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257 lines
11 KiB
257 lines
11 KiB
// boost integer.hpp header file -------------------------------------------// |
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// Copyright Beman Dawes and Daryle Walker 1999. Distributed under the Boost |
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// Software License, Version 1.0. (See accompanying file |
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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// See http://www.boost.org/libs/integer for documentation. |
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// Revision History |
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// 22 Sep 01 Added value-based integer templates. (Daryle Walker) |
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// 01 Apr 01 Modified to use new <boost/limits.hpp> header. (John Maddock) |
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// 30 Jul 00 Add typename syntax fix (Jens Maurer) |
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// 28 Aug 99 Initial version |
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#ifndef BOOST_INTEGER_HPP |
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#define BOOST_INTEGER_HPP |
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#include <boost/integer_fwd.hpp> // self include |
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#include <boost/integer_traits.hpp> // for boost::::boost::integer_traits |
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#include <boost/limits.hpp> // for ::std::numeric_limits |
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#include <boost/cstdint.hpp> // for boost::int64_t and BOOST_NO_INTEGRAL_INT64_T |
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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.hpp:77:30: 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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{ |
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// Helper templates ------------------------------------------------------// |
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// fast integers from least integers |
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// int_fast_t<> works correctly for unsigned too, in spite of the name. |
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template< typename LeastInt > |
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struct int_fast_t |
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{ |
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typedef LeastInt fast; |
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typedef fast type; |
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}; // imps may specialize |
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namespace detail{ |
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// convert category to type |
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template< int Category > struct int_least_helper {}; // default is empty |
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// specializatons: 1=long, 2=int, 3=short, 4=signed char, |
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// 6=unsigned long, 7=unsigned int, 8=unsigned short, 9=unsigned char |
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// no specializations for 0 and 5: requests for a type > long are in error |
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#ifdef BOOST_HAS_LONG_LONG |
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template<> struct int_least_helper<1> { typedef boost::long_long_type least; }; |
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#elif defined(BOOST_HAS_MS_INT64) |
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template<> struct int_least_helper<1> { typedef __int64 least; }; |
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#endif |
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template<> struct int_least_helper<2> { typedef long least; }; |
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template<> struct int_least_helper<3> { typedef int least; }; |
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template<> struct int_least_helper<4> { typedef short least; }; |
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template<> struct int_least_helper<5> { typedef signed char least; }; |
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#ifdef BOOST_HAS_LONG_LONG |
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template<> struct int_least_helper<6> { typedef boost::ulong_long_type least; }; |
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#elif defined(BOOST_HAS_MS_INT64) |
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template<> struct int_least_helper<6> { typedef unsigned __int64 least; }; |
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#endif |
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template<> struct int_least_helper<7> { typedef unsigned long least; }; |
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template<> struct int_least_helper<8> { typedef unsigned int least; }; |
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template<> struct int_least_helper<9> { typedef unsigned short least; }; |
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template<> struct int_least_helper<10> { typedef unsigned char least; }; |
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template <int Bits> |
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struct exact_signed_base_helper{}; |
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template <int Bits> |
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struct exact_unsigned_base_helper{}; |
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template <> struct exact_signed_base_helper<sizeof(signed char)* CHAR_BIT> { typedef signed char exact; }; |
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template <> struct exact_unsigned_base_helper<sizeof(unsigned char)* CHAR_BIT> { typedef unsigned char exact; }; |
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#if USHRT_MAX != UCHAR_MAX |
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template <> struct exact_signed_base_helper<sizeof(short)* CHAR_BIT> { typedef short exact; }; |
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template <> struct exact_unsigned_base_helper<sizeof(unsigned short)* CHAR_BIT> { typedef unsigned short exact; }; |
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#endif |
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#if UINT_MAX != USHRT_MAX |
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template <> struct exact_signed_base_helper<sizeof(int)* CHAR_BIT> { typedef int exact; }; |
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template <> struct exact_unsigned_base_helper<sizeof(unsigned int)* CHAR_BIT> { typedef unsigned int exact; }; |
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#endif |
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#if ULONG_MAX != UINT_MAX |
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template <> struct exact_signed_base_helper<sizeof(long)* CHAR_BIT> { typedef long exact; }; |
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template <> struct exact_unsigned_base_helper<sizeof(unsigned long)* CHAR_BIT> { typedef unsigned long exact; }; |
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#endif |
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#if defined(BOOST_HAS_LONG_LONG) &&\ |
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((defined(ULLONG_MAX) && (ULLONG_MAX != ULONG_MAX)) ||\ |
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(defined(ULONG_LONG_MAX) && (ULONG_LONG_MAX != ULONG_MAX)) ||\ |
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(defined(ULONGLONG_MAX) && (ULONGLONG_MAX != ULONG_MAX)) ||\ |
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(defined(_ULLONG_MAX) && (_ULLONG_MAX != ULONG_MAX))) |
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template <> struct exact_signed_base_helper<sizeof(boost::long_long_type)* CHAR_BIT> { typedef boost::long_long_type exact; }; |
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template <> struct exact_unsigned_base_helper<sizeof(boost::ulong_long_type)* CHAR_BIT> { typedef boost::ulong_long_type exact; }; |
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#endif |
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} // namespace detail |
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// integer templates specifying number of bits ---------------------------// |
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// signed |
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template< int Bits > // bits (including sign) required |
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struct int_t : public detail::exact_signed_base_helper<Bits> |
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{ |
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typedef typename detail::int_least_helper |
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< |
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#ifdef BOOST_HAS_LONG_LONG |
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(Bits-1 <= (int)(sizeof(boost::long_long_type) * CHAR_BIT)) + |
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#else |
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1 + |
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#endif |
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(Bits-1 <= ::std::numeric_limits<long>::digits) + |
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(Bits-1 <= ::std::numeric_limits<int>::digits) + |
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(Bits-1 <= ::std::numeric_limits<short>::digits) + |
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(Bits-1 <= ::std::numeric_limits<signed char>::digits) |
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>::least least; |
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typedef typename int_fast_t<least>::type fast; |
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}; |
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// unsigned |
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template< int Bits > // bits required |
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struct uint_t : public detail::exact_unsigned_base_helper<Bits> |
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{ |
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#if (defined(__BORLANDC__) || defined(__CODEGEAR__)) && defined(BOOST_NO_INTEGRAL_INT64_T) |
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// It's really not clear why this workaround should be needed... shrug I guess! JM |
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BOOST_STATIC_CONSTANT(int, s = |
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6 + |
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(Bits <= ::std::numeric_limits<unsigned long>::digits) + |
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(Bits <= ::std::numeric_limits<unsigned int>::digits) + |
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(Bits <= ::std::numeric_limits<unsigned short>::digits) + |
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(Bits <= ::std::numeric_limits<unsigned char>::digits)); |
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typedef typename detail::int_least_helper< ::boost::uint_t<Bits>::s>::least least; |
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#else |
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typedef typename detail::int_least_helper |
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< |
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5 + |
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#ifdef BOOST_HAS_LONG_LONG |
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(Bits-1 <= (int)(sizeof(boost::long_long_type) * CHAR_BIT)) + |
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#else |
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1 + |
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#endif |
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(Bits <= ::std::numeric_limits<unsigned long>::digits) + |
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(Bits <= ::std::numeric_limits<unsigned int>::digits) + |
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(Bits <= ::std::numeric_limits<unsigned short>::digits) + |
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(Bits <= ::std::numeric_limits<unsigned char>::digits) |
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>::least least; |
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#endif |
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typedef typename int_fast_t<least>::type fast; |
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// int_fast_t<> works correctly for unsigned too, in spite of the name. |
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}; |
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// integer templates specifying extreme value ----------------------------// |
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// signed |
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#if !defined(BOOST_NO_INTEGRAL_INT64_T) && defined(BOOST_HAS_LONG_LONG) |
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template< boost::long_long_type MaxValue > // maximum value to require support |
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#else |
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template< long MaxValue > // maximum value to require support |
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#endif |
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struct int_max_value_t |
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{ |
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typedef typename detail::int_least_helper |
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< |
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#if !defined(BOOST_NO_INTEGRAL_INT64_T) && defined(BOOST_HAS_LONG_LONG) |
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(MaxValue <= ::boost::integer_traits<boost::long_long_type>::const_max) + |
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#else |
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1 + |
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#endif |
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(MaxValue <= ::boost::integer_traits<long>::const_max) + |
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(MaxValue <= ::boost::integer_traits<int>::const_max) + |
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(MaxValue <= ::boost::integer_traits<short>::const_max) + |
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(MaxValue <= ::boost::integer_traits<signed char>::const_max) |
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>::least least; |
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typedef typename int_fast_t<least>::type fast; |
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}; |
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#if !defined(BOOST_NO_INTEGRAL_INT64_T) && defined(BOOST_HAS_LONG_LONG) |
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template< boost::long_long_type MinValue > // minimum value to require support |
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#else |
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template< long MinValue > // minimum value to require support |
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#endif |
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struct int_min_value_t |
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{ |
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typedef typename detail::int_least_helper |
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< |
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#if !defined(BOOST_NO_INTEGRAL_INT64_T) && defined(BOOST_HAS_LONG_LONG) |
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(MinValue >= ::boost::integer_traits<boost::long_long_type>::const_min) + |
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#else |
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1 + |
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#endif |
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(MinValue >= ::boost::integer_traits<long>::const_min) + |
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(MinValue >= ::boost::integer_traits<int>::const_min) + |
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(MinValue >= ::boost::integer_traits<short>::const_min) + |
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(MinValue >= ::boost::integer_traits<signed char>::const_min) |
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>::least least; |
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typedef typename int_fast_t<least>::type fast; |
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}; |
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// unsigned |
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#if !defined(BOOST_NO_INTEGRAL_INT64_T) && defined(BOOST_HAS_LONG_LONG) |
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template< boost::ulong_long_type MaxValue > // minimum value to require support |
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#else |
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template< unsigned long MaxValue > // minimum value to require support |
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#endif |
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struct uint_value_t |
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{ |
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#if (defined(__BORLANDC__) || defined(__CODEGEAR__)) |
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// It's really not clear why this workaround should be needed... shrug I guess! JM |
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#if defined(BOOST_NO_INTEGRAL_INT64_T) |
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BOOST_STATIC_CONSTANT(unsigned, which = |
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6 + |
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(MaxValue <= ::boost::integer_traits<unsigned long>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned int>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned short>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned char>::const_max)); |
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typedef typename detail::int_least_helper< ::boost::uint_value_t<MaxValue>::which>::least least; |
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#else // BOOST_NO_INTEGRAL_INT64_T |
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BOOST_STATIC_CONSTANT(unsigned, which = |
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5 + |
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(MaxValue <= ::boost::integer_traits<boost::ulong_long_type>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned long>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned int>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned short>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned char>::const_max)); |
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typedef typename detail::int_least_helper< ::boost::uint_value_t<MaxValue>::which>::least least; |
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#endif // BOOST_NO_INTEGRAL_INT64_T |
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#else |
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typedef typename detail::int_least_helper |
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< |
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5 + |
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#if !defined(BOOST_NO_INTEGRAL_INT64_T) && defined(BOOST_HAS_LONG_LONG) |
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(MaxValue <= ::boost::integer_traits<boost::ulong_long_type>::const_max) + |
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#else |
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1 + |
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#endif |
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(MaxValue <= ::boost::integer_traits<unsigned long>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned int>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned short>::const_max) + |
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(MaxValue <= ::boost::integer_traits<unsigned char>::const_max) |
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>::least least; |
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#endif |
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typedef typename int_fast_t<least>::type fast; |
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}; |
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} // namespace boost |
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#endif // BOOST_INTEGER_HPP
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