262 lines
11 KiB
C++
262 lines
11 KiB
C++
// 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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#include <boost/static_assert.hpp>
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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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template< int Category > struct uint_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 uint_least_helper<1> { typedef boost::ulong_long_type least; };
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#elif defined(BOOST_HAS_MS_INT64)
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template<> struct uint_least_helper<1> { typedef unsigned __int64 least; };
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#endif
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template<> struct uint_least_helper<2> { typedef unsigned long least; };
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template<> struct uint_least_helper<3> { typedef unsigned int least; };
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template<> struct uint_least_helper<4> { typedef unsigned short least; };
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template<> struct uint_least_helper<5> { 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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BOOST_STATIC_ASSERT_MSG(Bits <= (int)(sizeof(boost::intmax_t) * CHAR_BIT),
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"No suitable signed integer type with the requested number of bits is available.");
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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 <= (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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BOOST_STATIC_ASSERT_MSG(Bits <= (int)(sizeof(boost::uintmax_t) * CHAR_BIT),
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"No suitable unsigned integer type with the requested number of bits is available.");
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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::uint_least_helper
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<
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#ifdef BOOST_HAS_LONG_LONG
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(Bits <= (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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1 +
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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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1 +
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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::uint_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::uint_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::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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