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57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
/*
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* Created by Martin on 19/07/2017.
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* Copyright 2017 Two Blue Cubes Ltd. All rights reserved.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#include "catch_approx.h"
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#include <cmath>
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#include <limits>
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namespace {
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// Performs equivalent check of std::fabs(lhs - rhs) <= margin
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// But without the subtraction to allow for INFINITY in comparison
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bool marginComparison(double lhs, double rhs, double margin) {
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return (lhs + margin >= rhs) && (rhs + margin >= lhs);
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}
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}
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namespace Catch {
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namespace Detail {
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Approx::Approx ( double value )
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: m_epsilon( std::numeric_limits<float>::epsilon()*100 ),
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m_margin( 0.0 ),
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m_scale( 0.0 ),
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m_value( value )
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{}
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Approx Approx::custom() {
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return Approx( 0 );
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}
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std::string Approx::toString() const {
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std::ostringstream oss;
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oss << "Approx( " << ::Catch::Detail::stringify( m_value ) << " )";
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return oss.str();
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}
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bool Approx::equalityComparisonImpl(const double other) const {
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// First try with fixed margin, then compute margin based on epsilon, scale and Approx's value
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// Thanks to Richard Harris for his help refining the scaled margin value
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return marginComparison(m_value, other, m_margin) || marginComparison(m_value, other, m_epsilon * (m_scale + std::fabs(m_value)));
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}
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} // end namespace Detail
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std::string StringMaker<Catch::Detail::Approx>::convert(Catch::Detail::Approx const& value) {
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return value.toString();
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}
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} // end namespace Catch
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