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integer_mask.hpp
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// 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.) #ifdef BOOST_MSVC #pragma warning(push) #pragma warning(disable:4310) // cast truncates constant value #endif 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(~(least(~(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 #ifdef BOOST_MSVC #pragma warning(pop) #endif #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