text: //  boost integer.hpp header file  -------------------------------------------//
  
  //  Copyright Beman Dawes and Daryle Walker 1999.  Distributed under the Boost
  //  Software License, Version 1.0. (See accompanying file
  //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  
  //  See http://www.boost.org/libs/integer for documentation.
  
  //  Revision History
  //   22 Sep 01  Added value-based integer templates. (Daryle Walker)
  //   01 Apr 01  Modified to use new <boost/limits.hpp> header. (John Maddock)
  //   30 Jul 00  Add typename syntax fix (Jens Maurer)
  //   28 Aug 99  Initial version
  
  #ifndef BOOST_INTEGER_HPP
  #define BOOST_INTEGER_HPP
  
  #include <boost/integer_fwd.hpp>  // self include
  
  #include <boost/integer_traits.hpp>  // for boost::::boost::integer_traits
  #include <boost/limits.hpp>          // for ::std::numeric_limits
  #include <boost/cstdint.hpp>         // for boost::int64_t and BOOST_NO_INTEGRAL_INT64_T
  #include <boost/static_assert.hpp>
  
  //
  // We simply cannot include this header on gcc without getting copious warnings of the kind:
  //
  // boost/integer.hpp:77:30: warning: use of C99 long long integer constant
  //
  // And yet there is no other reasonable implementation, so we declare this a system header
  // to suppress these warnings.
  //
  #if defined(__GNUC__) && (__GNUC__ >= 4)
  #pragma GCC system_header
  #endif
  
  namespace boost
  {
  
    //  Helper templates  ------------------------------------------------------//
  
    //  fast integers from least integers
    //  int_fast_t<> works correctly for unsigned too, in spite of the name.
    template< typename LeastInt >
    struct int_fast_t
    {
       typedef LeastInt fast;
       typedef fast     type;
    }; // imps may specialize
  
    namespace detail{
  
    //  convert category to type
    template< int Category > struct int_least_helper {}; // default is empty
    template< int Category > struct uint_least_helper {}; // default is empty
  
    //  specializatons: 1=long, 2=int, 3=short, 4=signed char,
    //     6=unsigned long, 7=unsigned int, 8=unsigned short, 9=unsigned char
    //  no specializations for 0 and 5: requests for a type > long are in error
  #ifdef BOOST_HAS_LONG_LONG
    template<> struct int_least_helper<1> { typedef boost::long_long_type least; };
  #elif defined(BOOST_HAS_MS_INT64)
    template<> struct int_least_helper<1> { typedef __int64 least; };
  #endif
    template<> struct int_least_helper<2> { typedef long least; };
    template<> struct int_least_helper<3> { typedef int least; };
    template<> struct int_least_helper<4> { typedef short least; };
    template<> struct int_least_helper<5> { typedef signed char least; };
  #ifdef BOOST_HAS_LONG_LONG
    template<> struct uint_least_helper<1> { typedef boost::ulong_long_type least; };
  #elif defined(BOOST_HAS_MS_INT64)
    template<> struct uint_least_helper<1> { typedef unsigned __int64 least; };
  #endif
    template<> struct uint_least_helper<2> { typedef unsigned long least; };
    template<> struct uint_least_helper<3> { typedef unsigned int least; };
    template<> struct uint_least_helper<4> { typedef unsigned short least; };
    template<> struct uint_least_helper<5> { typedef unsigned char least; };
  
    template <int Bits>
    struct exact_signed_base_helper{};
    template <int Bits>
    struct exact_unsigned_base_helper{};
  
    template <> struct exact_signed_base_helper<sizeof(signed char)* CHAR_BIT> { typedef signed char exact; };
    template <> struct exact_unsigned_base_helper<sizeof(unsigned char)* CHAR_BIT> { typedef unsigned char exact; };
  #if USHRT_MAX != UCHAR_MAX
    template <> struct exact_signed_base_helper<sizeof(short)* CHAR_BIT> { typedef short exact; };
    template <> struct exact_unsigned_base_helper<sizeof(unsigned short)* CHAR_BIT> { typedef unsigned short exact; };
  #endif
  #if UINT_MAX != USHRT_MAX
    template <> struct exact_signed_base_helper<sizeof(int)* CHAR_BIT> { typedef int exact; };
    template <> struct exact_unsigned_base_helper<sizeof(unsigned int)* CHAR_BIT> { typedef unsigned int exact; };
  #endif
  #if ULONG_MAX != UINT_MAX && ( !defined __TI_COMPILER_VERSION__ || \
      ( __TI_COMPILER_VERSION__ >= 7000000 && !defined __TI_40BIT_LONG__ ) )
    template <> struct exact_signed_base_helper<sizeof(long)* CHAR_BIT> { typedef long exact; };
    template <> struct exact_unsigned_base_helper<sizeof(unsigned long)* CHAR_BIT> { typedef unsigned long exact; };
  #endif
  #if defined(BOOST_HAS_LONG_LONG) &&\
     ((defined(ULLONG_MAX) && (ULLONG_MAX != ULONG_MAX)) ||\
      (defined(ULONG_LONG_MAX) && (ULONG_LONG_MAX != ULONG_MAX)) ||\
      (defined(ULONGLONG_MAX) && (ULONGLONG_MAX != ULONG_MAX)) ||\
      (defined(_ULLONG_MAX) && (_ULLONG_MAX != ULONG_MAX)))
    template <> struct exact_signed_base_helper<sizeof(boost::long_long_type)* CHAR_BIT> { typedef boost::long_long_type exact; };
    template <> struct exact_unsigned_base_helper<sizeof(boost::ulong_long_type)* CHAR_BIT> { typedef boost::ulong_long_type exact; };
  #endif
  
  
    } // namespace detail
  
    //  integer templates specifying number of bits  ---------------------------//
  
    //  signed
    template< int Bits >   // bits (including sign) required
    struct int_t : public boost::detail::exact_signed_base_helper<Bits>
    {
        BOOST_STATIC_ASSERT_MSG(Bits <= (int)(sizeof(boost::intmax_t) * CHAR_BIT),
           "No suitable signed integer type with the requested number of bits is available.");
        typedef typename boost::detail::int_least_helper
          <
  #ifdef BOOST_HAS_LONG_LONG
            (Bits <= (int)(sizeof(boost::long_long_type) * CHAR_BIT)) +
  #else
             1 +
  #endif
            (Bits-1 <= ::std::numeric_limits<long>::digits) +
            (Bits-1 <= ::std::numeric_limits<int>::digits) +
            (Bits-1 <= ::std::numeric_limits<short>::digits) +
            (Bits-1 <= ::std::numeric_limits<signed char>::digits)
          >::least  least;
        typedef typename int_fast_t<least>::type  fast;
    };
  
    //  unsigned
    template< int Bits >   // bits required
    struct uint_t : public boost::detail::exact_unsigned_base_helper<Bits>
    {
       BOOST_STATIC_ASSERT_MSG(Bits <= (int)(sizeof(boost::uintmax_t) * CHAR_BIT),
           "No suitable unsigned integer type with the requested number of bits is available.");
  #if (defined(__BORLANDC__) || defined(__CODEGEAR__)) && defined(BOOST_NO_INTEGRAL_INT64_T)
       // It's really not clear why this workaround should be needed... shrug I guess!  JM
       BOOST_STATIC_CONSTANT(int, s =
             6 +
            (Bits <= ::std::numeric_limits<unsigned long>::digits) +
            (Bits <= ::std::numeric_limits<unsigned int>::digits) +
            (Bits <= ::std::numeric_limits<unsigned short>::digits) +
            (Bits <= ::std::numeric_limits<unsigned char>::digits));
       typedef typename detail::int_least_helper< ::boost::uint_t<Bits>::s>::least least;
  #else
        typedef typename boost::detail::uint_least_helper
          <
  #ifdef BOOST_HAS_LONG_LONG
            (Bits <= (int)(sizeof(boost::long_long_type) * CHAR_BIT)) +
  #else
             1 +
  #endif
            (Bits <= ::std::numeric_limits<unsigned long>::digits) +
            (Bits <= ::std::numeric_limits<unsigned int>::digits) +
            (Bits <= ::std::numeric_limits<unsigned short>::digits) +
            (Bits <= ::std::numeric_limits<unsigned char>::digits)
          >::least  least;
  #endif
        typedef typename int_fast_t<least>::type  fast;
        // int_fast_t<> works correctly for unsigned too, in spite of the name.
    };
  
    //  integer templates specifying extreme value  ----------------------------//
  
    //  signed
  #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T) && defined(BOOST_HAS_LONG_LONG)
    template< boost::long_long_type MaxValue >   // maximum value to require support
  #else
    template< long MaxValue >   // maximum value to require support
  #endif
    struct int_max_value_t
    {
        typedef typename boost::detail::int_least_helper
          <
  #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T) && defined(BOOST_HAS_LONG_LONG)
            (MaxValue <= ::boost::integer_traits<boost::long_long_type>::const_max) +
  #else
             1 +
  #endif
            (MaxValue <= ::boost::integer_traits<long>::const_max) +
            (MaxValue <= ::boost::integer_traits<int>::const_max) +
            (MaxValue <= ::boost::integer_traits<short>::const_max) +
            (MaxValue <= ::boost::integer_traits<signed char>::const_max)
          >::least  least;
        typedef typename int_fast_t<least>::type  fast;
    };
  
  #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T) && defined(BOOST_HAS_LONG_LONG)
    template< boost::long_long_type MinValue >   // minimum value to require support
  #else
    template< long MinValue >   // minimum value to require support
  #endif
    struct int_min_value_t
    {
        typedef typename boost::detail::int_least_helper
          <
  #if !defined(BOOST_NO_INTEGRAL_INT64_T) && !defined(BOOST_NO_INT64_T) && defined(BOOST_HAS_LONG_LONG)
            (MinValue >= ::boost::integer_traits<boost::long_long_type>::const_min) +
  #else
             1 +
  #endif
            (MinValue >= ::boost::integer_traits<long>::const_min) +
            (MinValue >= ::boost::integer_traits<int>::const_min) +
            (MinValue >= ::boost::integer_traits<short>::const_min) +
            (MinValue >= ::boost::integer_traits<signed char>::const_min)
          >::least  least;
        typedef typename int_fast_t<least>::type  fast;
    };
  
    //  unsigned
  #if !defined(BOOST_NO_INTEGRAL_INT64_T) && defined(BOOST_HAS_LONG_LONG)
    template< boost::ulong_long_type MaxValue >   // minimum value to require support
  #else
    template< unsigned long MaxValue >   // minimum value to require support
  #endif
    struct uint_value_t
    {
  #if (defined(__BORLANDC__) || defined(__CODEGEAR__))
       // It's really not clear why this workaround should be needed... shrug I guess!  JM
  #if defined(BOOST_NO_INTEGRAL_INT64_T)
        BOOST_STATIC_CONSTANT(unsigned, which =
             1 +
            (MaxValue <= ::boost::integer_traits<unsigned long>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned int>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned short>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned char>::const_max));
        typedef typename detail::int_least_helper< ::boost::uint_value_t<MaxValue>::which>::least least;
  #else // BOOST_NO_INTEGRAL_INT64_T
        BOOST_STATIC_CONSTANT(unsigned, which =
             1 +
            (MaxValue <= ::boost::integer_traits<boost::ulong_long_type>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned long>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned int>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned short>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned char>::const_max));
        typedef typename detail::uint_least_helper< ::boost::uint_value_t<MaxValue>::which>::least least;
  #endif // BOOST_NO_INTEGRAL_INT64_T
  #else
        typedef typename boost::detail::uint_least_helper
          <
  #if !defined(BOOST_NO_INTEGRAL_INT64_T) && defined(BOOST_HAS_LONG_LONG)
            (MaxValue <= ::boost::integer_traits<boost::ulong_long_type>::const_max) +
  #else
             1 +
  #endif
            (MaxValue <= ::boost::integer_traits<unsigned long>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned int>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned short>::const_max) +
            (MaxValue <= ::boost::integer_traits<unsigned char>::const_max)
          >::least  least;
  #endif
        typedef typename int_fast_t<least>::type  fast;
    };
  
  
  } // namespace boost
  
  #endif  // BOOST_INTEGER_HPP
  