ceph/src/boost/boost/functional/hash/detail/limits.hpp

   1
   2 // Copyright 2005-2009 Daniel James.
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5 //
   6 // On some platforms std::limits gives incorrect values for long double.
   7 // This tries to work around them.
   8
   9 #if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER)
  10 #define BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER
  11
  12 #include <boost/config.hpp>
  13 #if defined(BOOST_HAS_PRAGMA_ONCE)
  14 #pragma once
  15 #endif
  16
  17 #include <boost/limits.hpp>
  18
  19 // On OpenBSD, numeric_limits is not reliable for long doubles, but
  20 // the macros defined in <float.h> are and support long double when STLport
  21 // doesn't.
  22
  23 #if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE)
  24 #include <float.h>
  25 #endif
  26
  27 namespace boost
  28 {
  29     namespace hash_detail
  30     {
  31         template <class T>
  32         struct limits : std::numeric_limits<T> {};
  33
  34 #if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE)
  35         template <>
  36         struct limits<long double>
  37              : std::numeric_limits<long double>
  38         {
  39             static long double epsilon() {
  40                 return LDBL_EPSILON;
  41             }
  42
  43             static long double (max)() {
  44                 return LDBL_MAX;
  45             }
  46
  47             static long double (min)() {
  48                 return LDBL_MIN;
  49             }
  50
  51             BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG);
  52             BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP);
  53             BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP);
  54 #if defined(_STLP_NO_LONG_DOUBLE)
  55             BOOST_STATIC_CONSTANT(int, radix = FLT_RADIX);
  56 #endif
  57         };
  58 #endif // __OpenBSD__
  59     }
  60 }
  61
  62 #endif