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pointer_plus_bit.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\intrusive\pointer_plus_bit.hpp
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///////////////////////////////////////////////////////////////////////////// // // (C) Copyright Ion Gaztanaga 2007 // // 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/libs/intrusive for documentation. // ///////////////////////////////////////////////////////////////////////////// #ifndef BOOST_INTRUSIVE_POINTER_PLUS_BIT_HPP #define BOOST_INTRUSIVE_POINTER_PLUS_BIT_HPP namespace boost { namespace intrusive { //!This trait class is used to know if a pointer //!can embed an extra bit of information if //!it's going to be used to point to objects //!with an alignment of "Alignment" bytes. template
struct has_pointer_plus_bit { static const bool value = false; }; //!This is an specialization for raw pointers. //!Raw pointers can embed an extra bit in the lower bit //!if the alignment is multiple of 2. template
struct has_pointer_plus_bit
{ static const bool value = (N % 2u == 0); }; //!This is class that is supposed to have static methods //!to embed an extra bit of information in a pointer. //!This is a declaration and there is no default implementation, //!because operations to embed the bit change with every pointer type. //! //!An implementation that detects that a pointer type whose //!has_pointer_plus_bit<>::value is non-zero can make use of these //!operations to embed the bit in the pointer. template
struct pointer_plus_bit { static const bool value = false; }; //!This is the specialization to embed an extra bit of information //!in a raw pointer. The extra bit is stored in the lower bit of the pointer. template
struct pointer_plus_bit
{ typedef T* pointer; static pointer get_pointer(pointer n) { return pointer(std::size_t(n) & ~std::size_t(1u)); } static void set_pointer(pointer &n, pointer p) { assert(0 == (std::size_t(p) & std::size_t(1u))); n = pointer(std::size_t(p) | (std::size_t(n) & std::size_t(1u))); } static bool get_bit(pointer n) { return (std::size_t(n) & std::size_t(1u)) != 0; } static void set_bit(pointer &n, bool c) { n = pointer(std::size_t(get_pointer(n)) | std::size_t(c)); } }; } //namespace intrusive } //namespace boost #endif //BOOST_INTRUSIVE_POINTER_PLUS_BIT_HPP
pointer_plus_bit.hpp
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