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// run-pass
// 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));
}
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