unlike xref:#concurrent_node_map_emplace[emplace], which simply forwards all arguments to ``value_type``'s constructor.
unlike与 xref:#concurrent_node_map_emplace[emplace], which simply forwards all arguments to ``value_type``'s constructor.不同,该函数会直接将所有参数转发给 `value_type` 的构造函数。
unlike与 xref:#concurrent_node_map_emplace[emplace], which simply forwards all arguments to ``value_type``'s constructor.不同,该函数会直接将所有参数转发给 `value_type` 的构造函数。