Chris@16: 
Chris@16: // Copyright 2005-2009 Daniel James.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // On some platforms std::limits gives incorrect values for long double.
Chris@16: // This tries to work around them.
Chris@16: 
Chris@16: #if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER)
Chris@16: #define BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER
Chris@16: 
Chris@101: #include <boost/config.hpp>
Chris@101: #if defined(BOOST_HAS_PRAGMA_ONCE)
Chris@101: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/limits.hpp>
Chris@16: 
Chris@16: // On OpenBSD, numeric_limits is not reliable for long doubles, but
Chris@16: // the macros defined in <float.h> are and support long double when STLport
Chris@16: // doesn't.
Chris@16: 
Chris@16: #if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE)
Chris@16: #include <float.h>
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace hash_detail
Chris@16:     {
Chris@16:         template <class T>
Chris@16:         struct limits : std::numeric_limits<T> {};
Chris@16: 
Chris@16: #if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE)
Chris@16:         template <>
Chris@16:         struct limits<long double>
Chris@16:              : std::numeric_limits<long double>
Chris@16:         {
Chris@16:             static long double epsilon() {
Chris@16:                 return LDBL_EPSILON;
Chris@16:             }
Chris@16: 
Chris@16:             static long double (max)() {
Chris@16:                 return LDBL_MAX;
Chris@16:             }
Chris@16: 
Chris@16:             static long double (min)() {
Chris@16:                 return LDBL_MIN;
Chris@16:             }
Chris@16: 
Chris@16:             BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG);
Chris@16:             BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP);
Chris@16:             BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP);
Chris@16: #if defined(_STLP_NO_LONG_DOUBLE)
Chris@16:             BOOST_STATIC_CONSTANT(int, radix = FLT_RADIX);
Chris@16: #endif
Chris@16:         };
Chris@16: #endif // __OpenBSD__
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: #endif