// Copyright 2012 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.

#[forbid(deprecated_mode)];
/// Additional general-purpose comparison functionality.

use core::f32;
use core::f64;
use core::float;

const fuzzy_epsilon: float = 1.0e-6;

pub trait FuzzyEq {
    pure fn fuzzy_eq(other: &self) -> bool;
}

impl float: FuzzyEq {
    pure fn fuzzy_eq(other: &float) -> bool {
        return float::abs(self - *other) < fuzzy_epsilon;
    }
}

impl f32: FuzzyEq {
    pure fn fuzzy_eq(other: &f32) -> bool {
        return f32::abs(self - *other) < (fuzzy_epsilon as f32);
    }
}

impl f64: FuzzyEq {
    pure fn fuzzy_eq(other: &f64) -> bool {
        return f64::abs(self - *other) < (fuzzy_epsilon as f64);
    }
}

#[test]
fn test_fuzzy_equals() {
    assert ((&1.0).fuzzy_eq(&1.0));
    assert ((&1.0f32).fuzzy_eq(&1.0f32));
    assert ((&1.0f64).fuzzy_eq(&1.0f64));
}