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This introduces a new RAII type to simplify the emplace members which currently use try-catch blocks to deallocate a node if an exception is thrown by the comparisons done during insertion. The new type is created on the stack and manages the allocation of a new node and deallocates it in the destructor if it wasn't inserted into the tree. It also provides helper functions for doing the insertion, releasing ownership of the node to the tree. Also, we don't need to use long qualified names if we put the return type after the nested-name-specifier. libstdc++-v3/ChangeLog: * include/bits/stl_tree.h (_Rb_tree::_Auto_node): Define new RAII helper for creating and inserting new nodes. (_Rb_tree::_M_insert_node): Use trailing-return-type to simplify out-of-line definition. (_Rb_tree::_M_insert_lower_node): Likewise. (_Rb_tree::_M_insert_equal_lower_node): Likewise. (_Rb_tree::_M_emplace_unique): Likewise. Use _Auto_node. (_Rb_tree::_M_emplace_equal): Likewise. (_Rb_tree::_M_emplace_hint_unique): Likewise. (_Rb_tree::_M_emplace_hint_equal): Likewise.
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