103 lines
2.8 KiB
Rust
103 lines
2.8 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the
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// COPYRIGHT 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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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Additional general-purpose comparison functionality.
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use core::f32;
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use core::f64;
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use core::float;
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pub const FUZZY_EPSILON: float = 1.0e-6;
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pub trait FuzzyEq<Eps> {
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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: &Eps) -> bool;
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}
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impl float: FuzzyEq<float> {
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pure fn fuzzy_eq(&self, other: &float) -> bool {
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self.fuzzy_eq_eps(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<f32> {
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pure fn fuzzy_eq(&self, other: &f32) -> bool {
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self.fuzzy_eq_eps(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<f64> {
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pure fn fuzzy_eq(&self, other: &f64) -> bool {
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self.fuzzy_eq_eps(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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fn test_fuzzy_equals() {
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assert (&1.0f).fuzzy_eq(&1.0);
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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 (&1.2f).fuzzy_eq_eps(&0.9, &0.5);
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assert !(&1.5f).fuzzy_eq_eps(&0.9, &0.5);
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}
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#[test]
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mod test_complex{
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use cmp::*;
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struct Complex { r: float, i: float }
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impl Complex: FuzzyEq<float> {
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pure fn fuzzy_eq(&self, other: &Complex) -> bool {
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self.fuzzy_eq_eps(other, &FUZZY_EPSILON)
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}
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pure fn fuzzy_eq_eps(&self, other: &Complex,
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epsilon: &float) -> bool {
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self.r.fuzzy_eq_eps(&other.r, epsilon) &&
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self.i.fuzzy_eq_eps(&other.i, epsilon)
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}
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}
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#[test]
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fn test_fuzzy_equals() {
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let a = Complex {r: 0.9, i: 0.9};
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let b = Complex {r: 0.9, i: 0.9};
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assert (a.fuzzy_eq(&b));
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}
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#[test]
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fn test_fuzzy_eq_eps() {
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let other = Complex {r: 0.9, i: 0.9};
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assert (&Complex {r: 0.9, i: 1.2}).fuzzy_eq_eps(&other, &0.5);
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assert (&Complex {r: 1.2, i: 0.9}).fuzzy_eq_eps(&other, &0.5);
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assert !(&Complex {r: 0.9, i: 1.5}).fuzzy_eq_eps(&other, &0.5);
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assert !(&Complex {r: 1.5, i: 0.9}).fuzzy_eq_eps(&other, &0.5);
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}
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}
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