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Clean up concurrent_table's merge impl

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This commit is contained in:
Christian Mazakas
2023-05-05 11:47:20 -07:00
parent 99b0868283
commit 5b775345ba
1 changed files with 14 additions and 18 deletions
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32
include/boost/unordered/detail/foa/concurrent_table.hpp
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@ -14,6 +14,7 @@
#include <atomic>
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/core/ignore_unused.hpp>
#include <boost/core/no_exceptions_support.hpp>
#include <boost/cstdint.hpp>
#include <boost/mp11/tuple.hpp>
@ -692,11 +693,14 @@ public:
using merge_table_type=concurrent_table<TypePolicy,Hash2,Pred2,Allocator>;
using super2=typename merge_table_type::super;
// for clang
boost::ignore_unused<super2>();
auto lck=exclusive_access(*this,x);
size_type s=unprotected_size();
static_cast<super2&>(x).for_all_elements( /* super::for_all_elements -> unprotected */
x.super2::for_all_elements( /* super2::for_all_elements -> unprotected */
[&,this](group_type* pg,unsigned int n,element_type* p){
erase_on_exit<merge_table_type> e{x,pg,n,p};
typename merge_table_type::erase_on_exit e{x,pg,n,p};
if(!unprotected_emplace(type_policy::move(*p)))e.rollback();
});
return size_type{unprotected_size()-s};
@ -852,29 +856,21 @@ private:
>::type
cast_for(group_exclusive,value_type& x){return x;}
template<typename Table>
struct erase_on_exit
{
using table_group_type=typename Table::group_type;
using table_element_type=typename Table::element_type;
using table_super_type=typename Table::super;
erase_on_exit(
Table& x_,table_group_type* pg_,unsigned int pos_,table_element_type* p_):
concurrent_table& x_,
group_type* pg_,unsigned int pos_,element_type* p_):
x{x_},pg{pg_},pos{pos_},p{p_}{}
~erase_on_exit()
{
if(!rollback_)
static_cast<table_super_type&>(x).erase(pg,pos,p);
}
~erase_on_exit(){if(!rollback_)x.super::erase(pg,pos,p);}
void rollback(){rollback_=true;}
Table &x;
table_group_type *pg;
unsigned int pos;
table_element_type *p;
bool rollback_=false;
concurrent_table &x;
group_type *pg;
unsigned int pos;
element_type *p;
bool rollback_=false;
};
template<typename GroupAccessMode,typename Key,typename F>