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69 lines
2.5 KiB
69 lines
2.5 KiB
///////////////////////////////////////////////////////////////////////////// |
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// |
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// (C) Copyright Ion Gaztanaga 2007-2009 |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See 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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// |
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// See http://www.boost.org/libs/intrusive for documentation. |
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// |
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///////////////////////////////////////////////////////////////////////////// |
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#ifndef BOOST_INTRUSIVE_DETAIL_PARENT_FROM_MEMBER_HPP |
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#define BOOST_INTRUSIVE_DETAIL_PARENT_FROM_MEMBER_HPP |
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#include <boost/intrusive/detail/config_begin.hpp> |
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#include <cstddef> |
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#if defined(BOOST_MSVC) || ((defined(_WIN32) || defined(__WIN32__) || defined(WIN32)) && defined(BOOST_INTEL)) |
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#define BOOST_INTRUSIVE_MSVC_COMPLIANT_PTR_TO_MEMBER |
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#include <boost/cstdint.hpp> |
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#endif |
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namespace boost { |
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namespace intrusive { |
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namespace detail { |
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template<class Parent, class Member> |
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inline std::ptrdiff_t offset_from_pointer_to_member(const Member Parent::* ptr_to_member) |
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{ |
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//The implementation of a pointer to member is compiler dependent. |
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#if defined(BOOST_INTRUSIVE_MSVC_COMPLIANT_PTR_TO_MEMBER) |
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//msvc compliant compilers use their the first 32 bits as offset (even in 64 bit mode) |
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return *(const boost::int32_t*)(void*)&ptr_to_member; |
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//This works with gcc, msvc, ac++, ibmcpp |
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#elif defined(__GNUC__) || defined(__HP_aCC) || defined(BOOST_INTEL) || \ |
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defined(__IBMCPP__) || defined(__DECCXX) |
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const Parent * const parent = 0; |
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const char *const member = reinterpret_cast<const char*>(&(parent->*ptr_to_member)); |
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return std::ptrdiff_t(member - reinterpret_cast<const char*>(parent)); |
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#else |
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//This is the traditional C-front approach: __MWERKS__, __DMC__, __SUNPRO_CC |
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return (*(const std::ptrdiff_t*)(void*)&ptr_to_member) - 1; |
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#endif |
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} |
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template<class Parent, class Member> |
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inline Parent *parent_from_member(Member *member, const Member Parent::* ptr_to_member) |
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{ |
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return (Parent*)((char*)member - offset_from_pointer_to_member(ptr_to_member)); |
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} |
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template<class Parent, class Member> |
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inline const Parent *parent_from_member(const Member *member, const Member Parent::* ptr_to_member) |
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{ |
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return (const Parent*)((const char*)member - offset_from_pointer_to_member(ptr_to_member)); |
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} |
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} //namespace detail { |
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} //namespace intrusive { |
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} //namespace boost { |
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#ifdef BOOST_INTRUSIVE_MSVC_COMPLIANT_PTR_TO_MEMBER |
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#undef BOOST_INTRUSIVE_MSVC_COMPLIANT_PTR_TO_MEMBER |
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#endif |
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#include <boost/intrusive/detail/config_end.hpp> |
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#endif //#ifndef BOOST_INTRUSIVE_DETAIL_PARENT_FROM_MEMBER_HPP
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