1 /* boost integer_traits.hpp header file
3 * Copyright Jens Maurer 2000
4 * Distributed under the Boost Software License, Version 1.0. (See
5 * accompanying file LICENSE_1_0.txt or copy at
6 * http://www.boost.org/LICENSE_1_0.txt)
8 * $Id: integer_traits.hpp 85813 2013-09-21 20:17:00Z jewillco $
10 * Idea by Beman Dawes, Ed Brey, Steve Cleary, and Nathan Myers
13 // See http://www.boost.org/libs/integer for documentation.
16 #ifndef BOOST_INTEGER_TRAITS_HPP
17 #define BOOST_INTEGER_TRAITS_HPP
19 #include <boost/config.hpp>
20 #include <boost/limits.hpp>
22 // These are an implementation detail and not part of the interface
24 // we need wchar.h for WCHAR_MAX/MIN but not all platforms provide it,
25 // and some may have <wchar.h> but not <cwchar> ...
26 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) && (!defined(BOOST_NO_CWCHAR) || defined(sun) || defined(__sun) || defined(__QNX__))
31 // We simply cannot include this header on gcc without getting copious warnings of the kind:
33 // ../../../boost/integer_traits.hpp:164:66: warning: use of C99 long long integer constant
35 // And yet there is no other reasonable implementation, so we declare this a system header
36 // to suppress these warnings.
38 #if defined(__GNUC__) && (__GNUC__ >= 4)
39 #pragma GCC system_header
44 class integer_traits : public std::numeric_limits<T>
47 BOOST_STATIC_CONSTANT(bool, is_integral = false);
51 template<class T, T min_val, T max_val>
52 class integer_traits_base
55 BOOST_STATIC_CONSTANT(bool, is_integral = true);
56 BOOST_STATIC_CONSTANT(T, const_min = min_val);
57 BOOST_STATIC_CONSTANT(T, const_max = max_val);
60 #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
61 // A definition is required even for integral static constants
62 template<class T, T min_val, T max_val>
63 const bool integer_traits_base<T, min_val, max_val>::is_integral;
65 template<class T, T min_val, T max_val>
66 const T integer_traits_base<T, min_val, max_val>::const_min;
68 template<class T, T min_val, T max_val>
69 const T integer_traits_base<T, min_val, max_val>::const_max;
75 class integer_traits<bool>
76 : public std::numeric_limits<bool>,
77 public detail::integer_traits_base<bool, false, true>
81 class integer_traits<char>
82 : public std::numeric_limits<char>,
83 public detail::integer_traits_base<char, CHAR_MIN, CHAR_MAX>
87 class integer_traits<signed char>
88 : public std::numeric_limits<signed char>,
89 public detail::integer_traits_base<signed char, SCHAR_MIN, SCHAR_MAX>
93 class integer_traits<unsigned char>
94 : public std::numeric_limits<unsigned char>,
95 public detail::integer_traits_base<unsigned char, 0, UCHAR_MAX>
98 #ifndef BOOST_NO_INTRINSIC_WCHAR_T
100 class integer_traits<wchar_t>
101 : public std::numeric_limits<wchar_t>,
102 // Don't trust WCHAR_MIN and WCHAR_MAX with Mac OS X's native
103 // library: they are wrong!
104 #if defined(WCHAR_MIN) && defined(WCHAR_MAX) && !defined(__APPLE__)
105 public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX>
106 #elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__))
107 // No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned:
108 public detail::integer_traits_base<wchar_t, 0, 0xffff>
109 #elif (defined(__sgi) && (!defined(__SGI_STL_PORT) || __SGI_STL_PORT < 0x400))\
110 || (defined __APPLE__)\
111 || (defined(__OpenBSD__) && defined(__GNUC__))\
112 || (defined(__NetBSD__) && defined(__GNUC__))\
113 || (defined(__FreeBSD__) && defined(__GNUC__))\
114 || (defined(__DragonFly__) && defined(__GNUC__))\
115 || (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT))
116 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int.
117 // - SGI MIPSpro with native library
118 // - gcc 3.x on HP-UX
119 // - Mac OS X with native library
120 // - gcc on FreeBSD, OpenBSD and NetBSD
121 public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX>
122 #elif defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 2) && !defined(__SGI_STL_PORT)
123 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as unsigned int.
124 // - gcc 2.95.x on HP-UX
125 // (also, std::numeric_limits<wchar_t> appears to return the wrong values).
126 public detail::integer_traits_base<wchar_t, 0, UINT_MAX>
128 #error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler.
131 #endif // BOOST_NO_INTRINSIC_WCHAR_T
134 class integer_traits<short>
135 : public std::numeric_limits<short>,
136 public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX>
140 class integer_traits<unsigned short>
141 : public std::numeric_limits<unsigned short>,
142 public detail::integer_traits_base<unsigned short, 0, USHRT_MAX>
146 class integer_traits<int>
147 : public std::numeric_limits<int>,
148 public detail::integer_traits_base<int, INT_MIN, INT_MAX>
152 class integer_traits<unsigned int>
153 : public std::numeric_limits<unsigned int>,
154 public detail::integer_traits_base<unsigned int, 0, UINT_MAX>
158 class integer_traits<long>
159 : public std::numeric_limits<long>,
160 public detail::integer_traits_base<long, LONG_MIN, LONG_MAX>
164 class integer_traits<unsigned long>
165 : public std::numeric_limits<unsigned long>,
166 public detail::integer_traits_base<unsigned long, 0, ULONG_MAX>
169 #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T)
170 #if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
173 class integer_traits< ::boost::long_long_type>
174 : public std::numeric_limits< ::boost::long_long_type>,
175 public detail::integer_traits_base< ::boost::long_long_type, LLONG_MIN, LLONG_MAX>
179 class integer_traits< ::boost::ulong_long_type>
180 : public std::numeric_limits< ::boost::ulong_long_type>,
181 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULLONG_MAX>
184 #elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG)
187 class integer_traits< ::boost::long_long_type> : public std::numeric_limits< ::boost::long_long_type>, public detail::integer_traits_base< ::boost::long_long_type, LONG_LONG_MIN, LONG_LONG_MAX>{ };
189 class integer_traits< ::boost::ulong_long_type>
190 : public std::numeric_limits< ::boost::ulong_long_type>,
191 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONG_LONG_MAX>
194 #elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
197 class integer_traits< ::boost::long_long_type>
198 : public std::numeric_limits< ::boost::long_long_type>,
199 public detail::integer_traits_base< ::boost::long_long_type, LONGLONG_MIN, LONGLONG_MAX>
203 class integer_traits< ::boost::ulong_long_type>
204 : public std::numeric_limits< ::boost::ulong_long_type>,
205 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONGLONG_MAX>
208 #elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG)
211 class integer_traits< ::boost::long_long_type>
212 : public std::numeric_limits< ::boost::long_long_type>,
213 public detail::integer_traits_base< ::boost::long_long_type, -_LLONG_MAX - _C2, _LLONG_MAX>
217 class integer_traits< ::boost::ulong_long_type>
218 : public std::numeric_limits< ::boost::ulong_long_type>,
219 public detail::integer_traits_base< ::boost::ulong_long_type, 0, _ULLONG_MAX>
222 #elif defined(BOOST_HAS_LONG_LONG)
224 // we have long long but no constants, this happens for example with gcc in -ansi mode,
225 // we'll just have to work out the values for ourselves (assumes 2's compliment representation):
228 class integer_traits< ::boost::long_long_type>
229 : public std::numeric_limits< ::boost::long_long_type>,
230 public detail::integer_traits_base< ::boost::long_long_type, (1LL << (sizeof(::boost::long_long_type) * CHAR_BIT - 1)), ~(1LL << (sizeof(::boost::long_long_type) * CHAR_BIT - 1))>
234 class integer_traits< ::boost::ulong_long_type>
235 : public std::numeric_limits< ::boost::ulong_long_type>,
236 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ~0uLL>
239 #elif defined(BOOST_HAS_MS_INT64)
242 class integer_traits< __int64>
243 : public std::numeric_limits< __int64>,
244 public detail::integer_traits_base< __int64, _I64_MIN, _I64_MAX>
248 class integer_traits< unsigned __int64>
249 : public std::numeric_limits< unsigned __int64>,
250 public detail::integer_traits_base< unsigned __int64, 0, _UI64_MAX>
258 #endif /* BOOST_INTEGER_TRAITS_HPP */