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https://github.com/boostorg/integer.git
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257 lines
8.1 KiB
C++
257 lines
8.1 KiB
C++
/* boost integer_traits.hpp header file
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*
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* Copyright Jens Maurer 2000
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* Distributed under the Boost Software License, Version 1.0. (See
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* accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* $Id$
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*
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* Idea by Beman Dawes, Ed Brey, Steve Cleary, and Nathan Myers
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*/
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// See http://www.boost.org/libs/integer for documentation.
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#ifndef BOOST_INTEGER_TRAITS_HPP
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#define BOOST_INTEGER_TRAITS_HPP
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#include <boost/config.hpp>
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#include <boost/limits.hpp>
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// These are an implementation detail and not part of the interface
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#include <limits.h>
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// we need wchar.h for WCHAR_MAX/MIN but not all platforms provide it,
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// and some may have <wchar.h> but not <cwchar> ...
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#if !defined(BOOST_NO_INTRINSIC_WCHAR_T) && (!defined(BOOST_NO_CWCHAR) || defined(sun) || defined(__sun) || defined(__QNX__))
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#include <wchar.h>
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#endif
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//
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// We simply cannot include this header on gcc without getting copious warnings of the kind:
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//
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// ../../../boost/integer_traits.hpp:164:66: warning: use of C99 long long integer constant
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//
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// And yet there is no other reasonable implementation, so we declare this a system header
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// to suppress these warnings.
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//
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#if defined(__GNUC__) && (__GNUC__ >= 4)
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#pragma GCC system_header
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#endif
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namespace boost {
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template<class T>
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class integer_traits : public std::numeric_limits<T>
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{
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public:
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BOOST_STATIC_CONSTANT(bool, is_integral = false);
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};
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namespace detail {
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template<class T, T min_val, T max_val>
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class integer_traits_base
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{
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public:
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BOOST_STATIC_CONSTANT(bool, is_integral = true);
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BOOST_STATIC_CONSTANT(T, const_min = min_val);
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BOOST_STATIC_CONSTANT(T, const_max = max_val);
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};
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#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
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// A definition is required even for integral static constants
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template<class T, T min_val, T max_val>
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const bool integer_traits_base<T, min_val, max_val>::is_integral;
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template<class T, T min_val, T max_val>
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const T integer_traits_base<T, min_val, max_val>::const_min;
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template<class T, T min_val, T max_val>
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const T integer_traits_base<T, min_val, max_val>::const_max;
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#endif
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} // namespace detail
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template<>
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class integer_traits<bool>
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: public std::numeric_limits<bool>,
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public detail::integer_traits_base<bool, false, true>
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{ };
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template<>
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class integer_traits<char>
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: public std::numeric_limits<char>,
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public detail::integer_traits_base<char, CHAR_MIN, CHAR_MAX>
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{ };
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template<>
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class integer_traits<signed char>
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: public std::numeric_limits<signed char>,
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public detail::integer_traits_base<signed char, SCHAR_MIN, SCHAR_MAX>
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{ };
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template<>
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class integer_traits<unsigned char>
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: public std::numeric_limits<unsigned char>,
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public detail::integer_traits_base<unsigned char, 0, UCHAR_MAX>
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{ };
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#ifndef BOOST_NO_INTRINSIC_WCHAR_T
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template<>
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class integer_traits<wchar_t>
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: public std::numeric_limits<wchar_t>,
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// Don't trust WCHAR_MIN and WCHAR_MAX with Mac OS X's native
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// library: they are wrong!
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#if defined(WCHAR_MIN) && defined(WCHAR_MAX) && !defined(__APPLE__)
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public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX>
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#elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__))
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// No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned:
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public detail::integer_traits_base<wchar_t, 0, 0xffff>
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#elif (defined(__sgi) && (!defined(__SGI_STL_PORT) || __SGI_STL_PORT < 0x400))\
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|| (defined __APPLE__)\
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|| (defined(__OpenBSD__) && defined(__GNUC__))\
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|| (defined(__NetBSD__) && defined(__GNUC__))\
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|| (defined(__FreeBSD__) && defined(__GNUC__))\
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|| (defined(__DragonFly__) && defined(__GNUC__))\
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|| (defined(__hpux) && defined(__GNUC__) && (__GNUC__ == 3) && !defined(__SGI_STL_PORT))
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// No WCHAR_MIN and WCHAR_MAX, wchar_t has the same range as int.
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// - SGI MIPSpro with native library
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// - gcc 3.x on HP-UX
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// - Mac OS X with native library
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// - gcc on FreeBSD, OpenBSD and NetBSD
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public detail::integer_traits_base<wchar_t, INT_MIN, INT_MAX>
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#else
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#error No WCHAR_MIN and WCHAR_MAX present, please adjust integer_traits<> for your compiler.
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#endif
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{ };
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#endif // BOOST_NO_INTRINSIC_WCHAR_T
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template<>
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class integer_traits<short>
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: public std::numeric_limits<short>,
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public detail::integer_traits_base<short, SHRT_MIN, SHRT_MAX>
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{ };
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template<>
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class integer_traits<unsigned short>
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: public std::numeric_limits<unsigned short>,
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public detail::integer_traits_base<unsigned short, 0, USHRT_MAX>
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{ };
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template<>
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class integer_traits<int>
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: public std::numeric_limits<int>,
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public detail::integer_traits_base<int, INT_MIN, INT_MAX>
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{ };
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template<>
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class integer_traits<unsigned int>
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: public std::numeric_limits<unsigned int>,
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public detail::integer_traits_base<unsigned int, 0, UINT_MAX>
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{ };
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template<>
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class integer_traits<long>
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: public std::numeric_limits<long>,
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public detail::integer_traits_base<long, LONG_MIN, LONG_MAX>
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{ };
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template<>
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class integer_traits<unsigned long>
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: public std::numeric_limits<unsigned long>,
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public detail::integer_traits_base<unsigned long, 0, ULONG_MAX>
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{ };
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#if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T)
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#if defined(ULLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
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template<>
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class integer_traits< ::boost::long_long_type>
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: public std::numeric_limits< ::boost::long_long_type>,
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public detail::integer_traits_base< ::boost::long_long_type, LLONG_MIN, LLONG_MAX>
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{ };
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template<>
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class integer_traits< ::boost::ulong_long_type>
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: public std::numeric_limits< ::boost::ulong_long_type>,
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public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULLONG_MAX>
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{ };
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#elif defined(ULONG_LONG_MAX) && defined(BOOST_HAS_LONG_LONG)
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template<>
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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>{ };
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template<>
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class integer_traits< ::boost::ulong_long_type>
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: public std::numeric_limits< ::boost::ulong_long_type>,
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public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONG_LONG_MAX>
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{ };
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#elif defined(ULONGLONG_MAX) && defined(BOOST_HAS_LONG_LONG)
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template<>
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class integer_traits< ::boost::long_long_type>
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: public std::numeric_limits< ::boost::long_long_type>,
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public detail::integer_traits_base< ::boost::long_long_type, LONGLONG_MIN, LONGLONG_MAX>
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{ };
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template<>
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class integer_traits< ::boost::ulong_long_type>
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: public std::numeric_limits< ::boost::ulong_long_type>,
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public detail::integer_traits_base< ::boost::ulong_long_type, 0, ULONGLONG_MAX>
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{ };
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#elif defined(_LLONG_MAX) && defined(_C2) && defined(BOOST_HAS_LONG_LONG)
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template<>
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class integer_traits< ::boost::long_long_type>
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: public std::numeric_limits< ::boost::long_long_type>,
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public detail::integer_traits_base< ::boost::long_long_type, -_LLONG_MAX - _C2, _LLONG_MAX>
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{ };
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template<>
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class integer_traits< ::boost::ulong_long_type>
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: public std::numeric_limits< ::boost::ulong_long_type>,
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public detail::integer_traits_base< ::boost::ulong_long_type, 0, _ULLONG_MAX>
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{ };
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#elif defined(BOOST_HAS_LONG_LONG)
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//
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// we have long long but no constants, this happens for example with gcc in -ansi mode,
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// we'll just have to work out the values for ourselves (assumes 2's compliment representation):
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//
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template<>
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class integer_traits< ::boost::long_long_type>
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: public std::numeric_limits< ::boost::long_long_type>,
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public detail::integer_traits_base< ::boost::long_long_type, (1LL << (sizeof(::boost::long_long_type) * CHAR_BIT - 1)), ~(1LL << (sizeof(::boost::long_long_type) * CHAR_BIT - 1))>
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{ };
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template<>
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class integer_traits< ::boost::ulong_long_type>
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: public std::numeric_limits< ::boost::ulong_long_type>,
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public detail::integer_traits_base< ::boost::ulong_long_type, 0, ~0uLL>
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{ };
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#elif defined(BOOST_HAS_MS_INT64)
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template<>
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class integer_traits< __int64>
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: public std::numeric_limits< __int64>,
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public detail::integer_traits_base< __int64, _I64_MIN, _I64_MAX>
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{ };
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template<>
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class integer_traits< unsigned __int64>
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: public std::numeric_limits< unsigned __int64>,
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public detail::integer_traits_base< unsigned __int64, 0, _UI64_MAX>
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{ };
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#endif
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#endif
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} // namespace boost
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#endif /* BOOST_INTEGER_TRAITS_HPP */
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