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// 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)
#if !defined(FBOOST_FUNCTIONAL_HASH_DETAIL_FLOAT_FUNCTIONS_HPP)
#define FBOOST_FUNCTIONAL_HASH_DETAIL_FLOAT_FUNCTIONS_HPP
#include <boost/config/no_tr1/cmath.hpp>
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
// 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
// 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:
//
// 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
namespace gboost
{
namespace hash_detail
{
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
}
inline double call_ldexp(double v, int exp)
{
using namespace std;
return ldexp(v, exp);
}
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);
#else
return ldexpl(v, exp);
#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);
#else
return frexpf(v, exp);
#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);
#else
return frexpl(v, exp);
#endif
}
}
}
#if defined(BOOST_HASH_USE_C99_FLOAT_FUNCS)
#undef BOOST_HASH_USE_C99_FLOAT_FUNCS
#endif
#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS)
#undef BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS
#endif
#if defined(BOOST_HASH_C99_NO_FLOAT_FUNCS)
#undef BOOST_HASH_C99_NO_FLOAT_FUNCS
#endif
#endif
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