forked from boostorg/container_hash
123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
// (C) Copyright Daniel James 2005.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#if !defined(BOOST_FUNCTIONAL_DETAIL_FLOAT_FUNCTIONS_HPP)
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#define BOOST_FUNCTIONAL_DETAIL_FLOAT_FUNCTIONS_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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// The C++ standard requires that the C float functions are overloarded
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// for float, double and long double in the std namespace, but some of the older
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// library implementations don't support this. On some that don't, the C99
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// float functions (frexpf, frexpl, etc.) are available.
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// This is just based on the compilers I've got access to, but it should
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// do something sensible on most compilers.
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#if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
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# if defined(BOOST_MSVC) && BOOST_MSVC <= 1200
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# define BOOST_HASH_USE_C99_FLOAT_FUNCS
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# else
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# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS
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# endif
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#elif defined(_RWSTD_VER) && defined(__BORLANDC__)
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# define BOOST_HASH_USE_C99_FLOAT_FUNCS
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# define BOOST_HASH_C99_NO_FLOAT_FUNCS
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#elif defined(__GLIBCPP__) || defined(__GLIBCXX__)
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# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS
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#elif defined(__STL_CONFIG_H)
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// This might just be for gcc-2.95
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// And cygwin might not have the C99 functions
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# define BOOST_HASH_USE_C99_FLOAT_FUNCS
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#elif (defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER)
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// Overloaded float functions were probably introduced at an earlier version.
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# if defined(_CPPLIB_VER) && (_CPPLIB_VER >= 402)
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# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS
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# else
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# define BOOST_HASH_USE_C99_FLOAT_FUNCS
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# endif
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#elif defined(__DMC__)
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# define BOOST_HASH_USE_C99_FLOAT_FUNCS
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#else
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# define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS
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#endif
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namespace boost
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{
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namespace hash_detail
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{
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inline float call_ldexp(float v, int exp)
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{
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using namespace std;
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#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS) || \
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defined(BOOST_HASH_C99_NO_FLOAT_FUNCS)
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return ldexp(v, exp);
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#else
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return ldexpf(v, exp);
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#endif
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}
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inline double call_ldexp(double v, int exp)
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{
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using namespace std;
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return ldexp(v, exp);
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}
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inline long double call_ldexp(long double v, int exp)
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{
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using namespace std;
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#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS)
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return ldexp(v, exp);
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#else
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return ldexpl(v, exp);
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#endif
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}
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inline float call_frexp(float v, int* exp)
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{
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using namespace std;
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#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS) || \
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defined(BOOST_HASH_C99_NO_FLOAT_FUNCS)
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return frexp(v, exp);
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#else
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return frexpf(v, exp);
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#endif
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}
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inline double call_frexp(double v, int* exp)
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{
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using namespace std;
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return frexp(v, exp);
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}
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inline long double call_frexp(long double v, int* exp)
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{
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using namespace std;
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#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS)
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return frexp(v, exp);
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#else
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return frexpl(v, exp);
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#endif
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}
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}
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}
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#if defined(BOOST_HASH_USE_C99_FLOAT_FUNCS)
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#undef BOOST_HASH_USE_C99_FLOAT_FUNCS
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#endif
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#if defined(BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS)
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#undef BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS
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#endif
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#if defined(BOOST_HASH_C99_NO_FLOAT_FUNCS)
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#undef BOOST_HASH_C99_NO_FLOAT_FUNCS
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#endif
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#endif
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