forked from boostorg/integer
Added daryle's missing files
[SVN r11971]
This commit is contained in:
Dave Abrahams
93
include/boost/integer/integer_mask.hpp
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93
include/boost/integer/integer_mask.hpp
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// Boost integer/integer_mask.hpp header file ------------------------------//
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// (C) Copyright Daryle Walker 2001. Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or
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// implied warranty, and with no claim as to its suitability for any purpose.
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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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91
include/boost/integer/static_log2.hpp
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91
include/boost/integer/static_log2.hpp
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// Boost integer/static_log2.hpp header file -------------------------------//
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// (C) Copyright Daryle Walker 2001. Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or
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// implied warranty, and with no claim as to its suitability for any purpose.
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// See http://www.boost.org for updates, documentation, and revision history.
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#ifndef BOOST_INTEGER_STATIC_LOG2_HPP
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#define BOOST_INTEGER_STATIC_LOG2_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/limits.hpp> // for std::numeric_limits
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namespace boost
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{
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// Implementation details --------------------------------------------------//
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namespace detail
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{
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// Forward declarations
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template < unsigned long Val, int Place = 0, int Index
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= std::numeric_limits<unsigned long>::digits >
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struct static_log2_helper_t;
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template < unsigned long Val, int Place >
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struct static_log2_helper_t< Val, Place, 1 >;
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// Recursively build the logarithm by examining the upper bits
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template < unsigned long Val, int Place, int Index >
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struct static_log2_helper_t
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{
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private:
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BOOST_STATIC_CONSTANT( int, half_place = Index / 2 );
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BOOST_STATIC_CONSTANT( unsigned long, lower_mask = (1ul << half_place)
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- 1ul );
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BOOST_STATIC_CONSTANT( unsigned long, upper_mask = ~lower_mask );
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BOOST_STATIC_CONSTANT( bool, do_shift = (Val & upper_mask) != 0ul );
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BOOST_STATIC_CONSTANT( unsigned long, new_val = do_shift ? (Val
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>> half_place) : Val );
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BOOST_STATIC_CONSTANT( int, new_place = do_shift ? (Place + half_place)
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: Place );
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BOOST_STATIC_CONSTANT( int, new_index = Index - half_place );
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typedef static_log2_helper_t<new_val, new_place, new_index> next_step_type;
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public:
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BOOST_STATIC_CONSTANT( int, value = next_step_type::value );
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}; // boost::detail::static_log2_helper_t
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// Non-recursive case
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template < unsigned long Val, int Place >
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struct static_log2_helper_t< Val, Place, 1 >
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{
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public:
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BOOST_STATIC_CONSTANT( int, value = Place );
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}; // boost::detail::static_log2_helper_t
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} // namespace detail
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// Compile-time log-base-2 evaluator class declaration ---------------------//
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template < unsigned long Value >
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struct static_log2
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{
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BOOST_STATIC_CONSTANT( int, value
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= detail::static_log2_helper_t<Value>::value );
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};
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template < >
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struct static_log2< 0ul >
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{
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// The logarithm of zero is undefined.
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};
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} // namespace boost
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#endif // BOOST_INTEGER_STATIC_LOG2_HPP
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56
include/boost/integer/static_min_max.hpp
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56
include/boost/integer/static_min_max.hpp
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@ -0,0 +1,56 @@
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// Boost integer/static_min_max.hpp header file ----------------------------//
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// (C) Copyright Daryle Walker 2001. Permission to copy, use, modify, sell
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// and distribute this software is granted provided this copyright notice
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// appears in all copies. This software is provided "as is" without
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// express or implied warranty, and with no claim as to its suitability
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// for any purpose.
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// See http://www.boost.org for updates, documentation, and revision history.
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#ifndef BOOST_INTEGER_STATIC_MIN_MAX_HPP
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#define BOOST_INTEGER_STATIC_MIN_MAX_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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namespace boost
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{
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// Compile-time extrema class declarations ---------------------------------//
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// Get the minimum or maximum of two values, signed or unsigned.
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template < long Value1, long Value2 >
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struct static_signed_min
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{
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BOOST_STATIC_CONSTANT( long, value = (Value1 > Value2) ? Value2 : Value1 );
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};
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template < long Value1, long Value2 >
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struct static_signed_max
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{
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BOOST_STATIC_CONSTANT( long, value = (Value1 < Value2) ? Value2 : Value1 );
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};
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template < unsigned long Value1, unsigned long Value2 >
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struct static_unsigned_min
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{
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BOOST_STATIC_CONSTANT( unsigned long, value
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= (Value1 > Value2) ? Value2 : Value1 );
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};
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template < unsigned long Value1, unsigned long Value2 >
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struct static_unsigned_max
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{
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BOOST_STATIC_CONSTANT( unsigned long, value
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= (Value1 < Value2) ? Value2 : Value1 );
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};
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} // namespace boost
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#endif // BOOST_INTEGER_STATIC_MIN_MAX_HPP
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