catch2/include/internal/catch_approx.hpp

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/*
* 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_tostring.h"
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#include <cmath>
#include <limits>
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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 )
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: m_epsilon( other.m_epsilon ),
m_scale( other.m_scale ),
m_value( other.m_value )
{}
static Approx custom() {
return Approx( 0 );
}
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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 ) {
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// 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 ) {
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return operator==( rhs, lhs );
}
friend bool operator != ( double lhs, Approx const& rhs ) {
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return !operator==( lhs, rhs );
}
friend bool operator != ( Approx const& lhs, double rhs ) {
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return !operator==( rhs, lhs );
}
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Approx& epsilon( double newEpsilon ) {
m_epsilon = newEpsilon;
return *this;
}
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Approx& scale( double newScale ) {
m_scale = newScale;
return *this;
}
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std::string toString() const {
std::ostringstream oss;
oss << "Approx( " << Catch::toString( m_value ) << " )";
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return oss.str();
}
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private:
double m_epsilon;
double m_scale;
double m_value;
};
}
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template<>
inline std::string toString<Detail::Approx>( Detail::Approx const& value ) {
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return value.toString();
}
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} // end namespace Catch
#endif // TWOBLUECUBES_CATCH_APPROX_HPP_INCLUDED