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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 <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( " << Catch::toString( 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