boost/integer_traits.hpp
/* boost integer_traits.hpp header file * * Copyright Jens Maurer 2000 * Permission to use, copy, modify, sell, and distribute this software * is hereby granted without fee provided that the above copyright notice * appears in all copies and that both that copyright notice and this * permission notice appear in supporting documentation, * * Jens Maurer makes no representations about the suitability of this * software for any purpose. It is provided "as is" without express or * implied warranty. * * $Id: integer_traits.hpp,v 1.23 2003/08/27 10:30:53 johnmaddock Exp $ * * Idea by Beman Dawes, Ed Brey, Steve Cleary, and Nathan Myers */ // See http://www.boost.org/libs/integer for documentation. #ifndef BOOST_INTEGER_TRAITS_HPP #define BOOST_INTEGER_TRAITS_HPP #include <boost/config.hpp> #include <boost/limits.hpp> // These are an implementation detail and not part of the interface #include <limits.h> #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) && !defined(BOOST_NO_CWCHAR) #include <wchar.h> #endif namespace boost { template<class T> class integer_traits : public std::numeric_limits<T> { public: BOOST_STATIC_CONSTANT(bool, is_integral = false); }; namespace detail { template<class T, T min_val, T max_val> class integer_traits_base { public: BOOST_STATIC_CONSTANT(bool, is_integral = true); BOOST_STATIC_CONSTANT(T, const_min = min_val); BOOST_STATIC_CONSTANT(T, const_max = max_val); }; #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION // A definition is required even for integral static constants template<class T, T min_val, T max_val> const bool integer_traits_base<T, min_val, max_val>::is_integral; template<class T, T min_val, T max_val> const T integer_traits_base<T, min_val, max_val>::const_min; template<class T, T min_val, T max_val> const T integer_traits_base<T, min_val, max_val>::const_max; #endif } // namespace detail template<> class integer_traits<bool> : public std::numeric_limits<bool>, public detail::integer_traits_base<bool, false, true> { }; template<> class integer_traits<char> : public std::numeric_limits<char>, public detail::integer_traits_base<char, CHAR_MIN, CHAR_MAX> { }; template<> class integer_traits<signed char> : public std::numeric_limits<signed char>, public detail::integer_traits_base<signed char, SCHAR_MIN, SCHAR_MAX> { }; template<> class integer_traits<unsigned char> : public std::numeric_limits<unsigned char>, public detail::integer_traits_base<unsigned char, 0, UCHAR_MAX> { }; #ifndef BOOST_NO_INTRINSIC_WCHAR_T template<> class integer_traits<wchar_t> : public std::numeric_limits<wchar_t>, #if defined(WCHAR_MIN) && defined(WCHAR_MAX) public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX> #elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__)) // No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned: public detail::integer_traits_base<wchar_t, 0, 0xffff> #elif (defined(__sgi) && (!defined(__SGI_STL_PORT) || __SGI_STL_PORT < 0x400))\ || (defined __APPLE__)\ || (defined(__OpenBSD__) && defined(__GNUC__))\ || (defined(__NetBSD__) && defined(__GNUC__))\ || (defined(__FreeBSD__) && defined(__GNUC__))\ || (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT)) // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int. // - SGI MIPSpro with native library // - gcc 3.x on HP-UX // - Mac OS X with native library // - gcc on FreeBSD, OpenBSD and NetBSD public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX> #elif defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 2) && !defined(__SGI_STL_PORT) // No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as unsigned int. // - gcc 2.95.x on HP-UX // (also, std::numeric_limits<wchar_t> appears to return the wrong values). public detail::integer_traits_base<wchar_t, 0, UINT_MAX> #else #error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler. #endif { }; #endif // BOOST_NO_INTRINSIC_WCHAR_T template<> class integer_traits<short> : public std::numeric_limits<short>, public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX> { }; template<> class integer_traits<unsigned short> : public std::numeric_limits<unsigned short>, public detail::integer_traits_base<unsigned short, 0, USHRT_MAX> { }; template<> class integer_traits<int> : public std::numeric_limits<int>, public detail::integer_traits_base<int, INT_MIN, INT_MAX> { }; template<> class integer_traits<unsigned int> : public std::numeric_limits<unsigned int>, public detail::integer_traits_base<unsigned int, 0, UINT_MAX> { }; template<> class integer_traits<long> : public std::numeric_limits<long>, public detail::integer_traits_base<long, LONG_MIN, LONG_MAX> { }; template<> class integer_traits<unsigned long> : public std::numeric_limits<unsigned long>, public detail::integer_traits_base<unsigned long, 0, ULONG_MAX> { }; #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T) #if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG) template<> class integer_traits<long long> : public std::numeric_limits<long long>, public detail::integer_traits_base<long long, LLONG_MIN, LLONG_MAX> { }; template<> class integer_traits<unsigned long long> : public std::numeric_limits<unsigned long long>, public detail::integer_traits_base<unsigned long long, 0, ULLONG_MAX> { }; #elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG) template<> class integer_traits<long long> : public std::numeric_limits<long long>, public detail::integer_traits_base<long long, LONG_LONG_MIN, LONG_LONG_MAX>{ }; template<> class integer_traits<unsigned long long> : public std::numeric_limits<unsigned long long>, public detail::integer_traits_base<unsigned long long, 0, ULONG_LONG_MAX> { }; #elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG) template<> class integer_traits<long long> : public std::numeric_limits<long long>, public detail::integer_traits_base<long long, LONGLONG_MIN, LONGLONG_MAX> { }; template<> class integer_traits<unsigned long long> : public std::numeric_limits<unsigned long long>, public detail::integer_traits_base<unsigned long long, 0, ULONGLONG_MAX> { }; #elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG) template<> class integer_traits<long long> : public std::numeric_limits<long long>, public detail::integer_traits_base<long long, -_LLONG_MAX - _C2, _LLONG_MAX> { }; template<> class integer_traits<unsigned long long> : public std::numeric_limits<unsigned long long>, public detail::integer_traits_base<unsigned long long, 0, _ULLONG_MAX> { }; #endif #endif } // namespace boost #endif /* BOOST_INTEGER_TRAITS_HPP */