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