Swiftdiff options
| author | Remko Tronçon <git@el-tramo.be> | 2010-04-11 18:19:17 (GMT) |
|---|---|---|
| committer | Remko Tronçon <git@el-tramo.be> | 2010-04-11 19:20:07 (GMT) |
| commit | 857e44c156a1dbefcb49bb5792c4384cebd8762a (patch) | |
| tree | 11947fb81ad9c502627f1b2bb8f090fb8d53c107 /3rdParty/Boost/src/boost/functional/hash/detail | |
| parent | 77d4eb7588e113beaa03f3347523b26adefdeb06 (diff) | |
| download | swift-857e44c156a1dbefcb49bb5792c4384cebd8762a.zip swift-857e44c156a1dbefcb49bb5792c4384cebd8762a.tar.bz2 | |
Updated Boost to 1.42.
Diffstat (limited to '3rdParty/Boost/src/boost/functional/hash/detail')
5 files changed, 455 insertions, 257 deletions
diff --git a/3rdParty/Boost/src/boost/functional/hash/detail/float_functions.hpp b/3rdParty/Boost/src/boost/functional/hash/detail/float_functions.hpp index 69cf91a..ae03ff0 100644 --- a/3rdParty/Boost/src/boost/functional/hash/detail/float_functions.hpp +++ b/3rdParty/Boost/src/boost/functional/hash/detail/float_functions.hpp @@ -6,6 +6,7 @@ #if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_FLOAT_FUNCTIONS_HPP) #define BOOST_FUNCTIONAL_HASH_DETAIL_FLOAT_FUNCTIONS_HPP +#include <boost/config.hpp> #include <boost/config/no_tr1/cmath.hpp> #if defined(_MSC_VER) && (_MSC_VER >= 1020) @@ -17,146 +18,229 @@ // library implementations don't support this. On some that don't, the C99 // float functions (frexpf, frexpl, etc.) are available. // -// Some of this is based on guess work. If I don't know any better I assume that -// the standard C++ overloaded functions are available. If they're not then this -// means that the argument is cast to a double and back, which is inefficient -// and will give pretty bad results for long doubles - so if you know better -// let me know. - -// STLport: -#if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION) -# if (defined(__GNUC__) && __GNUC__ < 3 && (defined(linux) || defined(__linux) || defined(__linux__))) || defined(__DMC__) -# define BOOST_HASH_USE_C99_FLOAT_FUNCS -# elif defined(BOOST_MSVC) && BOOST_MSVC < 1300 -# define BOOST_HASH_USE_C99_FLOAT_FUNCS -# else -# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS -# endif - -// Roguewave: +// The following tries to automatically detect which are available. + +namespace boost { + namespace hash_detail { + + // Returned by dummy versions of the float functions. + + struct not_found { + // Implicitly convertible to float and long double in order to avoid + // a compile error when the dummy float functions are used. + + inline operator float() const { return 0; } + inline operator long double() const { return 0; } + }; + + // A type for detecting the return type of functions. + + template <typename T> struct is; + template <> struct is<float> { char x[10]; }; + template <> struct is<double> { char x[20]; }; + template <> struct is<long double> { char x[30]; }; + template <> struct is<boost::hash_detail::not_found> { char x[40]; }; + + // Used to convert the return type of a function to a type for sizeof. + + template <typename T> is<T> float_type(T); + + // call_ldexp + // + // This will get specialized for float and long double + + template <typename Float> struct call_ldexp + { + typedef double float_type; + + inline double operator()(double a, int b) const + { + using namespace std; + return ldexp(a, b); + } + }; + + // call_frexp + // + // This will get specialized for float and long double + + template <typename Float> struct call_frexp + { + typedef double float_type; + + inline double operator()(double a, int* b) const + { + using namespace std; + return frexp(a, b); + } + }; + } +} + +// A namespace for dummy functions to detect when the actual function we want +// isn't available. ldexpl, ldexpf etc. might be added tby the macros below. // -// On borland 5.51, with roguewave 2.1.1 the standard C++ overloads aren't -// defined, but for the same version of roguewave on sunpro they are. -#elif defined(_RWSTD_VER) -# if defined(__BORLANDC__) -# define BOOST_HASH_USE_C99_FLOAT_FUNCS -# define BOOST_HASH_C99_NO_FLOAT_FUNCS -# elif defined(__DECCXX) -# define BOOST_HASH_USE_C99_FLOAT_FUNCS -# else -# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS -# endif - -// libstdc++ (gcc 3.0 onwards, I think) -#elif defined(__GLIBCPP__) || defined(__GLIBCXX__) -# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS - -// SGI: -#elif defined(__STL_CONFIG_H) -# if defined(linux) || defined(__linux) || defined(__linux__) -# define BOOST_HASH_USE_C99_FLOAT_FUNCS -# else -# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS -# endif - -// vxWorks. It has its own math library, but uses Dinkumware STL -#elif defined(__VXWORKS__) -# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS - -// Dinkumware. -#elif (defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER) -// Some versions of Visual C++ don't seem to have the C++ overloads but they -// all seem to have the c99 float overloads -# if defined(BOOST_MSVC) -# define BOOST_HASH_USE_C99_FLOAT_FUNCS -// On other platforms the C++ overloads seem to have been introduced sometime -// before 402. -# elif defined(_CPPLIB_VER) && (_CPPLIB_VER >= 402) -# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS -# else -# define BOOST_HASH_USE_C99_FLOAT_FUNCS -# endif - -// Digital Mars -#elif defined(__DMC__) -# define BOOST_HASH_USE_C99_FLOAT_FUNCS - -// Use overloaded float functions by default. -#else -# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS -#endif +// AFAICT these have to be outside of the boost namespace, as if they're in +// the boost namespace they'll always be preferable to any other function +// (since the arguments are built in types, ADL can't be used). -namespace boost -{ - namespace hash_detail - { +namespace boost_hash_detect_float_functions { + template <class Float> boost::hash_detail::not_found ldexp(Float, int); + template <class Float> boost::hash_detail::not_found frexp(Float, int*); +} - inline float call_ldexp(float v, int exp) - { - using namespace std; -#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS) || \ - defined(BOOST_HASH_C99_NO_FLOAT_FUNCS) - return ldexp(v, exp); -#else - return ldexpf(v, exp); -#endif - } +// Macros for generating specializations of call_ldexp and call_frexp. +// +// check_cpp and check_c99 check if the C++ or C99 functions are available. +// +// Then the call_* functions select an appropriate implementation. +// +// I used c99_func in a few places just to get a unique name. +// +// Important: when using 'using namespace' at namespace level, include as +// little as possible in that namespace, as Visual C++ has an odd bug which +// can cause the namespace to be imported at the global level. This seems to +// happen mainly when there's a template in the same namesapce. + +#define BOOST_HASH_CALL_FLOAT_FUNC(cpp_func, c99_func, type1, type2) \ +namespace boost_hash_detect_float_functions { \ + template <class Float> \ + boost::hash_detail::not_found c99_func(Float, type2); \ +} \ + \ +namespace boost { \ + namespace hash_detail { \ + namespace c99_func##_detect { \ + using namespace std; \ + using namespace boost_hash_detect_float_functions; \ + \ + struct check { \ + static type1 x; \ + static type2 y; \ + BOOST_STATIC_CONSTANT(bool, cpp = \ + sizeof(float_type(cpp_func(x,y))) \ + == sizeof(is<type1>)); \ + BOOST_STATIC_CONSTANT(bool, c99 = \ + sizeof(float_type(c99_func(x,y))) \ + == sizeof(is<type1>)); \ + }; \ + } \ + \ + template <bool x> \ + struct call_c99_##c99_func : \ + boost::hash_detail::call_##cpp_func<double> {}; \ + \ + template <> \ + struct call_c99_##c99_func<true> { \ + typedef type1 float_type; \ + \ + template <typename T> \ + inline type1 operator()(type1 a, T b) const \ + { \ + using namespace std; \ + return c99_func(a, b); \ + } \ + }; \ + \ + template <bool x> \ + struct call_cpp_##c99_func : \ + call_c99_##c99_func< \ + ::boost::hash_detail::c99_func##_detect::check::c99 \ + > {}; \ + \ + template <> \ + struct call_cpp_##c99_func<true> { \ + typedef type1 float_type; \ + \ + template <typename T> \ + inline type1 operator()(type1 a, T b) const \ + { \ + using namespace std; \ + return cpp_func(a, b); \ + } \ + }; \ + \ + template <> \ + struct call_##cpp_func<type1> : \ + call_cpp_##c99_func< \ + ::boost::hash_detail::c99_func##_detect::check::cpp \ + > {}; \ + } \ +} - inline double call_ldexp(double v, int exp) - { - using namespace std; - return ldexp(v, exp); - } +#define BOOST_HASH_CALL_FLOAT_MACRO(cpp_func, c99_func, type1, type2) \ +namespace boost { \ + namespace hash_detail { \ + \ + template <> \ + struct call_##cpp_func<type1> { \ + typedef type1 float_type; \ + inline type1 operator()(type1 x, type2 y) const { \ + return c99_func(x, y); \ + } \ + }; \ + } \ +} - inline long double call_ldexp(long double v, int exp) - { - using namespace std; -#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS) - return ldexp(v, exp); +#if defined(ldexpf) +BOOST_HASH_CALL_FLOAT_MACRO(ldexp, ldexpf, float, int) #else - return ldexpl(v, exp); +BOOST_HASH_CALL_FLOAT_FUNC(ldexp, ldexpf, float, int) #endif - } - inline float call_frexp(float v, int* exp) - { - using namespace std; -#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS) || \ - defined(BOOST_HASH_C99_NO_FLOAT_FUNCS) - return frexp(v, exp); +#if defined(ldexpl) +BOOST_HASH_CALL_FLOAT_MACRO(ldexp, ldexpl, long double, int) #else - return frexpf(v, exp); +BOOST_HASH_CALL_FLOAT_FUNC(ldexp, ldexpl, long double, int) #endif - } - - inline double call_frexp(double v, int* exp) - { - using namespace std; - return frexp(v, exp); - } - inline long double call_frexp(long double v, int* exp) - { - using namespace std; -#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS) - return frexp(v, exp); +#if defined(frexpf) +BOOST_HASH_CALL_FLOAT_MACRO(frexp, frexpf, float, int*) #else - return frexpl(v, exp); +BOOST_HASH_CALL_FLOAT_FUNC(frexp, frexpf, float, int*) #endif - } - } -} -#if defined(BOOST_HASH_USE_C99_FLOAT_FUNCS) -#undef BOOST_HASH_USE_C99_FLOAT_FUNCS +#if defined(frexpl) +BOOST_HASH_CALL_FLOAT_MACRO(frexp, frexpl, long double, int*) +#else +BOOST_HASH_CALL_FLOAT_FUNC(frexp, frexpl, long double, int*) #endif -#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS) -#undef BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS -#endif +#undef BOOST_HASH_CALL_FLOAT_MACRO +#undef BOOST_HASH_CALL_FLOAT_FUNC -#if defined(BOOST_HASH_C99_NO_FLOAT_FUNCS) -#undef BOOST_HASH_C99_NO_FLOAT_FUNCS -#endif + +namespace boost +{ + namespace hash_detail + { + template <typename Float1, typename Float2> + struct select_hash_type_impl { + typedef double type; + }; + + template <> + struct select_hash_type_impl<float, float> { + typedef float type; + }; + + template <> + struct select_hash_type_impl<long double, long double> { + typedef long double type; + }; + + + // select_hash_type + // + // If there is support for a particular floating point type, use that + // otherwise use double (there's always support for double). + + template <typename Float> + struct select_hash_type : select_hash_type_impl< + BOOST_DEDUCED_TYPENAME call_ldexp<Float>::float_type, + BOOST_DEDUCED_TYPENAME call_frexp<Float>::float_type + > {}; + } +} #endif diff --git a/3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp b/3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp index 5d5ac34..ea1bc25 100644 --- a/3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp +++ b/3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp @@ -10,164 +10,57 @@ # pragma once #endif -#if defined(BOOST_MSVC) -#pragma warning(push) -#if BOOST_MSVC >= 1400 -#pragma warning(disable:6294) // Ill-defined for-loop: initial condition does - // not satisfy test. Loop body not executed -#endif -#endif - +#include <boost/config.hpp> #include <boost/functional/hash/detail/float_functions.hpp> +#include <boost/functional/hash/detail/limits.hpp> #include <boost/integer/static_log2.hpp> #include <boost/cstdint.hpp> -#include <boost/limits.hpp> #include <boost/assert.hpp> -// Select implementation for the current platform. +// Include hash implementation for the current platform. // Cygwn #if defined(__CYGWIN__) # if defined(__i386__) || defined(_M_IX86) -# define BOOST_HASH_USE_x86_BINARY_HASH +# include <boost/functional/hash/detail/hash_float_x86.hpp> +# else +# include <boost/functional/hash/detail/hash_float_generic.hpp> # endif +#else +# include <boost/functional/hash/detail/hash_float_generic.hpp> +#endif + +// Can we use fpclassify? // STLport -#elif defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION) -// fpclassify aren't good enough on STLport. +#if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION) +#define BOOST_HASH_USE_FPCLASSIFY 0 // GNU libstdc++ 3 #elif defined(__GLIBCPP__) || defined(__GLIBCXX__) # if (defined(__USE_ISOC99) || defined(_GLIBCXX_USE_C99_MATH)) && \ !(defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)) -# define BOOST_HASH_USE_FPCLASSIFY +# define BOOST_HASH_USE_FPCLASSIFY 1 +# else +# define BOOST_HASH_USE_FPCLASSIFY 0 # endif -// Dinkumware Library, on Visual C++ -#elif (defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER) - -// Not using _fpclass because it is only available for double. - +// Everything else +#else +# define BOOST_HASH_USE_FPCLASSIFY 0 #endif -// On OpenBSD, numeric_limits is not reliable for long doubles, but -// the macros defined in <float.h> are. +#if BOOST_HASH_USE_FPCLASSIFY -#if defined(__OpenBSD__) -#include <float.h> -#endif +#include <boost/config/no_tr1/cmath.hpp> namespace boost { namespace hash_detail { template <class T> - struct limits : std::numeric_limits<T> {}; - -#if defined(__OpenBSD__) - template <> - struct limits<long double> - : std::numeric_limits<long double> - { - static long double epsilon() { - return LDBL_EPSILON; - } - - static long double (max)() { - return LDBL_MAX; - } - - static long double (min)() { - return LDBL_MIN; - } - - BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG); - BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP); - BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP); - }; -#endif // __OpenBSD__ - - inline void hash_float_combine(std::size_t& seed, std::size_t value) - { - seed ^= value + (seed<<6) + (seed>>2); - } - -// A simple, non-portable hash algorithm for x86. -#if defined(BOOST_HASH_USE_x86_BINARY_HASH) - inline std::size_t float_hash_impl(float v) - { - boost::uint32_t* ptr = (boost::uint32_t*)&v; - std::size_t seed = *ptr; - return seed; - } - - inline std::size_t float_hash_impl(double v) - { - boost::uint32_t* ptr = (boost::uint32_t*)&v; - std::size_t seed = *ptr++; - hash_float_combine(seed, *ptr); - return seed; - } - - inline std::size_t float_hash_impl(long double v) - { - boost::uint32_t* ptr = (boost::uint32_t*)&v; - std::size_t seed = *ptr++; - hash_float_combine(seed, *ptr++); - hash_float_combine(seed, *(boost::uint16_t*)ptr); - return seed; - } - -#else - - template <class T> - inline std::size_t float_hash_impl(T v) - { - int exp = 0; - - v = boost::hash_detail::call_frexp(v, &exp); - - // A postive value is easier to hash, so combine the - // sign with the exponent. - if(v < 0) { - v = -v; - exp += limits<T>::max_exponent - - limits<T>::min_exponent; - } - - // The result of frexp is always between 0.5 and 1, so its - // top bit will always be 1. Subtract by 0.5 to remove that. - v -= T(0.5); - v = boost::hash_detail::call_ldexp(v, - limits<std::size_t>::digits + 1); - std::size_t seed = static_cast<std::size_t>(v); - v -= seed; - - // ceiling(digits(T) * log2(radix(T))/ digits(size_t)) - 1; - std::size_t const length - = (limits<T>::digits * - boost::static_log2<limits<T>::radix>::value - 1) - / limits<std::size_t>::digits; - - for(std::size_t i = 0; i != length; ++i) - { - v = boost::hash_detail::call_ldexp(v, - limits<std::size_t>::digits); - std::size_t part = static_cast<std::size_t>(v); - v -= part; - hash_float_combine(seed, part); - } - - hash_float_combine(seed, exp); - - return seed; - } -#endif - - template <class T> inline std::size_t float_hash_value(T v) { -#if defined(BOOST_HASH_USE_FPCLASSIFY) using namespace std; switch (fpclassify(v)) { case FP_ZERO: @@ -183,15 +76,26 @@ namespace boost BOOST_ASSERT(0); return 0; } -#else + } + } +} + +#else // !BOOST_HASH_USE_FPCLASSIFY + +namespace boost +{ + namespace hash_detail + { + template <class T> + inline std::size_t float_hash_value(T v) + { return v == 0 ? 0 : float_hash_impl(v); -#endif } } } -#if defined(BOOST_MSVC) -#pragma warning(pop) -#endif +#endif // BOOST_HASH_USE_FPCLASSIFY + +#undef BOOST_HASH_USE_FPCLASSIFY #endif diff --git a/3rdParty/Boost/src/boost/functional/hash/detail/hash_float_generic.hpp b/3rdParty/Boost/src/boost/functional/hash/detail/hash_float_generic.hpp new file mode 100644 index 0000000..f9acee9 --- /dev/null +++ b/3rdParty/Boost/src/boost/functional/hash/detail/hash_float_generic.hpp @@ -0,0 +1,93 @@ + +// Copyright 2005-2009 Daniel James. +// Distributed under the Boost Software License, Version 1.0. (See accompanying +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) + +// A general purpose hash function for non-zero floating point values. + +#if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_GENERIC_HEADER) +#define BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_GENERIC_HEADER + +#include <boost/functional/hash/detail/float_functions.hpp> +#include <boost/integer/static_log2.hpp> +#include <boost/functional/hash/detail/limits.hpp> + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma once +#endif + +#if defined(BOOST_MSVC) +#pragma warning(push) +#if BOOST_MSVC >= 1400 +#pragma warning(disable:6294) // Ill-defined for-loop: initial condition does + // not satisfy test. Loop body not executed +#endif +#endif + +namespace boost +{ + namespace hash_detail + { + inline void hash_float_combine(std::size_t& seed, std::size_t value) + { + seed ^= value + (seed<<6) + (seed>>2); + } + + template <class T> + inline std::size_t float_hash_impl2(T v) + { + boost::hash_detail::call_frexp<T> frexp; + boost::hash_detail::call_ldexp<T> ldexp; + + int exp = 0; + + v = frexp(v, &exp); + + // A postive value is easier to hash, so combine the + // sign with the exponent and use the absolute value. + if(v < 0) { + v = -v; + exp += limits<T>::max_exponent - + limits<T>::min_exponent; + } + + // The result of frexp is always between 0.5 and 1, so its + // top bit will always be 1. Subtract by 0.5 to remove that. + v -= T(0.5); + v = ldexp(v, limits<std::size_t>::digits + 1); + std::size_t seed = static_cast<std::size_t>(v); + v -= seed; + + // ceiling(digits(T) * log2(radix(T))/ digits(size_t)) - 1; + std::size_t const length + = (limits<T>::digits * + boost::static_log2<limits<T>::radix>::value - 1) + / limits<std::size_t>::digits; + + for(std::size_t i = 0; i != length; ++i) + { + v = ldexp(v, limits<std::size_t>::digits); + std::size_t part = static_cast<std::size_t>(v); + v -= part; + hash_float_combine(seed, part); + } + + hash_float_combine(seed, exp); + + return seed; + } + + template <class T> + inline std::size_t float_hash_impl(T v) + { + typedef BOOST_DEDUCED_TYPENAME select_hash_type<T>::type type; + return float_hash_impl2(static_cast<type>(v)); + } + } +} + +#if defined(BOOST_MSVC) +#pragma warning(pop) +#endif + +#endif diff --git a/3rdParty/Boost/src/boost/functional/hash/detail/hash_float_x86.hpp b/3rdParty/Boost/src/boost/functional/hash/detail/hash_float_x86.hpp new file mode 100644 index 0000000..b39bb0d --- /dev/null +++ b/3rdParty/Boost/src/boost/functional/hash/detail/hash_float_x86.hpp @@ -0,0 +1,56 @@ + +// Copyright 2005-2009 Daniel James. +// Distributed under the Boost Software License, Version 1.0. (See accompanying +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) + +// A non-portable hash function form non-zero floats on x86. +// +// Even if you're on an x86 platform, this might not work if their floating +// point isn't set up as this expects. So this should only be used if it's +// absolutely certain that it will work. + +#if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_X86_HEADER) +#define BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_X86_HEADER + +#include <boost/cstdint.hpp> + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma once +#endif + +namespace boost +{ + namespace hash_detail + { + inline void hash_float_combine(std::size_t& seed, std::size_t value) + { + seed ^= value + (seed<<6) + (seed>>2); + } + + inline std::size_t float_hash_impl(float v) + { + boost::uint32_t* ptr = (boost::uint32_t*)&v; + std::size_t seed = *ptr; + return seed; + } + + inline std::size_t float_hash_impl(double v) + { + boost::uint32_t* ptr = (boost::uint32_t*)&v; + std::size_t seed = *ptr++; + hash_float_combine(seed, *ptr); + return seed; + } + + inline std::size_t float_hash_impl(long double v) + { + boost::uint32_t* ptr = (boost::uint32_t*)&v; + std::size_t seed = *ptr++; + hash_float_combine(seed, *ptr++); + hash_float_combine(seed, *(boost::uint16_t*)ptr); + return seed; + } + } +} + +#endif diff --git a/3rdParty/Boost/src/boost/functional/hash/detail/limits.hpp b/3rdParty/Boost/src/boost/functional/hash/detail/limits.hpp new file mode 100644 index 0000000..f5b520e --- /dev/null +++ b/3rdParty/Boost/src/boost/functional/hash/detail/limits.hpp @@ -0,0 +1,61 @@ + +// Copyright 2005-2009 Daniel James. +// Distributed under the Boost Software License, Version 1.0. (See accompanying +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +// +// On some platforms std::limits gives incorrect values for long double. +// This tries to work around them. + +#if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER) +#define BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma once +#endif + +#include <boost/limits.hpp> + +// On OpenBSD, numeric_limits is not reliable for long doubles, but +// the macros defined in <float.h> are and support long double when STLport +// doesn't. + +#if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE) +#include <float.h> +#endif + +namespace boost +{ + namespace hash_detail + { + template <class T> + struct limits : std::numeric_limits<T> {}; + +#if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE) + template <> + struct limits<long double> + : std::numeric_limits<long double> + { + static long double epsilon() { + return LDBL_EPSILON; + } + + static long double (max)() { + return LDBL_MAX; + } + + static long double (min)() { + return LDBL_MIN; + } + + BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG); + BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP); + BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP); +#if defined(_STLP_NO_LONG_DOUBLE) + BOOST_STATIC_CONSTANT(int, radix = FLT_RADIX); +#endif + }; +#endif // __OpenBSD__ + } +} + +#endif |