ProteoWizard
almost_equal.hpp
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1//
2// $Id$
3//
4//
5// Original author: Darren Kessner <darren@proteowizard.org>
6//
7// Copyright 2009 Center for Applied Molecular Medicine
8// University of Southern California, Los Angeles, California
9//
10// Licensed under the Apache License, Version 2.0 (the "License");
11// you may not use this file except in compliance with the License.
12// You may obtain a copy of the License at
13//
14// http://www.apache.org/licenses/LICENSE-2.0
15//
16// Unless required by applicable law or agreed to in writing, software
17// distributed under the License is distributed on an "AS IS" BASIS,
18// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19// See the License for the specific language governing permissions and
20// limitations under the License.
21//
22
23
24#ifndef _ALMOST_EQUAL_HPP_
25#define _ALMOST_EQUAL_HPP_
26
27
28#include <limits>
29#include <cmath>
30
31
32namespace pwiz {
33namespace util {
34
35
36template <typename float_type>
37bool almost_equal(float_type a, float_type b, int multiplier = 1)
38{
39 float_type scale = a==float_type(0.0) ? float_type(1.0) : a;
40 return std::abs((a-b)/scale) < float_type(multiplier) * std::numeric_limits<float_type>::epsilon();
41}
42
43
44} // namespace util
45} // namespace pwiz
46
47
48#endif // _ALMOST_EQUAL_HPP_
49
50
bool almost_equal(float_type a, float_type b, int multiplier=1)