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 1.19.4.1 2002/09/24 11:38:33 johnmaddock Exp $
15 * Idea by Beman Dawes, Ed Brey, Steve Cleary, and Nathan Myers
18 #ifndef BOOST_INTEGER_TRAITS_HPP
19 #define BOOST_INTEGER_TRAITS_HPP
21 #include <boost/config.hpp>
22 #include <boost/limits.hpp>
24 // These are an implementation detail and not part of the interface
26 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) && !defined(BOOST_NO_CWCHAR)
33 class integer_traits : public std::numeric_limits<T>
36 BOOST_STATIC_CONSTANT(bool, is_integral = false);
40 template<class T, T min_val, T max_val>
41 class integer_traits_base
44 BOOST_STATIC_CONSTANT(bool, is_integral = true);
45 BOOST_STATIC_CONSTANT(T, const_min = min_val);
46 BOOST_STATIC_CONSTANT(T, const_max = max_val);
49 #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
50 // A definition is required even for integral static constants
51 template<class T, T min_val, T max_val>
52 const bool integer_traits_base<T, min_val, max_val>::is_integral;
54 template<class T, T min_val, T max_val>
55 const T integer_traits_base<T, min_val, max_val>::const_min;
57 template<class T, T min_val, T max_val>
58 const T integer_traits_base<T, min_val, max_val>::const_max;
64 class integer_traits<bool>
65 : public std::numeric_limits<bool>,
66 public detail::integer_traits_base<bool, false, true>
70 class integer_traits<char>
71 : public std::numeric_limits<char>,
72 public detail::integer_traits_base<char, CHAR_MIN, CHAR_MAX>
76 class integer_traits<signed char>
77 : public std::numeric_limits<signed char>,
78 public detail::integer_traits_base<signed char, SCHAR_MIN, SCHAR_MAX>
82 class integer_traits<unsigned char>
83 : public std::numeric_limits<unsigned char>,
84 public detail::integer_traits_base<unsigned char, 0, UCHAR_MAX>
87 #ifndef BOOST_NO_INTRINSIC_WCHAR_T
89 class integer_traits<wchar_t>
90 : public std::numeric_limits<wchar_t>,
91 #if defined(WCHAR_MIN) && defined(WCHAR_MAX)
92 public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX>
93 #elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__))
94 // No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned:
95 public detail::integer_traits_base<wchar_t, 0, 0xffff>
96 #elif (defined(__sgi) && (!defined(__SGI_STL_PORT) || __SGI_STL_PORT < 0x400)) || (defined __APPLE__) || (defined(__FreeBSD__) && defined(__GNUC__)) || (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT))
97 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int.
98 // - SGI MIPSpro with native library
100 // - Mac OS X with native library
102 public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX>
103 #elif defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 2) && !defined(__SGI_STL_PORT)
104 // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as unsigned int.
105 // - gcc 2.95.x on HP-UX
106 // (also, std::numeric_limits<wchar_t> appears to return the wrong values).
107 public detail::integer_traits_base<wchar_t, 0, UINT_MAX>
109 #error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler.
112 #endif // BOOST_NO_INTRINSIC_WCHAR_T
115 class integer_traits<short>
116 : public std::numeric_limits<short>,
117 public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX>
121 class integer_traits<unsigned short>
122 : public std::numeric_limits<unsigned short>,
123 public detail::integer_traits_base<unsigned short, 0, USHRT_MAX>
127 class integer_traits<int>
128 : public std::numeric_limits<int>,
129 public detail::integer_traits_base<int, INT_MIN, INT_MAX>
133 class integer_traits<unsigned int>
134 : public std::numeric_limits<unsigned int>,
135 public detail::integer_traits_base<unsigned int, 0, UINT_MAX>
139 class integer_traits<long>
140 : public std::numeric_limits<long>,
141 public detail::integer_traits_base<long, LONG_MIN, LONG_MAX>
145 class integer_traits<unsigned long>
146 : public std::numeric_limits<unsigned long>,
147 public detail::integer_traits_base<unsigned long, 0, ULONG_MAX>
150 #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T)
151 #if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
154 class integer_traits<long long>
155 : public std::numeric_limits<long long>,
156 public detail::integer_traits_base<long long, LLONG_MIN, LLONG_MAX>
160 class integer_traits<unsigned long long>
161 : public std::numeric_limits<unsigned long long>,
162 public detail::integer_traits_base<unsigned long long, 0, ULLONG_MAX>
165 #elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG)
168 class integer_traits<long long> : public std::numeric_limits<long long>, public detail::integer_traits_base<long long, LONG_LONG_MIN, LONG_LONG_MAX>{ };
170 class integer_traits<unsigned long long>
171 : public std::numeric_limits<unsigned long long>,
172 public detail::integer_traits_base<unsigned long long, 0, ULONG_LONG_MAX>
175 #elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
178 class integer_traits<long long>
179 : public std::numeric_limits<long long>,
180 public detail::integer_traits_base<long long, LONGLONG_MIN, LONGLONG_MAX>
184 class integer_traits<unsigned long long>
185 : public std::numeric_limits<unsigned long long>,
186 public detail::integer_traits_base<unsigned long long, 0, ULONGLONG_MAX>
189 #elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG)
192 class integer_traits<long long>
193 : public std::numeric_limits<long long>,
194 public detail::integer_traits_base<long long, -_LLONG_MAX - _C2, _LLONG_MAX>
198 class integer_traits<unsigned long long>
199 : public std::numeric_limits<unsigned long long>,
200 public detail::integer_traits_base<unsigned long long, 0, _ULLONG_MAX>
208 #endif /* BOOST_INTEGER_TRAITS_HPP */