//  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