22 Containers library [containers]

22.2 Container requirements [container.requirements]

22.2.5 Insert return type [container.insert.return]

1
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The associative containers with unique keys and the unordered containers with unique keys have a member function insert that returns a nested type insert_­return_­type.
That return type is a specialization of the template specified in this subclause.
template<class Iterator, class NodeType> struct insert-return-type { Iterator position; bool inserted; NodeType node; };
2
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The name insert-return-type is exposition only.
insert-return-type has the template parameters, data members, and special members specified above.
It has no base classes or members other than those specified.