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// -*- C++ -*-
//=============================================================================
/**
* @file OS_NS_math.h
*
* @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
* @author Jesper S. M|ller<stophph@diku.dk>
* @author and a cast of thousands...
*/
//=============================================================================
#ifndef ACE_OS_NS_MATH_H
# define ACE_OS_NS_MATH_H
# include /**/ "ace/pre.h"
# include "ace/config-all.h"
# if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
# endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/os_include/os_math.h"
#include <cmath>
#include /**/ "ace/ACE_export.h"
#if defined (ACE_EXPORT_MACRO)
# undef ACE_EXPORT_MACRO
#endif
#define ACE_EXPORT_MACRO ACE_Export
/*
* We inline and undef some functions that may be implemented
* as macros on some platforms. This way macro definitions will
* be usable later as there is no way to save the macro definition
* using the pre-processor.
*/
inline double ace_log2_helper (double x)
{
#if defined (log2)
return log2 (x);
#undef log2
#else
# if !defined (ACE_LACKS_LOG2)
return std::log2 (x);
# else
/*
==================================================================
log (x)
k
log (x) = -------
b log (b)
k
meaning the binary logarithm of x using the natural logarithm, for
example, is:
log (x)
e
log (x) = -------
2 log (2)
e
==================================================================
*/
// Precomputed value of 1/log(2.0). Saves an expensive division and
// computing log(2.0) in each call.
double const _1_ln2 = 1.442695040888963407359924681002;
return log (x) * _1_ln2;
# endif /* !ACE_LACKS_LOG2 */
#endif /* defined (log2) */
}
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
namespace ACE_OS
{
/// This method computes the largest integral value not greater than x.
template <typename T>
inline
T floor (T x)
{
return std::floor (x);
}
/// This method computes the smallest integral value not less than x.
template <typename T>
inline
T ceil (T x)
{
return std::ceil (x);
}
/// This method computes the base-2 logarithm of x.
ACE_NAMESPACE_INLINE_FUNCTION
double log2 (double x);
} /* namespace ACE_OS */
ACE_END_VERSIONED_NAMESPACE_DECL
# if defined (ACE_HAS_INLINED_OSCALLS)
# if defined (ACE_INLINE)
# undef ACE_INLINE
# endif /* ACE_INLINE */
# define ACE_INLINE inline
# include "ace/OS_NS_math.inl"
# endif /* ACE_HAS_INLINED_OSCALLS */
# include /**/ "ace/post.h"
#endif /* ACE_OS_NS_MATH_H */
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