731 lines
25 KiB
C++
731 lines
25 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_OFFSET_PTR_HPP
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#define BOOST_INTERPROCESS_OFFSET_PTR_HPP
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#if (defined _MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/interprocess/interprocess_fwd.hpp>
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#include <boost/interprocess/detail/utilities.hpp>
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#include <boost/interprocess/detail/cast_tags.hpp>
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#include <boost/interprocess/detail/mpl.hpp>
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#include <boost/assert.hpp>
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#include <ostream>
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#include <istream>
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#include <iterator>
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#include <boost/aligned_storage.hpp>
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#include <boost/type_traits/alignment_of.hpp>
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//!\file
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//!Describes a smart pointer that stores the offset between this pointer and
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//!target pointee, called offset_ptr.
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namespace boost {
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//Predeclarations
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template <class T>
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struct has_trivial_constructor;
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template <class T>
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struct has_trivial_destructor;
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namespace interprocess {
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/// @cond
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namespace ipcdetail {
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template<class OffsetType, std::size_t OffsetAlignment>
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union offset_ptr_internal
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{
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explicit offset_ptr_internal(OffsetType off)
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: m_offset(off)
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{}
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OffsetType m_offset; //Distance between this object and pointee address
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typename ::boost::aligned_storage
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< sizeof(OffsetType)
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, (OffsetAlignment == offset_type_alignment) ?
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::boost::alignment_of<OffsetType>::value : OffsetAlignment
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>::type alignment_helper;
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};
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//Note: using the address of a local variable to point to another address
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//is not standard conforming and this can be optimized-away by the compiler.
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//Non-inlining is a method to remain illegal but correct
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//Undef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_XXX if your compiler can inline
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//this code without breaking the library
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////////////////////////////////////////////////////////////////////////
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//
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// offset_ptr_to_raw_pointer
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//
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////////////////////////////////////////////////////////////////////////
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#define BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_PTR
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#define BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_PTR
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template<int Dummy>
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#ifndef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_PTR
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BOOST_INTERPROCESS_NEVER_INLINE
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#elif defined(NDEBUG)
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inline
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#endif
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void * offset_ptr_to_raw_pointer(const volatile void *this_ptr, std::size_t offset)
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{
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typedef pointer_size_t_caster<void*> caster_t;
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#ifndef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_PTR
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if(offset == 1){
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return 0;
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}
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else{
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caster_t caster((void*)this_ptr);
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return caster_t(caster.size() + offset).pointer();
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}
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#else
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caster_t caster((void*)this_ptr);
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return caster_t((caster.size() + offset) & -std::size_t(offset != 1)).pointer();
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#endif
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}
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#ifdef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_PTR
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#undef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_PTR
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#endif
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#ifdef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_PTR
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#undef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_PTR
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#endif
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////////////////////////////////////////////////////////////////////////
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//
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// offset_ptr_to_offset
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//
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////////////////////////////////////////////////////////////////////////
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#define BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_OFF
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//Branchless seems slower in x86
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//#define BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF
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template<int Dummy>
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#ifndef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_OFF
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BOOST_INTERPROCESS_NEVER_INLINE
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#elif defined(NDEBUG)
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inline
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#endif
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std::size_t offset_ptr_to_offset(const volatile void *ptr, const volatile void *this_ptr)
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{
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typedef pointer_size_t_caster<void*> caster_t;
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#ifndef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF
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//offset == 1 && ptr != 0 is not legal for this pointer
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if(!ptr){
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return 1;
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}
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else{
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caster_t this_caster((void*)this_ptr);
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caster_t ptr_caster((void*)ptr);
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std::size_t offset = ptr_caster.size() - this_caster.size();
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BOOST_ASSERT(offset != 1);
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return offset;
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}
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#else
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caster_t this_caster((void*)this_ptr);
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caster_t ptr_caster((void*)ptr);
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std::size_t offset = (ptr_caster.size() - this_caster.size() - 1) & -std::size_t(ptr != 0);
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++offset;
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return offset;
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#endif
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}
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#ifdef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_OFF
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#undef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_OFF
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#endif
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#ifdef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF
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#undef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF
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#endif
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////////////////////////////////////////////////////////////////////////
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//
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// offset_ptr_to_offset_from_other
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//
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////////////////////////////////////////////////////////////////////////
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#define BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_OFF_FROM_OTHER
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//Branchless seems slower in x86
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//#define BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF_FROM_OTHER
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template<int Dummy>
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#ifndef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_OFF_FROM_OTHER
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BOOST_INTERPROCESS_NEVER_INLINE
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#elif defined(NDEBUG)
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inline
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#endif
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std::size_t offset_ptr_to_offset_from_other
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(const volatile void *this_ptr, const volatile void *other_ptr, std::size_t other_offset)
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{
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typedef pointer_size_t_caster<void*> caster_t;
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#ifndef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF_FROM_OTHER
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if(other_offset == 1){
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return 1;
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}
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else{
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caster_t this_caster((void*)this_ptr);
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caster_t other_caster((void*)other_ptr);
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std::size_t offset = other_caster.size() - this_caster.size() + other_offset;
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BOOST_ASSERT(offset != 1);
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return offset;
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}
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#else
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caster_t this_caster((void*)this_ptr);
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caster_t other_caster((void*)other_ptr);
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std::size_t offset = (other_caster.size() - this_caster.size()) & -std::size_t(other_offset != 1);
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offset += other_offset;
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return offset;
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#endif
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}
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#ifdef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_OFF_FROM_OTHER
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#undef BOOST_INTERPROCESS_OFFSET_PTR_INLINE_TO_OFF_FROM_OTHER
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#endif
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#ifdef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF_FROM_OTHER
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#undef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF_FROM_OTHER
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#endif
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////////////////////////////////////////////////////////////////////////
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//
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// Let's assume cast to void and cv cast don't change any target address
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//
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////////////////////////////////////////////////////////////////////////
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template<class From, class To>
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struct offset_ptr_maintains_address
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{
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static const bool value = ipcdetail::is_cv_same<From, To>::value
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|| ipcdetail::is_cv_same<void, To>::value;
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};
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} //namespace ipcdetail {
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/// @endcond
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//!A smart pointer that stores the offset between between the pointer and the
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//!the object it points. This allows offset allows special properties, since
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//!the pointer is independent from the address address of the pointee, if the
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//!pointer and the pointee are still separated by the same offset. This feature
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//!converts offset_ptr in a smart pointer that can be placed in shared memory and
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//!memory mapped files mapped in different addresses in every process.
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template <class PointedType, class DifferenceType, class OffsetType, std::size_t OffsetAlignment>
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class offset_ptr
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{
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/// @cond
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typedef offset_ptr<PointedType, DifferenceType, OffsetType, OffsetAlignment> self_t;
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void unspecified_bool_type_func() const {}
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typedef void (self_t::*unspecified_bool_type)() const;
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/// @endcond
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public:
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typedef PointedType element_type;
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typedef PointedType * pointer;
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typedef typename ipcdetail::
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add_reference<PointedType>::type reference;
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typedef typename ipcdetail::
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remove_volatile<typename ipcdetail::
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remove_const<PointedType>::type
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>::type value_type;
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typedef DifferenceType difference_type;
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typedef std::random_access_iterator_tag iterator_category;
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typedef OffsetType offset_type;
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public: //Public Functions
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//!Default constructor (null pointer).
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//!Never throws.
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offset_ptr()
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: internal(1)
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{}
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//!Constructor from raw pointer (allows "0" pointer conversion).
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//!Never throws.
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offset_ptr(pointer ptr)
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: internal(static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset<0>(ptr, this)))
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{}
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//!Constructor from other pointer.
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//!Never throws.
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template <class T>
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offset_ptr( T *ptr
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, typename ipcdetail::enable_if< ipcdetail::is_convertible<T*, PointedType*> >::type * = 0)
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: internal(static_cast<OffsetType>
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(ipcdetail::offset_ptr_to_offset<0>(static_cast<PointedType*>(ptr), this)))
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{}
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//!Constructor from other offset_ptr
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//!Never throws.
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offset_ptr(const offset_ptr& ptr)
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: internal(static_cast<OffsetType>
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(ipcdetail::offset_ptr_to_offset_from_other<0>(this, &ptr, ptr.internal.m_offset)))
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{}
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//!Constructor from other offset_ptr. If pointers of pointee types are
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//!convertible, offset_ptrs will be convertibles. Never throws.
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template<class T2>
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offset_ptr( const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr
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#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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, typename ipcdetail::enable_if_c< ipcdetail::is_convertible<T2*, PointedType*>::value
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&& ipcdetail::offset_ptr_maintains_address<T2, PointedType>::value
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>::type * = 0
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#endif
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)
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: internal(static_cast<OffsetType>
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(ipcdetail::offset_ptr_to_offset_from_other<0>(this, &ptr, ptr.get_offset())))
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{}
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#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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//!Constructor from other offset_ptr. If pointers of pointee types are
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//!convertible, offset_ptrs will be convertibles. Never throws.
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template<class T2>
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offset_ptr( const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr
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, typename ipcdetail::enable_if_c< ipcdetail::is_convertible<T2*, PointedType*>::value
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&& !ipcdetail::offset_ptr_maintains_address<T2, PointedType>::value
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>::type * = 0)
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: internal(static_cast<OffsetType>
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(ipcdetail::offset_ptr_to_offset<0>(static_cast<PointedType*>(ptr.get()), this)))
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{}
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#endif
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//!Emulates static_cast operator.
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//!Never throws.
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template<class T2, class P2, class O2, std::size_t A2>
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offset_ptr(const offset_ptr<T2, P2, O2, A2> & r, ipcdetail::static_cast_tag)
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: internal(static_cast<OffsetType>
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(ipcdetail::offset_ptr_to_offset<0>(static_cast<PointedType*>(r.get()), this)))
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{}
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//!Emulates const_cast operator.
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//!Never throws.
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template<class T2, class P2, class O2, std::size_t A2>
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offset_ptr(const offset_ptr<T2, P2, O2, A2> & r, ipcdetail::const_cast_tag)
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: internal(static_cast<OffsetType>
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(ipcdetail::offset_ptr_to_offset<0>(const_cast<PointedType*>(r.get()), this)))
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{}
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//!Emulates dynamic_cast operator.
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//!Never throws.
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template<class T2, class P2, class O2, std::size_t A2>
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offset_ptr(const offset_ptr<T2, P2, O2, A2> & r, ipcdetail::dynamic_cast_tag)
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: internal(static_cast<OffsetType>
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(ipcdetail::offset_ptr_to_offset<0>(dynamic_cast<PointedType*>(r.get()), this)))
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{}
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//!Emulates reinterpret_cast operator.
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//!Never throws.
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template<class T2, class P2, class O2, std::size_t A2>
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offset_ptr(const offset_ptr<T2, P2, O2, A2> & r, ipcdetail::reinterpret_cast_tag)
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: internal(static_cast<OffsetType>
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(ipcdetail::offset_ptr_to_offset<0>(reinterpret_cast<PointedType*>(r.get()), this)))
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{}
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//!Obtains raw pointer from offset.
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//!Never throws.
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pointer get() const
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{ return (pointer)ipcdetail::offset_ptr_to_raw_pointer<0>(this, this->internal.m_offset); }
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offset_type get_offset() const
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{ return this->internal.m_offset; }
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//!Pointer-like -> operator. It can return 0 pointer.
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//!Never throws.
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pointer operator->() const
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{ return this->get(); }
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//!Dereferencing operator, if it is a null offset_ptr behavior
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//! is undefined. Never throws.
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reference operator* () const
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{
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pointer p = this->get();
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reference r = *p;
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return r;
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}
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//!Indexing operator.
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//!Never throws.
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reference operator[](difference_type idx) const
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{ return this->get()[idx]; }
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//!Assignment from pointer (saves extra conversion).
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//!Never throws.
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offset_ptr& operator= (pointer from)
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{
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this->internal.m_offset =
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static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset<0>(from, this));
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return *this;
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}
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//!Assignment from other offset_ptr.
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//!Never throws.
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offset_ptr& operator= (const offset_ptr & ptr)
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{
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this->internal.m_offset =
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static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset_from_other<0>(this, &ptr, ptr.internal.m_offset));
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return *this;
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}
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//!Assignment from related offset_ptr. If pointers of pointee types
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//! are assignable, offset_ptrs will be assignable. Never throws.
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template<class T2>
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#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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typename ipcdetail::enable_if_c< ipcdetail::is_convertible<T2*, PointedType*>::value
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&& ipcdetail::offset_ptr_maintains_address<T2, PointedType>::value
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, offset_ptr&>::type
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#else
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offset_ptr&
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#endif
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operator= (const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr)
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{
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this->internal.m_offset =
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static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset_from_other<0>(this, &ptr, ptr.get_offset()));
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return *this;
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}
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#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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template<class T2>
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typename ipcdetail::enable_if_c<ipcdetail::is_convertible<T2*, PointedType*>::value
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&& !ipcdetail::offset_ptr_maintains_address<T2, PointedType>::value
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, offset_ptr&>::type
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operator= (const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr)
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{
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this->internal.m_offset =
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static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset<0>(static_cast<PointedType*>(ptr.get()), this));
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return *this;
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}
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#endif
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//!offset_ptr += difference_type.
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//!Never throws.
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offset_ptr &operator+= (difference_type offset)
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{ this->inc_offset(offset * sizeof (PointedType)); return *this; }
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//!offset_ptr -= difference_type.
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//!Never throws.
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offset_ptr &operator-= (difference_type offset)
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{ this->dec_offset(offset * sizeof (PointedType)); return *this; }
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//!++offset_ptr.
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//!Never throws.
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offset_ptr& operator++ (void)
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{ this->inc_offset(sizeof (PointedType)); return *this; }
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//!offset_ptr++.
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//!Never throws.
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offset_ptr operator++ (int)
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{
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offset_ptr tmp(*this);
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this->inc_offset(sizeof (PointedType));
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return tmp;
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}
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//!--offset_ptr.
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//!Never throws.
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offset_ptr& operator-- (void)
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{ this->dec_offset(sizeof (PointedType)); return *this; }
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//!offset_ptr--.
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//!Never throws.
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offset_ptr operator-- (int)
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{
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offset_ptr tmp(*this);
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this->dec_offset(sizeof (PointedType));
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return tmp;
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}
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//!safe bool conversion operator.
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//!Never throws.
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operator unspecified_bool_type() const
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{ return this->internal.m_offset != 1? &self_t::unspecified_bool_type_func : 0; }
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//!Not operator. Not needed in theory, but improves portability.
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//!Never throws
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bool operator! () const
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{ return this->internal.m_offset == 1; }
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//!Compatibility with pointer_traits
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//!
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template <class U>
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struct rebind
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{ typedef offset_ptr<U, DifferenceType, OffsetType, OffsetAlignment> other; };
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//!Compatibility with pointer_traits
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//!
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static offset_ptr pointer_to(reference r)
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{ return offset_ptr(&r); }
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//!difference_type + offset_ptr
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//!operation
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friend offset_ptr operator+(difference_type diff, offset_ptr right)
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{ right += diff; return right; }
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//!offset_ptr + difference_type
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//!operation
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friend offset_ptr operator+(offset_ptr left, difference_type diff)
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{ left += diff; return left; }
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//!offset_ptr - diff
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//!operation
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friend offset_ptr operator-(offset_ptr left, difference_type diff)
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{ left -= diff; return left; }
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//!offset_ptr - diff
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//!operation
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friend offset_ptr operator-(difference_type diff, offset_ptr right)
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{ right -= diff; return right; }
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//!offset_ptr - offset_ptr
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//!operation
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friend difference_type operator-(const offset_ptr &pt, const offset_ptr &pt2)
|
|
{ return difference_type(pt.get()- pt2.get()); }
|
|
|
|
//Comparison
|
|
friend bool operator== (const offset_ptr &pt1, const offset_ptr &pt2)
|
|
{ return pt1.get() == pt2.get(); }
|
|
|
|
friend bool operator!= (const offset_ptr &pt1, const offset_ptr &pt2)
|
|
{ return pt1.get() != pt2.get(); }
|
|
|
|
friend bool operator<(const offset_ptr &pt1, const offset_ptr &pt2)
|
|
{ return pt1.get() < pt2.get(); }
|
|
|
|
friend bool operator<=(const offset_ptr &pt1, const offset_ptr &pt2)
|
|
{ return pt1.get() <= pt2.get(); }
|
|
|
|
friend bool operator>(const offset_ptr &pt1, const offset_ptr &pt2)
|
|
{ return pt1.get() > pt2.get(); }
|
|
|
|
friend bool operator>=(const offset_ptr &pt1, const offset_ptr &pt2)
|
|
{ return pt1.get() >= pt2.get(); }
|
|
|
|
//Comparison to raw ptr to support literal 0
|
|
friend bool operator== (pointer pt1, const offset_ptr &pt2)
|
|
{ return pt1 == pt2.get(); }
|
|
|
|
friend bool operator!= (pointer pt1, const offset_ptr &pt2)
|
|
{ return pt1 != pt2.get(); }
|
|
|
|
friend bool operator<(pointer pt1, const offset_ptr &pt2)
|
|
{ return pt1 < pt2.get(); }
|
|
|
|
friend bool operator<=(pointer pt1, const offset_ptr &pt2)
|
|
{ return pt1 <= pt2.get(); }
|
|
|
|
friend bool operator>(pointer pt1, const offset_ptr &pt2)
|
|
{ return pt1 > pt2.get(); }
|
|
|
|
friend bool operator>=(pointer pt1, const offset_ptr &pt2)
|
|
{ return pt1 >= pt2.get(); }
|
|
|
|
//Comparison
|
|
friend bool operator== (const offset_ptr &pt1, pointer pt2)
|
|
{ return pt1.get() == pt2; }
|
|
|
|
friend bool operator!= (const offset_ptr &pt1, pointer pt2)
|
|
{ return pt1.get() != pt2; }
|
|
|
|
friend bool operator<(const offset_ptr &pt1, pointer pt2)
|
|
{ return pt1.get() < pt2; }
|
|
|
|
friend bool operator<=(const offset_ptr &pt1, pointer pt2)
|
|
{ return pt1.get() <= pt2; }
|
|
|
|
friend bool operator>(const offset_ptr &pt1, pointer pt2)
|
|
{ return pt1.get() > pt2; }
|
|
|
|
friend bool operator>=(const offset_ptr &pt1, pointer pt2)
|
|
{ return pt1.get() >= pt2; }
|
|
|
|
friend void swap(offset_ptr &left, offset_ptr &right)
|
|
{
|
|
pointer ptr = right.get();
|
|
right = left;
|
|
left = ptr;
|
|
}
|
|
|
|
private:
|
|
/// @cond
|
|
void inc_offset(DifferenceType bytes)
|
|
{ internal.m_offset += bytes; }
|
|
|
|
void dec_offset(DifferenceType bytes)
|
|
{ internal.m_offset -= bytes; }
|
|
|
|
ipcdetail::offset_ptr_internal<OffsetType, OffsetAlignment> internal;
|
|
/// @endcond
|
|
};
|
|
|
|
//!operator<<
|
|
//!for offset ptr
|
|
template<class E, class T, class W, class X, class Y, std::size_t Z>
|
|
inline std::basic_ostream<E, T> & operator<<
|
|
(std::basic_ostream<E, T> & os, offset_ptr<W, X, Y, Z> const & p)
|
|
{ return os << p.get_offset(); }
|
|
|
|
//!operator>>
|
|
//!for offset ptr
|
|
template<class E, class T, class W, class X, class Y, std::size_t Z>
|
|
inline std::basic_istream<E, T> & operator>>
|
|
(std::basic_istream<E, T> & is, offset_ptr<W, X, Y, Z> & p)
|
|
{ return is >> p.get_offset(); }
|
|
|
|
//!Simulation of static_cast between pointers. Never throws.
|
|
template<class T1, class P1, class O1, std::size_t A1, class T2, class P2, class O2, std::size_t A2>
|
|
inline boost::interprocess::offset_ptr<T1, P1, O1, A1>
|
|
static_pointer_cast(const boost::interprocess::offset_ptr<T2, P2, O2, A2> & r)
|
|
{
|
|
return boost::interprocess::offset_ptr<T1, P1, O1, A1>
|
|
(r, boost::interprocess::ipcdetail::static_cast_tag());
|
|
}
|
|
|
|
//!Simulation of const_cast between pointers. Never throws.
|
|
template<class T1, class P1, class O1, std::size_t A1, class T2, class P2, class O2, std::size_t A2>
|
|
inline boost::interprocess::offset_ptr<T1, P1, O1, A1>
|
|
const_pointer_cast(const boost::interprocess::offset_ptr<T2, P2, O2, A2> & r)
|
|
{
|
|
return boost::interprocess::offset_ptr<T1, P1, O1, A1>
|
|
(r, boost::interprocess::ipcdetail::const_cast_tag());
|
|
}
|
|
|
|
//!Simulation of dynamic_cast between pointers. Never throws.
|
|
template<class T1, class P1, class O1, std::size_t A1, class T2, class P2, class O2, std::size_t A2>
|
|
inline boost::interprocess::offset_ptr<T1, P1, O1, A1>
|
|
dynamic_pointer_cast(const boost::interprocess::offset_ptr<T2, P2, O2, A2> & r)
|
|
{
|
|
return boost::interprocess::offset_ptr<T1, P1, O1, A1>
|
|
(r, boost::interprocess::ipcdetail::dynamic_cast_tag());
|
|
}
|
|
|
|
//!Simulation of reinterpret_cast between pointers. Never throws.
|
|
template<class T1, class P1, class O1, std::size_t A1, class T2, class P2, class O2, std::size_t A2>
|
|
inline boost::interprocess::offset_ptr<T1, P1, O1, A1>
|
|
reinterpret_pointer_cast(const boost::interprocess::offset_ptr<T2, P2, O2, A2> & r)
|
|
{
|
|
return boost::interprocess::offset_ptr<T1, P1, O1, A1>
|
|
(r, boost::interprocess::ipcdetail::reinterpret_cast_tag());
|
|
}
|
|
|
|
} //namespace interprocess {
|
|
|
|
/// @cond
|
|
|
|
//!has_trivial_constructor<> == true_type specialization for optimizations
|
|
template <class T, class P, class O, std::size_t A>
|
|
struct has_trivial_constructor< boost::interprocess::offset_ptr<T, P, O, A> >
|
|
{
|
|
static const bool value = true;
|
|
};
|
|
|
|
///has_trivial_destructor<> == true_type specialization for optimizations
|
|
template <class T, class P, class O, std::size_t A>
|
|
struct has_trivial_destructor< boost::interprocess::offset_ptr<T, P, O, A> >
|
|
{
|
|
static const bool value = true;
|
|
};
|
|
|
|
|
|
namespace interprocess {
|
|
|
|
//!to_raw_pointer() enables boost::mem_fn to recognize offset_ptr.
|
|
//!Never throws.
|
|
template <class T, class P, class O, std::size_t A>
|
|
inline T * to_raw_pointer(boost::interprocess::offset_ptr<T, P, O, A> const & p)
|
|
{ return ipcdetail::to_raw_pointer(p); }
|
|
|
|
} //namespace interprocess
|
|
|
|
|
|
/// @endcond
|
|
} //namespace boost {
|
|
|
|
/// @cond
|
|
|
|
namespace boost{
|
|
|
|
//This is to support embedding a bit in the pointer
|
|
//for intrusive containers, saving space
|
|
namespace intrusive {
|
|
|
|
//Predeclaration to avoid including header
|
|
template<class VoidPointer, std::size_t N>
|
|
struct max_pointer_plus_bits;
|
|
|
|
template<std::size_t OffsetAlignment, class P, class O, std::size_t A>
|
|
struct max_pointer_plus_bits<boost::interprocess::offset_ptr<void, P, O, A>, OffsetAlignment>
|
|
{
|
|
//The offset ptr can embed one bit less than the alignment since it
|
|
//uses offset == 1 to store the null pointer.
|
|
static const std::size_t value = ::boost::interprocess::ipcdetail::ls_zeros<OffsetAlignment>::value - 1;
|
|
};
|
|
|
|
//Predeclaration
|
|
template<class Pointer, std::size_t NumBits>
|
|
struct pointer_plus_bits;
|
|
|
|
template<class T, class P, class O, std::size_t A, std::size_t NumBits>
|
|
struct pointer_plus_bits<boost::interprocess::offset_ptr<T, P, O, A>, NumBits>
|
|
{
|
|
typedef boost::interprocess::offset_ptr<T, P, O, A> pointer;
|
|
typedef ::boost::interprocess::pointer_size_t_caster<T*> caster_t;
|
|
//Bits are stored in the lower bits of the pointer except the LSB,
|
|
//because this bit is used to represent the null pointer.
|
|
static const std::size_t Mask = ((std::size_t(1) << NumBits) - 1) << 1u;
|
|
|
|
static pointer get_pointer(const pointer &n)
|
|
{
|
|
caster_t caster(n.get());
|
|
return pointer(caster_t(caster.size() & ~Mask).pointer());
|
|
}
|
|
|
|
static void set_pointer(pointer &n, const pointer &p)
|
|
{
|
|
caster_t n_caster(n.get());
|
|
caster_t p_caster(p.get());
|
|
BOOST_ASSERT(0 == (p_caster.size() & Mask));
|
|
n = caster_t(p_caster.size() | (n_caster.size() & Mask)).pointer();
|
|
}
|
|
|
|
static std::size_t get_bits(const pointer &n)
|
|
{ return (caster_t(n.get()).size() & Mask) >> 1u; }
|
|
|
|
static void set_bits(pointer &n, std::size_t b)
|
|
{
|
|
BOOST_ASSERT(b < (std::size_t(1) << NumBits));
|
|
caster_t n_caster(n.get());
|
|
n = caster_t((n_caster.size() & ~Mask) | (b << 1u)).pointer();
|
|
}
|
|
};
|
|
|
|
} //namespace intrusive
|
|
|
|
//Predeclaration
|
|
template<class T, class U>
|
|
struct pointer_to_other;
|
|
|
|
//Backwards compatibility with pointer_to_other
|
|
template <class PointedType, class DifferenceType, class OffsetType, std::size_t OffsetAlignment, class U>
|
|
struct pointer_to_other
|
|
< ::boost::interprocess::offset_ptr<PointedType, DifferenceType, OffsetType, OffsetAlignment>, U >
|
|
{
|
|
typedef ::boost::interprocess::offset_ptr<U, DifferenceType, OffsetType, OffsetAlignment> type;
|
|
};
|
|
|
|
} //namespace boost{
|
|
/// @endcond
|
|
|
|
#include <boost/interprocess/detail/config_end.hpp>
|
|
|
|
#endif //#ifndef BOOST_INTERPROCESS_OFFSET_PTR_HPP
|