133 lines
4.9 KiB
C++
133 lines
4.9 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 <type_traits>
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namespace Catch {
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namespace Detail {
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class Approx {
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private:
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bool equalityComparisonImpl(double other) const;
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// Validates the new margin (margin >= 0)
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// out-of-line to avoid including stdexcept in the header
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void setMargin(double margin);
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// Validates the new epsilon (0 < epsilon < 1)
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// out-of-line to avoid including stdexcept in the header
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void setEpsilon(double epsilon);
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public:
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explicit Approx ( double value );
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static Approx custom();
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Approx operator-() const;
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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 const& value ) {
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Approx approx( static_cast<double>(value) );
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approx.m_epsilon = m_epsilon;
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approx.m_margin = m_margin;
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approx.m_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 const& 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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auto lhs_v = static_cast<double>(lhs);
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return rhs.equalityComparisonImpl(lhs_v);
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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 const& 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 const& 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 const& lhs, Approx const& rhs ) {
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return static_cast<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 const& rhs ) {
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return lhs.m_value < static_cast<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 const& lhs, Approx const& rhs ) {
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return static_cast<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 const& rhs ) {
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return lhs.m_value > static_cast<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 const& newEpsilon ) {
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double epsilonAsDouble = static_cast<double>(newEpsilon);
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setEpsilon(epsilonAsDouble);
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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 const& newMargin ) {
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double marginAsDouble = static_cast<double>(newMargin);
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setMargin(marginAsDouble);
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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 const& newScale ) {
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m_scale = static_cast<double>(newScale);
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return *this;
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}
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std::string toString() const;
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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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} // end namespace Detail
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namespace literals {
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Detail::Approx operator "" _a(long double val);
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Detail::Approx operator "" _a(unsigned long long val);
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} // end namespace literals
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template<>
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struct StringMaker<Catch::Detail::Approx> {
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static std::string convert(Catch::Detail::Approx const& value);
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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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