forked from catchorg/Catch2
137 lines
4.8 KiB
C++
137 lines
4.8 KiB
C++
/*
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* Created by Phil on 28/04/2011.
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* Copyright 2010 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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#ifndef TWOBLUECUBES_CATCH_APPROX_HPP_INCLUDED
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#define TWOBLUECUBES_CATCH_APPROX_HPP_INCLUDED
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#include "catch_tostring.h"
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#include <cmath>
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#include <limits>
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#include <type_traits>
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namespace Catch {
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namespace Detail {
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class Approx {
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public:
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explicit 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( 1.0 ),
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m_value( value )
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{}
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Approx( Approx const& other ) = default;
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static Approx custom() {
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return Approx( 0 );
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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Approx operator()( T value ) {
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Approx approx( static_cast<double>(value) );
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approx.epsilon( m_epsilon );
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approx.margin( m_margin );
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approx.scale( m_scale );
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return approx;
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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explicit Approx( T value ): Approx(static_cast<double>(value))
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{}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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friend bool operator == ( const T& lhs, Approx const& rhs ) {
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// Thanks to Richard Harris for his help refining this formula
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auto lhs_v = double(lhs);
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bool relativeOK = std::fabs(lhs_v - rhs.m_value) < rhs.m_epsilon * (rhs.m_scale + (std::max)(std::fabs(lhs_v), std::fabs(rhs.m_value)));
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if (relativeOK) {
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return true;
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}
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return std::fabs(lhs_v - rhs.m_value) < rhs.m_margin;
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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friend bool operator == ( Approx const& lhs, const T& rhs ) {
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return operator==( rhs, lhs );
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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friend bool operator != ( T lhs, Approx const& rhs ) {
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return !operator==( lhs, rhs );
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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friend bool operator != ( Approx const& lhs, T rhs ) {
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return !operator==( rhs, lhs );
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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friend bool operator <= ( T lhs, Approx const& rhs ) {
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return double(lhs) < rhs.m_value || lhs == rhs;
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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friend bool operator <= ( Approx const& lhs, T rhs ) {
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return lhs.m_value < double(rhs) || lhs == rhs;
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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friend bool operator >= ( T lhs, Approx const& rhs ) {
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return double(lhs) > rhs.m_value || lhs == rhs;
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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friend bool operator >= ( Approx const& lhs, T rhs ) {
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return lhs.m_value > double(rhs) || lhs == rhs;
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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Approx& epsilon( T newEpsilon ) {
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m_epsilon = double(newEpsilon);
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return *this;
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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Approx& margin( T newMargin ) {
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m_margin = double(newMargin);
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return *this;
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}
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template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
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Approx& scale( T newScale ) {
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m_scale = double(newScale);
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return *this;
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}
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std::string toString() const {
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std::ostringstream oss;
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oss << "Approx( " << Catch::toString( m_value ) << " )";
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return oss.str();
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}
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private:
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double m_epsilon;
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double m_margin;
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double m_scale;
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double m_value;
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};
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}
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template<>
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inline std::string toString<Detail::Approx>( 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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#endif // TWOBLUECUBES_CATCH_APPROX_HPP_INCLUDED
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