{ return __node_gen(std::forward<_Kt>(__k)); }
};
+ template<typename _HashtableAlloc, typename _NodePtr>
+ struct _NodePtrGuard
+ {
+ _HashtableAlloc& _M_h;
+ _NodePtr _M_ptr;
+
+ ~_NodePtrGuard()
+ {
+ if (_M_ptr)
+ _M_h._M_deallocate_node_ptr(_M_ptr);
+ }
+ };
+
template<typename _NodeAlloc>
struct _Hashtable_alloc;
__node_ptr
operator()(_Args&&... __args) const
{
- if (_M_nodes)
- {
- __node_ptr __node = _M_nodes;
- _M_nodes = _M_nodes->_M_next();
- __node->_M_nxt = nullptr;
- auto& __a = _M_h._M_node_allocator();
- __node_alloc_traits::destroy(__a, __node->_M_valptr());
- __try
- {
- __node_alloc_traits::construct(__a, __node->_M_valptr(),
- std::forward<_Args>(__args)...);
- }
- __catch(...)
- {
- _M_h._M_deallocate_node_ptr(__node);
- __throw_exception_again;
- }
- return __node;
- }
- return _M_h._M_allocate_node(std::forward<_Args>(__args)...);
+ if (!_M_nodes)
+ return _M_h._M_allocate_node(std::forward<_Args>(__args)...);
+
+ __node_ptr __node = _M_nodes;
+ _M_nodes = _M_nodes->_M_next();
+ __node->_M_nxt = nullptr;
+ auto& __a = _M_h._M_node_allocator();
+ __node_alloc_traits::destroy(__a, __node->_M_valptr());
+ _NodePtrGuard<__hashtable_alloc, __node_ptr> __guard { _M_h, __node };
+ __node_alloc_traits::construct(__a, __node->_M_valptr(),
+ std::forward<_Args>(__args)...);
+ __guard._M_ptr = nullptr;
+ return __node;
}
private: