cgul_log2.h File Reference

log2() More...

#include "cgul_common.h"
#include "cgul_exception.h"

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Functions
CGUL_BEGIN_C CGUL_EXPORT int	cgul_log2__floor (cgul_exception_t *cex, unsigned long int n)
CGUL_EXPORT int	cgul_log2__ceil (cgul_exception_t *cex, unsigned long int n)

Detailed Description

log2(). Calculate the floor and ceiling of the base-2 logarithm of unsigned long types.

Author

Paul Serice

Function Documentation

cgul_log2__floor()

CGUL_BEGIN_C CGUL_EXPORT int cgul_log2__floor	(	cgul_exception_t *	cex,
		unsigned long int	n
	)

Return the floor of the base-2 logarithm of the number n. If n is zero, an exception is thrown.

Parameters

[in,out]	cex	c-style exception
[in]	n	number

Returns

floor(log2(n))

Referenced by cgul_log2_cxx::floor().

cgul_log2__ceil()

CGUL_EXPORT int cgul_log2__ceil	(	cgul_exception_t *	cex,
		unsigned long int	n
	)

Return the ceiling of the base-2 logarithm of the number n. If n is zero, an exception is thrown.

Parameters

[in,out]	cex	c-style exception
[in]	n	number

Returns

ceil(log2(n))

Referenced by cgul_log2_cxx::ceil().