1 /* boost integer_traits.hpp header file
3 * Copyright Jens Maurer 2000
4 * Permission to use, copy, modify, sell, and distribute this software
5 * is hereby granted without fee provided that the above copyright notice
6 * appears in all copies and that both that copyright notice and this
7 * permission notice appear in supporting documentation,
9 * Jens Maurer makes no representations about the suitability of this
10 * software for any purpose. It is provided "as is" without express or
13 * $Id: integer_traits.hpp,v 1.22 2002/12/27 16:51:52 beman_dawes Exp $
15 * Idea by Beman Dawes, Ed Brey, Steve Cleary, and Nathan Myers
18 // See http://www.boost.org/libs/integer for documentation.
21 #ifndef BOOST_INTEGER_TRAITS_HPP
22 #define BOOST_INTEGER_TRAITS_HPP
24 #include <boost/config.hpp>
25 #include <boost/limits.hpp>
27 // These are an implementation detail and not part of the interface
29 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) && !defined(BOOST_NO_CWCHAR)
36 class integer_traits : public std::numeric_limits<T>
39 BOOST_STATIC_CONSTANT(bool, is_integral = false);
43 template<class T, T min_val, T max_val>
44 class integer_traits_base
47 BOOST_STATIC_CONSTANT(bool, is_integral = true);
48 BOOST_STATIC_CONSTANT(T, const_min = min_val);
49 BOOST_STATIC_CONSTANT(T, const_max = max_val);
52 #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
53 // A definition is required even for integral static constants
54 template<class T, T min_val, T max_val>
55 const bool integer_traits_base<T, min_val, max_val>::is_integral;
57 template<class T, T min_val, T max_val>
58 const T integer_traits_base<T, min_val, max_val>::const_min;
60 template<class T, T min_val, T max_val>
61 const T integer_traits_base<T, min_val, max_val>::const_max;
67 class integer_traits<bool>
68 : public std::numeric_limits<bool>,
69 public detail::integer_traits_base<bool, false, true>
73 class integer_traits<char>
74 : public std::numeric_limits<char>,
75 public detail::integer_traits_base<char, CHAR_MIN, CHAR_MAX>
79 class integer_traits<signed char>
80 : public std::numeric_limits<signed char>,
81 public detail::integer_traits_base<signed char, SCHAR_MIN, SCHAR_MAX>
85 class integer_traits<unsigned char>
86 : public std::numeric_limits<unsigned char>,
87 public detail::integer_traits_base<unsigned char, 0, UCHAR_MAX>
90 #ifndef BOOST_NO_INTRINSIC_WCHAR_T
92 class integer_traits<wchar_t>
93 : public std::numeric_limits<wchar_t>,
94 #if defined(WCHAR_MIN) && defined(WCHAR_MAX)
95 public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX>
96 #elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__))
97 // No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned:
98 public detail::integer_traits_base<wchar_t, 0, 0xffff>
99 #elif (defined(__sgi) && (!defined(__SGI_STL_PORT) || __SGI_STL_PORT < 0x400))\
100 || (defined __APPLE__)\
101 || (defined(__OpenBSD__) && defined(__GNUC__))\
102 || (defined(__FreeBSD__) && defined(__GNUC__))\
103 || (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT))
104 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int.
105 // - SGI MIPSpro with native library
106 // - gcc 3.x on HP-UX
107 // - Mac OS X with native library
109 public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX>
110 #elif defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 2) && !defined(__SGI_STL_PORT)
111 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as unsigned int.
112 // - gcc 2.95.x on HP-UX
113 // (also, std::numeric_limits<wchar_t> appears to return the wrong values).
114 public detail::integer_traits_base<wchar_t, 0, UINT_MAX>
116 #error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler.
119 #endif // BOOST_NO_INTRINSIC_WCHAR_T
122 class integer_traits<short>
123 : public std::numeric_limits<short>,
124 public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX>
128 class integer_traits<unsigned short>
129 : public std::numeric_limits<unsigned short>,
130 public detail::integer_traits_base<unsigned short, 0, USHRT_MAX>
134 class integer_traits<int>
135 : public std::numeric_limits<int>,
136 public detail::integer_traits_base<int, INT_MIN, INT_MAX>
140 class integer_traits<unsigned int>
141 : public std::numeric_limits<unsigned int>,
142 public detail::integer_traits_base<unsigned int, 0, UINT_MAX>
146 class integer_traits<long>
147 : public std::numeric_limits<long>,
148 public detail::integer_traits_base<long, LONG_MIN, LONG_MAX>
152 class integer_traits<unsigned long>
153 : public std::numeric_limits<unsigned long>,
154 public detail::integer_traits_base<unsigned long, 0, ULONG_MAX>
157 #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T)
158 #if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
161 class integer_traits<long long>
162 : public std::numeric_limits<long long>,
163 public detail::integer_traits_base<long long, LLONG_MIN, LLONG_MAX>
167 class integer_traits<unsigned long long>
168 : public std::numeric_limits<unsigned long long>,
169 public detail::integer_traits_base<unsigned long long, 0, ULLONG_MAX>
172 #elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG)
175 class integer_traits<long long> : public std::numeric_limits<long long>, public detail::integer_traits_base<long long, LONG_LONG_MIN, LONG_LONG_MAX>{ };
177 class integer_traits<unsigned long long>
178 : public std::numeric_limits<unsigned long long>,
179 public detail::integer_traits_base<unsigned long long, 0, ULONG_LONG_MAX>
182 #elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
185 class integer_traits<long long>
186 : public std::numeric_limits<long long>,
187 public detail::integer_traits_base<long long, LONGLONG_MIN, LONGLONG_MAX>
191 class integer_traits<unsigned long long>
192 : public std::numeric_limits<unsigned long long>,
193 public detail::integer_traits_base<unsigned long long, 0, ULONGLONG_MAX>
196 #elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG)
199 class integer_traits<long long>
200 : public std::numeric_limits<long long>,
201 public detail::integer_traits_base<long long, -_LLONG_MAX - _C2, _LLONG_MAX>
205 class integer_traits<unsigned long long>
206 : public std::numeric_limits<unsigned long long>,
207 public detail::integer_traits_base<unsigned long long, 0, _ULLONG_MAX>
215 #endif /* BOOST_INTEGER_TRAITS_HPP */