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Clean up implementation of emplace_dispatch(false_type)

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This commit is contained in:
Christian Mazakas
2023-01-31 10:31:52 -08:00
parent e5320df017
commit 16099478db
1 changed files with 23 additions and 31 deletions
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54
include/boost/unordered/detail/foa.hpp
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@ -1400,37 +1400,6 @@ public:
std::forward<Args>(args)...); std::forward<Args>(args)...);
} }
template<typename... Args>
BOOST_FORCEINLINE std::pair<iterator,bool> emplace_dispatch(
std::true_type,Args&&... args
) {
using emplace_type_t = emplace_type<Args...>;
return emplace_impl(emplace_type_t(std::forward<Args>(args)...));
}
template<typename... Args>
BOOST_FORCEINLINE std::pair<iterator,bool> emplace_dispatch(
std::false_type,Args&&... args
) {
struct guard {
table& t;
element_type& x;
bool destroy;
~guard(){
if(destroy) {
type_policy::destroy(t.al(),&x);
}
}
};
element_type x;
type_policy::construct(al(),&x,std::forward<Args>(args)...);
guard g{*this,x,true};
auto itp=emplace_impl(type_policy::move(x));
g.destroy=!itp.second;
return itp;
}
template<typename Key,typename... Args> template<typename Key,typename... Args>
BOOST_FORCEINLINE std::pair<iterator,bool> try_emplace( BOOST_FORCEINLINE std::pair<iterator,bool> try_emplace(
Key&& x,Args&&... args) Key&& x,Args&&... args)
@ -1887,6 +1856,29 @@ private:
#pragma warning(pop) /* C4800 */ #pragma warning(pop) /* C4800 */
#endif #endif
template<typename... Args>
BOOST_FORCEINLINE std::pair<iterator,bool> emplace_dispatch(
std::true_type,Args&&... args
) {
using emplace_type_t = emplace_type<Args...>;
return emplace_impl(emplace_type_t(std::forward<Args>(args)...));
}
template<typename... Args>
BOOST_FORCEINLINE std::pair<iterator,bool> emplace_dispatch(
std::false_type,Args&&... args
) {
alignas(element_type)
unsigned char buf[sizeof(element_type)];
element_type* p = reinterpret_cast<element_type*>(buf);
type_policy::construct(al(),p,std::forward<Args>(args)...);
destroy_element_on_exit d{this,p};
(void)d;
return emplace_impl(type_policy::move(*p));
}
template<typename... Args> template<typename... Args>
BOOST_FORCEINLINE std::pair<iterator,bool> emplace_impl(Args&&... args) BOOST_FORCEINLINE std::pair<iterator,bool> emplace_impl(Args&&... args)
{ {