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
27namespace 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
63

source code of include/boost/container_hash/detail/limits.hpp