unlike xref:#unordered_node_map_emplace[emplace], which simply forwards all arguments to ``value_type``'s constructor.
unlike与 xref:#unordered_node_map_emplace[emplace], which simply forwards all arguments to ``value_type``'s constructor.不同,后者只是将所有参数直接转发给 `value_type` 的构造函数。
unlike与 xref:#unordered_node_map_emplace[emplace], which simply forwards all arguments to ``value_type``'s constructor.不同,后者只是将所有参数直接转发给 `value_type` 的构造函数。