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61 lines
1.6 KiB
61 lines
1.6 KiB
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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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