author | Pat Downey <patd@symbian.org> |
Tue, 13 Jul 2010 17:51:34 +0100 | |
branch | RCL_3 |
changeset 43 | 97e3c206731f |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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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 |