diff options
| -rw-r--r-- | libcxx/include/unordered_map | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/libcxx/include/unordered_map b/libcxx/include/unordered_map index 85a54a7b6dd..0242cde8335 100644 --- a/libcxx/include/unordered_map +++ b/libcxx/include/unordered_map @@ -922,8 +922,32 @@ public: #ifndef _LIBCPP_HAS_NO_VARIADICS template <class... _Args> - pair<iterator, bool> emplace(_Args&&... __args); + pair<iterator, bool> emplace(_Args&&... __args) + {return __emplace_dispatch(std::forward<_Args>(__args)...);} +private: + template <class _Arg> + pair<iterator, bool> __emplace_dispatch(_Arg&& __arg) + { + typedef is_constructible<value_type, _Arg> __constructible; + return __emplace_insert_if_constructible(std::forward<_Arg>(__arg), + __constructible()); + } + template <class _Arg1, class... _Args> + pair<iterator, bool> __emplace_dispatch(_Arg1&& __arg1, _Args&&... __args) + {return __emplace_impl(std::forward<_Arg1>(__arg1), std::forward<_Args>(__args)...);} + + template <class _Arg> + pair<iterator, bool> __emplace_insert_if_constructible(_Arg&& __arg, false_type) + {return __emplace_impl(std::forward<_Arg>(__arg));} + template <class _Arg> + pair<iterator, bool> __emplace_insert_if_constructible(_Arg&& __arg, true_type) + {return insert(std::forward<_Arg>(__arg));} + + template <class... _Args> + pair<iterator, bool> __emplace_impl(_Args&&... __args); + +public: template <class... _Args> _LIBCPP_INLINE_VISIBILITY #if _LIBCPP_DEBUG_LEVEL >= 2 @@ -932,7 +956,7 @@ public: _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this, "unordered_map::emplace_hint(const_iterator, args...) called with an iterator not" " referring to this unordered_map"); - return __table_.__emplace_unique(_VSTD::forward<_Args>(__args)...).first; + return emplace(_VSTD::forward<_Args>(__args)...).first; } #else iterator emplace_hint(const_iterator, _Args&&... __args) @@ -1477,7 +1501,7 @@ unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::__construct_node(_A0&& __a0, template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc> template <class... _Args> pair<typename unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::iterator, bool> -unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::emplace(_Args&&... __args) +unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::__emplace_impl(_Args&&... __args) { __node_holder __h = __construct_node(_VSTD::forward<_Args>(__args)...); pair<iterator, bool> __r = __table_.__node_insert_unique(__h.get()); |
