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// Boost integer/integer_mask.hpp header file ------------------------------//
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// (C) Copyright Daryle Walker 2001.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org for updates, documentation, and revision history.
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#ifndef BOOST_INTEGER_INTEGER_MASK_HPP
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#define BOOST_INTEGER_INTEGER_MASK_HPP
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#include <boost/integer_fwd.hpp> // self include
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#include <boost/config.hpp> // for BOOST_STATIC_CONSTANT
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#include <boost/integer.hpp> // for boost::uint_t
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#include <climits> // for UCHAR_MAX, etc.
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#include <cstddef> // for std::size_t
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#include <boost/limits.hpp> // for std::numeric_limits
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namespace boost
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{
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// Specified single-bit mask class declaration -----------------------------//
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// (Lowest bit starts counting at 0.)
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template < std::size_t Bit >
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struct high_bit_mask_t
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{
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typedef typename uint_t<(Bit + 1)>::least least;
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typedef typename uint_t<(Bit + 1)>::fast fast;
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BOOST_STATIC_CONSTANT( least, high_bit = (least( 1u ) << Bit) );
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BOOST_STATIC_CONSTANT( fast, high_bit_fast = (fast( 1u ) << Bit) );
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BOOST_STATIC_CONSTANT( std::size_t, bit_position = Bit );
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}; // boost::high_bit_mask_t
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// Specified bit-block mask class declaration ------------------------------//
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// Makes masks for the lowest N bits
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// (Specializations are needed when N fills up a type.)
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template < std::size_t Bits >
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struct low_bits_mask_t
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{
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typedef typename uint_t<Bits>::least least;
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typedef typename uint_t<Bits>::fast fast;
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BOOST_STATIC_CONSTANT( least, sig_bits = (~( ~(least( 0u )) << Bits )) );
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BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) );
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BOOST_STATIC_CONSTANT( std::size_t, bit_count = Bits );
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}; // boost::low_bits_mask_t
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#define BOOST_LOW_BITS_MASK_SPECIALIZE( Type ) \
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template < > struct low_bits_mask_t< std::numeric_limits<Type>::digits > { \
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typedef std::numeric_limits<Type> limits_type; \
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typedef uint_t<limits_type::digits>::least least; \
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typedef uint_t<limits_type::digits>::fast fast; \
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BOOST_STATIC_CONSTANT( least, sig_bits = (~( least(0u) )) ); \
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BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) ); \
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BOOST_STATIC_CONSTANT( std::size_t, bit_count = limits_type::digits ); \
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}
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BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned char );
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#if USHRT_MAX > UCHAR_MAX
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BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned short );
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#endif
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#if UINT_MAX > USHRT_MAX
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BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned int );
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#endif
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#if ULONG_MAX > UINT_MAX
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BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned long );
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#endif
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#undef BOOST_LOW_BITS_MASK_SPECIALIZE
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} // namespace boost
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#endif // BOOST_INTEGER_INTEGER_MASK_HPP
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