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qgis.h: proposes a generic templated method from qgsDoubleNear and qgsNumberNear

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This commit is contained in:
Loïc Bartoletti 2023-12-14 19:55:36 +01:00
parent 7a1937536a
commit b5c5029e93
3 changed files with 26 additions and 14 deletions
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1
python/PyQt6/core/auto_generated/qgis.sip.in
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@ -2555,6 +2555,7 @@ Compare two doubles, treating nan values as equal
.. versionadded:: 3.20 .. versionadded:: 3.20
%End %End
bool qgsDoubleNear( double a, double b, double epsilon = 4 * DBL_EPSILON ); bool qgsDoubleNear( double a, double b, double epsilon = 4 * DBL_EPSILON );
%Docstring %Docstring
Compare two doubles (but allow some difference) Compare two doubles (but allow some difference)

1
python/core/auto_generated/qgis.sip.in
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@ -2555,6 +2555,7 @@ Compare two doubles, treating nan values as equal
.. versionadded:: 3.20 .. versionadded:: 3.20
%End %End
bool qgsDoubleNear( double a, double b, double epsilon = 4 * DBL_EPSILON ); bool qgsDoubleNear( double a, double b, double epsilon = 4 * DBL_EPSILON );
%Docstring %Docstring
Compare two doubles (but allow some difference) Compare two doubles (but allow some difference)

38
src/core/qgis.h
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@ -4419,6 +4419,28 @@ inline bool qgsNanCompatibleEquals( double a, double b )
return a == b; return a == b;
} }
#ifndef SIP_RUN
/**
* Compare two numbers of type T (but allow some difference)
* \param a first number
* \param b second number
* \param epsilon maximum difference allowable between numbers
* \since 3.36
*/
template<typename T>
inline bool qgsNumberNear( T a, T b, T epsilon = std::numeric_limits<T>::epsilon() * 4 )
{
const bool aIsNan = std::isnan( a );
const bool bIsNan = std::isnan( b );
if ( aIsNan || bIsNan )
return aIsNan && bIsNan;
const T diff = a - b;
return diff >= -epsilon && diff <= epsilon;
}
#endif
/** /**
* Compare two doubles (but allow some difference) * Compare two doubles (but allow some difference)
* \param a first double * \param a first double
@ -4427,13 +4449,7 @@ inline bool qgsNanCompatibleEquals( double a, double b )
*/ */
inline bool qgsDoubleNear( double a, double b, double epsilon = 4 * std::numeric_limits<double>::epsilon() ) inline bool qgsDoubleNear( double a, double b, double epsilon = 4 * std::numeric_limits<double>::epsilon() )
{ {
const bool aIsNan = std::isnan( a ); return qgsNumberNear<double>( a, b, epsilon );
const bool bIsNan = std::isnan( b );
if ( aIsNan || bIsNan )
return aIsNan && bIsNan;
const double diff = a - b;
return diff >= -epsilon && diff <= epsilon;
} }
/** /**
@ -4444,13 +4460,7 @@ inline bool qgsDoubleNear( double a, double b, double epsilon = 4 * std::numeric
*/ */
inline bool qgsFloatNear( float a, float b, float epsilon = 4 * FLT_EPSILON ) inline bool qgsFloatNear( float a, float b, float epsilon = 4 * FLT_EPSILON )
{ {
const bool aIsNan = std::isnan( a ); return qgsNumberNear<float>( a, b, epsilon );
const bool bIsNan = std::isnan( b );
if ( aIsNan || bIsNan )
return aIsNan && bIsNan;
const float diff = a - b;
return diff >= -epsilon && diff <= epsilon;
} }
//! Compare two doubles using specified number of significant digits //! Compare two doubles using specified number of significant digits