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Reify implementation of node_handle's move assignment operator

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This commit is contained in:
Christian Mazakas
2023-02-19 21:13:37 -08:00
parent 5986f75d16
commit 34ed463bea
1 changed files with 33 additions and 23 deletions
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56
include/boost/unordered/detail/foa/node_handle.hpp
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@ -105,32 +105,42 @@ struct node_handle_base
node_handle_base& operator=(node_handle_base&& nh)noexcept
{
bool const pocma=
boost::allocator_propagate_on_container_move_assignment<
Allocator>::type::value;
if(this!=&nh){
if(empty()){
if(nh.empty()){ /* empty(), nh.empty() */
/* nothing to do */
}else{ /* empty(), !nh.empty() */
emplace(nh.p_,std::move(nh.al()));
nh.reset();
}
}else{
if(nh.empty()){ /* !empty(), nh.empty() */
type_policy::destroy(al(),p_);
reset();
}else{ /* !empty(), !nh.empty() */
bool const pocma=
boost::allocator_propagate_on_container_move_assignment<
Allocator>::type::value;
BOOST_ASSERT(
pocma
||empty()
||nh.empty()
||(al()==nh.al()));
BOOST_ASSERT(pocma||al()==nh.al());
if(!empty()){
type_policy::destroy(al(),p_);
if (pocma&&!nh.empty()){al()=std::move(nh.al());}
type_policy::destroy(al(),p_);
if(pocma){
al()=std::move(nh.al());
}
p_=nh.p_;
nh.reset();
}
}
}else{
if(empty()){ /* empty(), nh.empty() */
/* nothing to do */
}else{ /* !empty(), !nh.empty() */
type_policy::destroy(al(),p_);
reset();
}
}
if(!nh.empty()){
if(empty()){new(&a_.t_)Allocator(std::move(nh.al()));}
p_=nh.p_;
nh.p_=nullptr;
nh.a_.t_.~Allocator();
}else if (!empty()){
a_.t_.~Allocator();
p_=nullptr;
}
return *this;
}