24 Containers library [containers]

24.4 Associative containers [associative]

24.4.5 Class template multimap [multimap]

24.4.5.3 Modifiers [multimap.modifiers]

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template<class P> iterator insert(P&& x); template<class P> iterator insert(const_iterator position, P&& x);
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Constraints: is_constructible_v<value_type, P&&> is true.
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Effects: The first form is equivalent to return emplace(std​::​forward<P>(x)).
The second form is equivalent to return emplace_hint(position, std​::​forward<P>(x)).