// Boost integer/integer_mask.hpp header file ------------------------------// | |
// (C) Copyright Daryle Walker 2001. | |
// 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 for updates, documentation, and revision history. | |
#ifndef BOOST_INTEGER_INTEGER_MASK_HPP | |
#define BOOST_INTEGER_INTEGER_MASK_HPP | |
#include <boost/integer_fwd.hpp> // self include | |
#include <boost/config.hpp> // for BOOST_STATIC_CONSTANT | |
#include <boost/integer.hpp> // for boost::uint_t | |
#include <climits> // for UCHAR_MAX, etc. | |
#include <cstddef> // for std::size_t | |
#include <boost/limits.hpp> // for std::numeric_limits | |
// | |
// We simply cannot include this header on gcc without getting copious warnings of the kind: | |
// | |
// boost/integer/integer_mask.hpp:93:35: 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 | |
{ | |
// Specified single-bit mask class declaration -----------------------------// | |
// (Lowest bit starts counting at 0.) | |
template < std::size_t Bit > | |
struct high_bit_mask_t | |
{ | |
typedef typename uint_t<(Bit + 1)>::least least; | |
typedef typename uint_t<(Bit + 1)>::fast fast; | |
BOOST_STATIC_CONSTANT( least, high_bit = (least( 1u ) << Bit) ); | |
BOOST_STATIC_CONSTANT( fast, high_bit_fast = (fast( 1u ) << Bit) ); | |
BOOST_STATIC_CONSTANT( std::size_t, bit_position = Bit ); | |
}; // boost::high_bit_mask_t | |
// Specified bit-block mask class declaration ------------------------------// | |
// Makes masks for the lowest N bits | |
// (Specializations are needed when N fills up a type.) | |
template < std::size_t Bits > | |
struct low_bits_mask_t | |
{ | |
typedef typename uint_t<Bits>::least least; | |
typedef typename uint_t<Bits>::fast fast; | |
BOOST_STATIC_CONSTANT( least, sig_bits = (~( ~(least( 0u )) << Bits )) ); | |
BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) ); | |
BOOST_STATIC_CONSTANT( std::size_t, bit_count = Bits ); | |
}; // boost::low_bits_mask_t | |
#define BOOST_LOW_BITS_MASK_SPECIALIZE( Type ) \ | |
template < > struct low_bits_mask_t< std::numeric_limits<Type>::digits > { \ | |
typedef std::numeric_limits<Type> limits_type; \ | |
typedef uint_t<limits_type::digits>::least least; \ | |
typedef uint_t<limits_type::digits>::fast fast; \ | |
BOOST_STATIC_CONSTANT( least, sig_bits = (~( least(0u) )) ); \ | |
BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) ); \ | |
BOOST_STATIC_CONSTANT( std::size_t, bit_count = limits_type::digits ); \ | |
} | |
#ifdef BOOST_MSVC | |
#pragma warning(push) | |
#pragma warning(disable:4245) // 'initializing' : conversion from 'int' to 'const boost::low_bits_mask_t<8>::least', signed/unsigned mismatch | |
#endif | |
BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned char ); | |
#if USHRT_MAX > UCHAR_MAX | |
BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned short ); | |
#endif | |
#if UINT_MAX > USHRT_MAX | |
BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned int ); | |
#endif | |
#if ULONG_MAX > UINT_MAX | |
BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned long ); | |
#endif | |
#if defined(BOOST_HAS_LONG_LONG) | |
#if ((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))) | |
BOOST_LOW_BITS_MASK_SPECIALIZE( boost::ulong_long_type ); | |
#endif | |
#elif defined(BOOST_HAS_MS_INT64) | |
#if 18446744073709551615ui64 > ULONG_MAX | |
BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned __int64 ); | |
#endif | |
#endif | |
#ifdef BOOST_MSVC | |
#pragma warning(pop) | |
#endif | |
#undef BOOST_LOW_BITS_MASK_SPECIALIZE | |
} // namespace boost | |
#endif // BOOST_INTEGER_INTEGER_MASK_HPP |