#include "ace/config-all.h"#include "ace/os_include/os_math.h"#include "ace/OS_NS_math.inl"Include dependency graph for OS_NS_math.h:
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Namespaces | |
| namespace | ACE_OS |
Defines | |
| #define | ACE_EXPORT_MACRO ACE_Export |
| #define | ACE_INLINE inline |
Functions | |
| double | ace_log2_helper (double x) |
Jesper S. M|ller<stophph@diku.dk>
and a cast of thousands...
Definition in file OS_NS_math.h.
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Definition at line 35 of file OS_NS_math.h. |
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Definition at line 110 of file OS_NS_math.h. |
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Definition at line 45 of file OS_NS_math.h. Referenced by ACE_OS::log2().
00046 {
00047 #if defined (log2)
00048 return log2 (x);
00049 #undef log2
00050 #else
00051 # if !defined (ACE_LACKS_LOG2)
00052 return ACE_STD_NAMESPACE::log2 (x);
00053 # else
00054 /*
00055 ==================================================================
00056
00057 log (x)
00058 k
00059 log (x) = -------
00060 b log (b)
00061 k
00062
00063 meaning the binary logarithm of x using the natural logarithm, for
00064 example, is:
00065
00066
00067 log (x)
00068 e
00069 log (x) = -------
00070 2 log (2)
00071 e
00072
00073 ==================================================================
00074 */
00075
00076 // Precomputed value of 1/log(2.0). Saves an expensive division and
00077 // computing log(2.0) in each call.
00078 double const _1_ln2 = 1.442695040888963407359924681002;
00079
00080 return log (x) * _1_ln2;
00081 # endif /* !ACE_LACKS_LOG2 */
00082 #endif /* defined (log2) */
00083 }
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1.3.6