diff options
Diffstat (limited to 'cutl/details/boost/functional/hash/detail/float_functions.hpp')
-rw-r--r-- | cutl/details/boost/functional/hash/detail/float_functions.hpp | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/cutl/details/boost/functional/hash/detail/float_functions.hpp b/cutl/details/boost/functional/hash/detail/float_functions.hpp index 0686928..1d5a02b 100644 --- a/cutl/details/boost/functional/hash/detail/float_functions.hpp +++ b/cutl/details/boost/functional/hash/detail/float_functions.hpp @@ -13,6 +13,94 @@ # pragma once #endif +// Set BOOST_HASH_CONFORMANT_FLOATS to 1 for libraries known to have +// sufficiently good floating point support to not require any +// workarounds. +// +// When set to 0, the library tries to automatically +// use the best available implementation. This normally works well, but +// breaks when ambiguities are created by odd namespacing of the functions. +// +// Note that if this is set to 0, the library should still take full +// advantage of the platform's floating point support. + +#if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION) +# define BOOST_HASH_CONFORMANT_FLOATS 0 +#elif defined(__LIBCOMO__) +# define BOOST_HASH_CONFORMANT_FLOATS 0 +#elif defined(__STD_RWCOMPILER_H__) || defined(_RWSTD_VER) +// Rogue Wave library: +# define BOOST_HASH_CONFORMANT_FLOATS 0 +#elif defined(_LIBCPP_VERSION) +// libc++ +# define BOOST_HASH_CONFORMANT_FLOATS 1 +#elif defined(__GLIBCPP__) || defined(__GLIBCXX__) +// GNU libstdc++ 3 +# if defined(__GNUC__) && __GNUC__ >= 4 +# define BOOST_HASH_CONFORMANT_FLOATS 1 +# else +# define BOOST_HASH_CONFORMANT_FLOATS 0 +# endif +#elif defined(__STL_CONFIG_H) +// generic SGI STL +# define BOOST_HASH_CONFORMANT_FLOATS 0 +#elif defined(__MSL_CPP__) +// MSL standard lib: +# define BOOST_HASH_CONFORMANT_FLOATS 0 +#elif defined(__IBMCPP__) +// VACPP std lib (probably conformant for much earlier version). +# if __IBMCPP__ >= 1210 +# define BOOST_HASH_CONFORMANT_FLOATS 1 +# else +# define BOOST_HASH_CONFORMANT_FLOATS 0 +# endif +#elif defined(MSIPL_COMPILE_H) +// Modena C++ standard library +# define BOOST_HASH_CONFORMANT_FLOATS 0 +#elif (defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER) +// Dinkumware Library (this has to appear after any possible replacement libraries): +# if _CPPLIB_VER >= 405 +# define BOOST_HASH_CONFORMANT_FLOATS 1 +# else +# define BOOST_HASH_CONFORMANT_FLOATS 0 +# endif +#else +# define BOOST_HASH_CONFORMANT_FLOATS 0 +#endif + +#if BOOST_HASH_CONFORMANT_FLOATS + +// The standard library is known to be compliant, so don't use the +// configuration mechanism. + +namespace cutl_details_boost { + namespace hash_detail { + template <typename Float> + struct call_ldexp { + typedef Float float_type; + inline Float operator()(Float x, int y) const { + return std::ldexp(x, y); + } + }; + + template <typename Float> + struct call_frexp { + typedef Float float_type; + inline Float operator()(Float x, int* y) const { + return std::frexp(x, y); + } + }; + + template <typename Float> + struct select_hash_type + { + typedef Float type; + }; + } +} + +#else // BOOST_HASH_CONFORMANT_FLOATS == 0 + // The C++ standard requires that the C float functions are overloarded // for float, double and long double in the std namespace, but some of the older // library implementations don't support this. On some that don't, the C99 @@ -243,4 +331,6 @@ namespace cutl_details_boost } } +#endif // BOOST_HASH_CONFORMANT_FLOATS + #endif |