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Use launder to make sure compilers assume that a parent type exists and it's alive

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This commit is contained in:
Ion Gaztañaga
2024-08-11 20:59:03 +02:00
parent b9b83bd9e6
commit 008795c556
1 changed files with 5 additions and 4 deletions
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9
include/boost/intrusive/detail/parent_from_member.hpp
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@ -22,6 +22,7 @@
#include <boost/intrusive/detail/config_begin.hpp> #include <boost/intrusive/detail/config_begin.hpp>
#include <boost/intrusive/detail/workaround.hpp> #include <boost/intrusive/detail/workaround.hpp>
#include <boost/move/detail/launder.hpp>
#include <cstddef> #include <cstddef>
#if defined(_MSC_VER) #if defined(_MSC_VER)
@ -90,15 +91,15 @@ BOOST_INTRUSIVE_FORCEINLINE std::ptrdiff_t offset_from_pointer_to_member(const M
template<class Parent, class Member> template<class Parent, class Member>
BOOST_INTRUSIVE_FORCEINLINE Parent *parent_from_member(Member *member, const Member Parent::* ptr_to_member) BOOST_INTRUSIVE_FORCEINLINE Parent *parent_from_member(Member *member, const Member Parent::* ptr_to_member)
{ {
return reinterpret_cast<Parent*> return boost::move_detail::launder(reinterpret_cast<Parent*>
(reinterpret_cast<std::size_t>(member) - static_cast<std::size_t>(offset_from_pointer_to_member(ptr_to_member))); (reinterpret_cast<std::size_t>(member) - static_cast<std::size_t>(offset_from_pointer_to_member(ptr_to_member))));
} }
template<class Parent, class Member> template<class Parent, class Member>
BOOST_INTRUSIVE_FORCEINLINE const Parent *parent_from_member(const Member *member, const Member Parent::* ptr_to_member) BOOST_INTRUSIVE_FORCEINLINE const Parent *parent_from_member(const Member *member, const Member Parent::* ptr_to_member)
{ {
return reinterpret_cast<const Parent*> return boost::move_detail::launder(reinterpret_cast<const Parent*>
( reinterpret_cast<std::size_t>(member) - static_cast<std::size_t>(offset_from_pointer_to_member(ptr_to_member)) ); ( reinterpret_cast<std::size_t>(member) - static_cast<std::size_t>(offset_from_pointer_to_member(ptr_to_member)) ));
} }
} //namespace detail { } //namespace detail {