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 1.23 2003/08/27 10:30:53 johnmaddock 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(__NetBSD__) && defined(__GNUC__))\
103 || (defined(__FreeBSD__) && defined(__GNUC__))\
104 || (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT))
105 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int.
106 // - SGI MIPSpro with native library
107 // - gcc 3.x on HP-UX
108 // - Mac OS X with native library
109 // - gcc on FreeBSD, OpenBSD and NetBSD
110 public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX>
111 #elif defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 2) && !defined(__SGI_STL_PORT)
112 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as unsigned int.
113 // - gcc 2.95.x on HP-UX
114 // (also, std::numeric_limits<wchar_t> appears to return the wrong values).
115 public detail::integer_traits_base<wchar_t, 0, UINT_MAX>
117 #error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler.
120 #endif // BOOST_NO_INTRINSIC_WCHAR_T
123 class integer_traits<short>
124 : public std::numeric_limits<short>,
125 public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX>
129 class integer_traits<unsigned short>
130 : public std::numeric_limits<unsigned short>,
131 public detail::integer_traits_base<unsigned short, 0, USHRT_MAX>
135 class integer_traits<int>
136 : public std::numeric_limits<int>,
137 public detail::integer_traits_base<int, INT_MIN, INT_MAX>
141 class integer_traits<unsigned int>
142 : public std::numeric_limits<unsigned int>,
143 public detail::integer_traits_base<unsigned int, 0, UINT_MAX>
147 class integer_traits<long>
148 : public std::numeric_limits<long>,
149 public detail::integer_traits_base<long, LONG_MIN, LONG_MAX>
153 class integer_traits<unsigned long>
154 : public std::numeric_limits<unsigned long>,
155 public detail::integer_traits_base<unsigned long, 0, ULONG_MAX>
158 #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T)
159 #if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
162 class integer_traits<long long>
163 : public std::numeric_limits<long long>,
164 public detail::integer_traits_base<long long, LLONG_MIN, LLONG_MAX>
168 class integer_traits<unsigned long long>
169 : public std::numeric_limits<unsigned long long>,
170 public detail::integer_traits_base<unsigned long long, 0, ULLONG_MAX>
173 #elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG)
176 class integer_traits<long long> : public std::numeric_limits<long long>, public detail::integer_traits_base<long long, LONG_LONG_MIN, LONG_LONG_MAX>{ };
178 class integer_traits<unsigned long long>
179 : public std::numeric_limits<unsigned long long>,
180 public detail::integer_traits_base<unsigned long long, 0, ULONG_LONG_MAX>
183 #elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
186 class integer_traits<long long>
187 : public std::numeric_limits<long long>,
188 public detail::integer_traits_base<long long, LONGLONG_MIN, LONGLONG_MAX>
192 class integer_traits<unsigned long long>
193 : public std::numeric_limits<unsigned long long>,
194 public detail::integer_traits_base<unsigned long long, 0, ULONGLONG_MAX>
197 #elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG)
200 class integer_traits<long long>
201 : public std::numeric_limits<long long>,
202 public detail::integer_traits_base<long long, -_LLONG_MAX - _C2, _LLONG_MAX>
206 class integer_traits<unsigned long long>
207 : public std::numeric_limits<unsigned long long>,
208 public detail::integer_traits_base<unsigned long long, 0, _ULLONG_MAX>
216 #endif /* BOOST_INTEGER_TRAITS_HPP */