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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"
#include <type_traits>
#include <stdexcept>
namespace Catch {
namespace Detail {
class Approx {
private:
bool equalityComparisonImpl(double other) const;
public:
explicit Approx ( double value );
static Approx custom();
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
Approx operator()( T const& value ) {
Approx approx( static_cast<double>(value) );
approx.epsilon( m_epsilon );
approx.margin( m_margin );
approx.scale( m_scale );
return approx;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
explicit Approx( T const& value ): Approx(static_cast<double>(value))
{}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator == ( const T& lhs, Approx const& rhs ) {
auto lhs_v = static_cast<double>(lhs);
return rhs.equalityComparisonImpl(lhs_v);
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator == ( Approx const& lhs, const T& rhs ) {
return operator==( rhs, lhs );
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator != ( T const& lhs, Approx const& rhs ) {
return !operator==( lhs, rhs );
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator != ( Approx const& lhs, T const& rhs ) {
return !operator==( rhs, lhs );
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator <= ( T const& lhs, Approx const& rhs ) {
return static_cast<double>(lhs) < rhs.m_value || lhs == rhs;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator <= ( Approx const& lhs, T const& rhs ) {
return lhs.m_value < static_cast<double>(rhs) || lhs == rhs;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator >= ( T const& lhs, Approx const& rhs ) {
return static_cast<double>(lhs) > rhs.m_value || lhs == rhs;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator >= ( Approx const& lhs, T const& rhs ) {
return lhs.m_value > static_cast<double>(rhs) || lhs == rhs;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
Approx& epsilon( T const& newEpsilon ) {
double epsilonAsDouble = static_cast<double>(newEpsilon);
if( epsilonAsDouble < 0 || epsilonAsDouble > 1.0 ) {
throw std::domain_error
( "Invalid Approx::epsilon: " +
Catch::Detail::stringify( epsilonAsDouble ) +
", Approx::epsilon has to be between 0 and 1" );
}
m_epsilon = epsilonAsDouble;
return *this;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
Approx& margin( T const& newMargin ) {
double marginAsDouble = static_cast<double>(newMargin);
if( marginAsDouble < 0 ) {
throw std::domain_error
( "Invalid Approx::margin: " +
Catch::Detail::stringify( marginAsDouble ) +
", Approx::Margin has to be non-negative." );
}
m_margin = marginAsDouble;
return *this;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
Approx& scale( T const& newScale ) {
m_scale = static_cast<double>(newScale);
return *this;
}
std::string toString() const;
private:
double m_epsilon;
double m_margin;
double m_scale;
double m_value;
};
}
template<>
struct StringMaker<Catch::Detail::Approx> {
static std::string convert(Catch::Detail::Approx const& value);
};
} // end namespace Catch
#endif // TWOBLUECUBES_CATCH_APPROX_HPP_INCLUDED
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