diff options
Diffstat (limited to 'libs/pbd/msvc/msvc_pbd.cc')
| -rw-r--r-- | libs/pbd/msvc/msvc_pbd.cc | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/libs/pbd/msvc/msvc_pbd.cc b/libs/pbd/msvc/msvc_pbd.cc index ddef968569..ab79d8f45d 100644 --- a/libs/pbd/msvc/msvc_pbd.cc +++ b/libs/pbd/msvc/msvc_pbd.cc @@ -262,6 +262,25 @@ trunc(double x) return (floor(x)); } +//*************************************************************** +// +// log2() +// +// Emulates C99 log2() using log(). +// +// Returns: +// +// On Success: The binary (base-2) logarithm of 'x' +// (e.g. log2(1024) == 10). +// On Failure: None, except that calling log(x) should generate +// an appropriate error for us (such as ERANGE etc). +// +LIBPBD_API double PBD_APICALLTYPE +log2(double x) +{ + return (log(x) / log((double)2.0)); +} + namespace PBD { //*************************************************************** |