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,v 1.25 2004/09/04 10:34:47 johnmaddock Exp $
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 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) && !defined(BOOST_NO_CWCHAR)
31 class integer_traits : public std::numeric_limits<T>
34 BOOST_STATIC_CONSTANT(bool, is_integral = false);
38 template<class T, T min_val, T max_val>
39 class integer_traits_base
42 BOOST_STATIC_CONSTANT(bool, is_integral = true);
43 BOOST_STATIC_CONSTANT(T, const_min = min_val);
44 BOOST_STATIC_CONSTANT(T, const_max = max_val);
47 #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
48 // A definition is required even for integral static constants
49 template<class T, T min_val, T max_val>
50 const bool integer_traits_base<T, min_val, max_val>::is_integral;
52 template<class T, T min_val, T max_val>
53 const T integer_traits_base<T, min_val, max_val>::const_min;
55 template<class T, T min_val, T max_val>
56 const T integer_traits_base<T, min_val, max_val>::const_max;
62 class integer_traits<bool>
63 : public std::numeric_limits<bool>,
64 public detail::integer_traits_base<bool, false, true>
68 class integer_traits<char>
69 : public std::numeric_limits<char>,
70 public detail::integer_traits_base<char, CHAR_MIN, CHAR_MAX>
74 class integer_traits<signed char>
75 : public std::numeric_limits<signed char>,
76 public detail::integer_traits_base<signed char, SCHAR_MIN, SCHAR_MAX>
80 class integer_traits<unsigned char>
81 : public std::numeric_limits<unsigned char>,
82 public detail::integer_traits_base<unsigned char, 0, UCHAR_MAX>
85 #ifndef BOOST_NO_INTRINSIC_WCHAR_T
87 class integer_traits<wchar_t>
88 : public std::numeric_limits<wchar_t>,
89 #if defined(WCHAR_MIN) && defined(WCHAR_MAX)
90 public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX>
91 #elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__))
92 // No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned:
93 public detail::integer_traits_base<wchar_t, 0, 0xffff>
94 #elif (defined(__sgi) && (!defined(__SGI_STL_PORT) || __SGI_STL_PORT < 0x400))\
95 || (defined __APPLE__)\
96 || (defined(__OpenBSD__) && defined(__GNUC__))\
97 || (defined(__NetBSD__) && defined(__GNUC__))\
98 || (defined(__FreeBSD__) && defined(__GNUC__))\
99 || (defined(__DragonFly__) && defined(__GNUC__))\
100 || (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT))
101 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int.
102 // - SGI MIPSpro with native library
103 // - gcc 3.x on HP-UX
104 // - Mac OS X with native library
105 // - gcc on FreeBSD, OpenBSD and NetBSD
106 public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX>
107 #elif defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 2) && !defined(__SGI_STL_PORT)
108 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as unsigned int.
109 // - gcc 2.95.x on HP-UX
110 // (also, std::numeric_limits<wchar_t> appears to return the wrong values).
111 public detail::integer_traits_base<wchar_t, 0, UINT_MAX>
113 #error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler.
116 #endif // BOOST_NO_INTRINSIC_WCHAR_T
119 class integer_traits<short>
120 : public std::numeric_limits<short>,
121 public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX>
125 class integer_traits<unsigned short>
126 : public std::numeric_limits<unsigned short>,
127 public detail::integer_traits_base<unsigned short, 0, USHRT_MAX>
131 class integer_traits<int>
132 : public std::numeric_limits<int>,
133 public detail::integer_traits_base<int, INT_MIN, INT_MAX>
137 class integer_traits<unsigned int>
138 : public std::numeric_limits<unsigned int>,
139 public detail::integer_traits_base<unsigned int, 0, UINT_MAX>
143 class integer_traits<long>
144 : public std::numeric_limits<long>,
145 public detail::integer_traits_base<long, LONG_MIN, LONG_MAX>
149 class integer_traits<unsigned long>
150 : public std::numeric_limits<unsigned long>,
151 public detail::integer_traits_base<unsigned long, 0, ULONG_MAX>
154 #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T)
155 #if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
158 class integer_traits< ::boost::long_long_type>
159 : public std::numeric_limits< ::boost::long_long_type>,
160 public detail::integer_traits_base< ::boost::long_long_type, LLONG_MIN, LLONG_MAX>
164 class integer_traits< ::boost::ulong_long_type>
165 : public std::numeric_limits< ::boost::ulong_long_type>,
166 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULLONG_MAX>
169 #elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG)
172 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>{ };
174 class integer_traits< ::boost::ulong_long_type>
175 : public std::numeric_limits< ::boost::ulong_long_type>,
176 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONG_LONG_MAX>
179 #elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
182 class integer_traits< ::boost::long_long_type>
183 : public std::numeric_limits< ::boost::long_long_type>,
184 public detail::integer_traits_base< ::boost::long_long_type, LONGLONG_MIN, LONGLONG_MAX>
188 class integer_traits< ::boost::ulong_long_type>
189 : public std::numeric_limits< ::boost::ulong_long_type>,
190 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONGLONG_MAX>
193 #elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG)
196 class integer_traits< ::boost::long_long_type>
197 : public std::numeric_limits< ::boost::long_long_type>,
198 public detail::integer_traits_base< ::boost::long_long_type, -_LLONG_MAX - _C2, _LLONG_MAX>
202 class integer_traits< ::boost::ulong_long_type>
203 : public std::numeric_limits< ::boost::ulong_long_type>,
204 public detail::integer_traits_base< ::boost::ulong_long_type, 0, _ULLONG_MAX>
207 #elif defined(BOOST_HAS_LONG_LONG)
209 // we have long long but no constants, this happens for example with gcc in -ansi mode,
210 // we'll just have to work out the values for ourselves (assumes 2's compliment representation):
213 class integer_traits< ::boost::long_long_type>
214 : public std::numeric_limits< ::boost::long_long_type>,
215 public detail::integer_traits_base< ::boost::long_long_type, (1LL << (sizeof(::boost::long_long_type) - 1)), ~(1LL << (sizeof(::boost::long_long_type) - 1))>
219 class integer_traits< ::boost::ulong_long_type>
220 : public std::numeric_limits< ::boost::ulong_long_type>,
221 public detail::integer_traits_base< ::boost::ulong_long_type, 0, ~0uLL>
229 #endif /* BOOST_INTEGER_TRAITS_HPP */