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Updated to use Richard Harris' approximation formula

This commit is contained in:
Phil Nash 2011-04-28 08:11:00 +01:00
parent d7c203c3e9
commit d7b8b01f3e
1 changed files with 16 additions and 24 deletions
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40
include/internal/catch_approx.hpp
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@ -18,27 +18,19 @@
namespace Catch
{
// !TBD Need to clean this all up
#define CATCH_absTol 1e-10
#define CATCH_relTol 1e-10
inline double catch_max( double x, double y )
{
return x > y ? x : y;
}
namespace Detail
{
class Approx
{
public:
///////////////////////////////////////////////////////////////////////////
// !TBD more generic
explicit Approx
(
double d
)
: m_d( d )
double d
)
: m_epsilon( 1e-10 ),
m_scale( 1.0 ),
m_d( d )
{
}
@ -46,27 +38,27 @@ namespace Catch
template<typename T>
friend bool operator ==
(
const T& lhs,
const Approx& rhs
)
const T& lhs,
const Approx& rhs
)
{
// !TBD Use proper tolerance
// From: http://realtimecollisiondetection.net/blog/?p=89
// see also: http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
return fabs( lhs - rhs.m_d ) <= catch_max( CATCH_absTol, CATCH_relTol * catch_max( fabs(lhs), fabs(rhs.m_d) ) );
// Thanks to Richard Harris for his help refining this formula
return fabs( lhs - rhs.m_d ) < rhs.m_epsilon * (rhs.m_scale + (std::max)( fabs(lhs), fabs(rhs.m_d) ) );
}
///////////////////////////////////////////////////////////////////////////
template<typename T>
friend bool operator !=
(
const T& lhs,
const Approx& rhs
)
const T& lhs,
const Approx& rhs
)
{
return ! operator==( lhs, rhs );
return !operator==( lhs, rhs );
}
double m_epsilon;
double m_scale;
double m_d;
};
}