boost/integer.hpp
// 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 // // 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 // 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 int_least_helper<6> { typedef boost::ulong_long_type least; }; #elif defined(BOOST_HAS_MS_INT64) template<> struct int_least_helper<6> { typedef unsigned __int64 least; }; #endif template<> struct int_least_helper<7> { typedef unsigned long least; }; template<> struct int_least_helper<8> { typedef unsigned int least; }; template<> struct int_least_helper<9> { typedef unsigned short least; }; template<> struct int_least_helper<10> { 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 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 detail::exact_signed_base_helper<Bits> { typedef typename detail::int_least_helper < #ifdef BOOST_HAS_LONG_LONG (Bits-1 <= (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 detail::exact_unsigned_base_helper<Bits> { #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 detail::int_least_helper < 5 + #ifdef BOOST_HAS_LONG_LONG (Bits-1 <= (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_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 detail::int_least_helper < #if !defined(BOOST_NO_INTEGRAL_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_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 detail::int_least_helper < #if !defined(BOOST_NO_INTEGRAL_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 = 6 + (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 = 5 + (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::int_least_helper< ::boost::uint_value_t<MaxValue>::which>::least least; #endif // BOOST_NO_INTEGRAL_INT64_T #else typedef typename detail::int_least_helper < 5 + #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