| /* |
| * Created by Phil on 28/04/2011. |
| * Copyright 2010 Two Blue Cubes Ltd. All rights reserved. |
| * |
| * Distributed under the Boost Software License, Version 1.0. (See accompanying |
| * file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| */ |
| #ifndef TWOBLUECUBES_CATCH_APPROX_HPP_INCLUDED |
| #define TWOBLUECUBES_CATCH_APPROX_HPP_INCLUDED |
| |
| #include "catch_capture.hpp" |
| |
| #include <cmath> |
| #include <limits> |
| |
| namespace Catch { |
| namespace Detail { |
| |
| class Approx { |
| public: |
| explicit Approx ( double value ) |
| : m_epsilon( std::numeric_limits<float>::epsilon()*100 ), |
| m_scale( 1.0 ), |
| m_value( value ) |
| {} |
| |
| Approx( Approx const& other ) |
| : m_epsilon( other.m_epsilon ), |
| m_scale( other.m_scale ), |
| m_value( other.m_value ) |
| {} |
| |
| static Approx custom() { |
| return Approx( 0 ); |
| } |
| |
| Approx operator()( double value ) { |
| Approx approx( value ); |
| approx.epsilon( m_epsilon ); |
| approx.scale( m_scale ); |
| return approx; |
| } |
| |
| friend bool operator == ( double lhs, Approx const& rhs ) { |
| // Thanks to Richard Harris for his help refining this formula |
| return fabs( lhs - rhs.m_value ) < rhs.m_epsilon * (rhs.m_scale + (std::max)( fabs(lhs), fabs(rhs.m_value) ) ); |
| } |
| |
| friend bool operator == ( Approx const& lhs, double rhs ) { |
| return operator==( rhs, lhs ); |
| } |
| |
| friend bool operator != ( double lhs, Approx const& rhs ) { |
| return !operator==( lhs, rhs ); |
| } |
| |
| friend bool operator != ( Approx const& lhs, double rhs ) { |
| return !operator==( rhs, lhs ); |
| } |
| |
| Approx& epsilon( double newEpsilon ) { |
| m_epsilon = newEpsilon; |
| return *this; |
| } |
| |
| Approx& scale( double newScale ) { |
| m_scale = newScale; |
| return *this; |
| } |
| |
| std::string toString() const { |
| std::ostringstream oss; |
| oss << "Approx( " << m_value << " )"; |
| return oss.str(); |
| } |
| |
| private: |
| double m_epsilon; |
| double m_scale; |
| double m_value; |
| }; |
| } |
| |
| template<> |
| inline std::string toString<Detail::Approx>( Detail::Approx const& value ) { |
| return value.toString(); |
| } |
| |
| } // end namespace Catch |
| |
| #endif // TWOBLUECUBES_CATCH_APPROX_HPP_INCLUDED |