MathsCustomFunctions.hpp File Reference

#include <cfloat>

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Classes
class	CompareDoubles
Functions
double	SmallPow (double x, unsigned exponent)
unsigned	SmallPow (unsigned x, unsigned exponent)
bool	Divides (double smallerNumber, double largerNumber)
unsigned	CeilDivide (unsigned numerator, unsigned denominator)
double	Signum (double value)

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Detailed Description

This file contains some utility functions and a small class for dealing with floating point numbers.

Definition in file MathsCustomFunctions.hpp.

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Function Documentation

unsigned CeilDivide	(	unsigned	numerator,
		unsigned	denominator
	)

Returns:

the result of dividing (unsigned) numerator by denominator, rounded up (away from 0), and overflow-safe for large integers up to UINT_MAX.

Parameters:

	numerator	the numerator
	denominator	the denominator

Definition at line 137 of file MathsCustomFunctions.cpp.

bool Divides	(	double	smallerNumber,
		double	largerNumber
	)

Returns:

true if the smaller number divides the larger (to machine precision) Uses fmod to determine if smallerNumber divides the largerNumber. We expect smallerNumber/largerNumber <= 1 and therefore fmod(largerNumber,smallerNumber) should be close to zero or close to smallerNumber.

Parameters:

	smallerNumber	the smaller
	largerNumber	the larger

Definition at line 114 of file MathsCustomFunctions.cpp.

double Signum

(

double

value

)

Returns:

the sign of the argument, i.e. -1 if value<0, 0 if value=0, or +1 if value>0.

Parameters:

value

the argument value

Definition at line 150 of file MathsCustomFunctions.cpp.

unsigned SmallPow	(	unsigned	x,
		unsigned	exponent
	)

Replacement "pow" function for unsigned integer values

Parameters:

	x	number to be raised to a small power
	exponent	small integer exponent

Returns:

x^exponent a.k.a x**exponent.

Definition at line 77 of file MathsCustomFunctions.cpp.

double SmallPow	(	double	x,
		unsigned	exponent
	)

Replacement "pow" function.

Parameters:

	x	number to be raised to a small power
	exponent	small integer exponent

Returns:

x^exponent a.k.a x**exponent.

Definition at line 41 of file MathsCustomFunctions.cpp.