89 lines
2.5 KiB
C++
89 lines
2.5 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 "catch_enforce.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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Approx Approx::operator-() const {
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auto temp(*this);
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temp.m_value = -temp.m_value;
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return temp;
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}
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std::string Approx::toString() const {
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ReusableStringStream rss;
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rss << "Approx( " << ::Catch::Detail::stringify( m_value ) << " )";
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return rss.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)
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|| marginComparison(m_value, other, m_epsilon * (m_scale + std::fabs(std::isinf(m_value)? 0 : m_value)));
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}
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void Approx::setMargin(double newMargin) {
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CATCH_ENFORCE(newMargin >= 0,
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"Invalid Approx::margin: " << newMargin << '.'
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<< " Approx::Margin has to be non-negative.");
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m_margin = newMargin;
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}
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void Approx::setEpsilon(double newEpsilon) {
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CATCH_ENFORCE(newEpsilon >= 0 && newEpsilon <= 1.0,
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"Invalid Approx::epsilon: " << newEpsilon << '.'
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<< " Approx::epsilon has to be in [0, 1]");
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m_epsilon = newEpsilon;
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}
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} // end namespace Detail
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namespace literals {
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Detail::Approx operator "" _a(long double val) {
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return Detail::Approx(val);
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}
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Detail::Approx operator "" _a(unsigned long long val) {
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return Detail::Approx(val);
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}
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} // end namespace literals
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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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