diff options
Diffstat (limited to 'libs/pbd/msvc/msvc_pbd.cc')
| -rw-r--r-- | libs/pbd/msvc/msvc_pbd.cc | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/libs/pbd/msvc/msvc_pbd.cc b/libs/pbd/msvc/msvc_pbd.cc index ab79d8f45d..f49ac5393c 100644 --- a/libs/pbd/msvc/msvc_pbd.cc +++ b/libs/pbd/msvc/msvc_pbd.cc @@ -262,6 +262,47 @@ trunc(double x) return (floor(x)); } +#if defined(_MSC_VER) && (_MSC_VER < 1800) +//*************************************************************** +// +// expm1() +// +// Emulates C99 expm1() using exp(). +// +// Returns: +// +// On Success: (('e' raised to the power of 'x') - 1) +// (e.g. expm1(1) == 1.7182818). +// On Failure: None, except that calling exp(x) should generate +// an appropriate error for us (such as INF etc). +// +LIBPBD_API double PBD_APICALLTYPE +expm1(double x) +{ + return (exp(x) - (double)1.0); +} + +//*************************************************************** +// +// log1p() +// +// Emulates C99 log1p() using log(). +// +// Returns: +// +// On Success: The natural logarithm of (1 + x) +// (e.g. log1p(1) == 0.69314718). +// On Failure: None, except that calling log(x) should generate +// an appropriate error for us (such as ERANGE etc). +// +LIBPBD_API double PBD_APICALLTYPE +log1p(double x) +{ + return (log(x + (double)1.0)); +} +#endif + +#if defined(_MSC_VER) && (_MSC_VER < 1900) //*************************************************************** // // log2() @@ -280,6 +321,7 @@ log2(double x) { return (log(x) / log((double)2.0)); } +#endif namespace PBD { |