72 lines
2.3 KiB
Rust
72 lines
2.3 KiB
Rust
// Copyright 2014 The CGMath Developers. For a full listing of the authors,
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// refer to the Cargo.toml file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::num;
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use std::num::Float;
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pub trait ApproxEq<T: Float>: Sized {
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fn approx_epsilon(_hack: Option<Self>) -> T {
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num::cast(1.0e-5f64).unwrap()
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}
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fn approx_eq(&self, other: &Self) -> bool {
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let eps: T = ApproxEq::approx_epsilon(None::<Self>);
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self.approx_eq_eps(other, &eps)
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}
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fn approx_eq_eps(&self, other: &Self, epsilon: &T) -> bool;
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}
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macro_rules! approx_float(
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($S:ident) => (
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impl ApproxEq<$S> for $S {
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#[inline]
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fn approx_eq_eps(&self, other: &$S, epsilon: &$S) -> bool {
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(*self - *other).abs() < *epsilon
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}
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}
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)
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);
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approx_float!(f32);
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approx_float!(f64);
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#[macro_export]
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macro_rules! assert_approx_eq_eps(
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($given: expr, $expected: expr, $eps: expr) => ({
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let eps = &($eps);
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let (given_val, expected_val) = (&($given), &($expected));
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if !given_val.approx_eq_eps(expected_val, eps) {
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panic!("assertion failed: `left ≈ right` (left: `{:?}`, right: `{:?}`, tolerance: `{:?}`)",
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*given_val, *expected_val, *eps
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);
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}
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})
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);
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#[macro_export]
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macro_rules! assert_approx_eq(
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($given: expr, $expected: expr) => ({
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let (given_val, expected_val) = (&($given), &($expected));
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if !given_val.approx_eq(expected_val) {
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panic!("assertion failed: `left ≈ right` (left: `{:?}`, right: `{:?}`, tolerance: `{:?}`)",
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*given_val, *expected_val,
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ApproxEq::approx_epsilon(Some(*given_val))
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);
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}
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})
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);
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