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Added an optional absolute margin to the approximation checks

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cnugteren 2015-11-12 15:07:20 +01:00 committed by CNugteren
parent 92356769f1
commit 2585d280d1
1 changed files with 15 additions and 1 deletions
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16
include/internal/catch_approx.hpp
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@ -20,12 +20,14 @@ namespace Detail {
public:
explicit Approx ( double value )
: m_epsilon( std::numeric_limits<float>::epsilon()*100 ),
m_margin( 0.0 ),
m_scale( 1.0 ),
m_value( value )
{}
Approx( Approx const& other )
: m_epsilon( other.m_epsilon ),
m_margin( other.m_margin ),
m_scale( other.m_scale ),
m_value( other.m_value )
{}
@ -37,13 +39,19 @@ namespace Detail {
Approx operator()( double value ) {
Approx approx( value );
approx.epsilon( m_epsilon );
approx.margin( m_margin );
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) ) );
auto relativeOK = fabs( lhs - rhs.m_value ) < rhs.m_epsilon * (rhs.m_scale + (std::max)( fabs(lhs), fabs(rhs.m_value) ) );
if ( relativeOK ) {
return true;
}
auto absoluteOK = fabs( lhs - rhs.m_value ) < rhs.m_margin;
return absoluteOK;
}
friend bool operator == ( Approx const& lhs, double rhs ) {
@ -63,6 +71,11 @@ namespace Detail {
return *this;
}
Approx& margin( double newMargin ) {
m_margin = newMargin;
return *this;
}
Approx& scale( double newScale ) {
m_scale = newScale;
return *this;
@ -76,6 +89,7 @@ namespace Detail {
private:
double m_epsilon;
double m_margin;
double m_scale;
double m_value;
};