forked from boostorg/functional
Daniel James
e655314f73
The only template mechanism now used is full specialization, so this should hopefully be more portable to compilers we don't test. [SVN r53247]
62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
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// Copyright 2005-2009 Daniel James.
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// On some platforms std::limits gives incorrect values for long double.
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// This tries to work around them.
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#if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER)
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#define BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER
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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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#include <boost/limits.hpp>
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// On OpenBSD, numeric_limits is not reliable for long doubles, but
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// the macros defined in <float.h> are and support long double when STLport
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// doesn't.
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#if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE)
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#include <float.h>
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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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template <class T>
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struct limits : std::numeric_limits<T> {};
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#if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE)
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template <>
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struct limits<long double>
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: std::numeric_limits<long double>
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{
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static long double epsilon() {
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return LDBL_EPSILON;
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}
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static long double (max)() {
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return LDBL_MAX;
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}
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static long double (min)() {
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return LDBL_MIN;
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}
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BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG);
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BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP);
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BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP);
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#if defined(_STLP_NO_LONG_DOUBLE)
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BOOST_STATIC_CONSTANT(int, radix = FLT_RADIX);
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#endif
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};
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#endif // __OpenBSD__
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}
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}
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#endif
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