| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Test for issue #4183: use of Self in supertraits. |
| |
| pub static FUZZY_EPSILON: f64 = 0.1; |
| |
| pub trait FuzzyEq<Eps> { |
| fn fuzzy_eq(&self, other: &Self) -> bool; |
| fn fuzzy_eq_eps(&self, other: &Self, epsilon: &Eps) -> bool; |
| } |
| |
| trait Float: Sized+FuzzyEq<Self> { |
| fn two_pi() -> Self; |
| } |
| |
| impl FuzzyEq<f32> for f32 { |
| fn fuzzy_eq(&self, other: &f32) -> bool { |
| self.fuzzy_eq_eps(other, &(FUZZY_EPSILON as f32)) |
| } |
| |
| fn fuzzy_eq_eps(&self, other: &f32, epsilon: &f32) -> bool { |
| (*self - *other).abs() < *epsilon |
| } |
| } |
| |
| impl Float for f32 { |
| fn two_pi() -> f32 { 6.28318530717958647692528676655900576_f32 } |
| } |
| |
| impl FuzzyEq<f64> for f64 { |
| fn fuzzy_eq(&self, other: &f64) -> bool { |
| self.fuzzy_eq_eps(other, &(FUZZY_EPSILON as f64)) |
| } |
| |
| fn fuzzy_eq_eps(&self, other: &f64, epsilon: &f64) -> bool { |
| (*self - *other).abs() < *epsilon |
| } |
| } |
| |
| impl Float for f64 { |
| fn two_pi() -> f64 { 6.28318530717958647692528676655900576_f64 } |
| } |
| |
| fn compare<F:Float>(f1: F) -> bool { |
| let f2 = Float::two_pi(); |
| f1.fuzzy_eq(&f2) |
| } |
| |
| pub fn main() { |
| assert!(compare::<f32>(6.28318530717958647692528676655900576)); |
| assert!(compare::<f32>(6.29)); |
| assert!(compare::<f32>(6.3)); |
| assert!(compare::<f32>(6.19)); |
| assert!(!compare::<f32>(7.28318530717958647692528676655900576)); |
| assert!(!compare::<f32>(6.18)); |
| |
| assert!(compare::<f64>(6.28318530717958647692528676655900576)); |
| assert!(compare::<f64>(6.29)); |
| assert!(compare::<f64>(6.3)); |
| assert!(compare::<f64>(6.19)); |
| assert!(!compare::<f64>(7.28318530717958647692528676655900576)); |
| assert!(!compare::<f64>(6.18)); |
| } |