boostorg/integer
1
0
Fork 1
mirror of https://github.com/boostorg/integer.git synced 2025-11-04 10:11:37 +01:00
Code Issues Packages Projects Releases Wiki Activity
Files
614515a77b3952198580d0c350a6a3c0f5655f7b
integer/include/boost/integer.hpp
John Maddock e3da9260e1 Merge fixes from Trunk. 
[SVN r62832]
2010-06-12 08:33:32 +00:00

258 lines
11 KiB
C++
Raw Blame History

// 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
Reference in New Issue View Git Blame Copy Permalink