) -> bool {
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f32::abs(*self - *other) < (fuzzy_epsilon as f32)
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}
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pure fn fuzzy_eq_eps(&self, other: &f32, epsilon: &f32) -> bool {
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f32::abs(*self - *other) < *epsilon
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}
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}
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impl f64: FuzzyEq {
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pure fn fuzzy_eq(&self, other: &f64) -> bool {
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f64::abs(*self - *other) < (fuzzy_epsilon as f64)
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}
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pure fn fuzzy_eq_eps(&self, other: &f64, epsilon: &f64) -> bool {
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f64::abs(*self - *other) < *epsilon
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}
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}
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#[test]
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@ -45,3 +58,9 @@ fn test_fuzzy_equals() {
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assert (&1.0f32).fuzzy_eq(&1.0f32);
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assert (&1.0f64).fuzzy_eq(&1.0f64);
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}
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#[test]
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fn test_fuzzy_eq_eps() {
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assert (&1.2).fuzzy_eq_eps(&0.9, &0.5);
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assert !(&1.5).fuzzy_eq_eps(&0.9, &0.5);
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}
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