24 Containers library [containers]

24.6 Container adaptors [container.adaptors]

24.6.10 Class template flat_multimap [flat.multimap]

24.6.10.4 Erasure [flat.multimap.erasure]

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template<class Key, class T, class Compare, class KeyContainer, class MappedContainer, class Predicate> typename flat_multimap<Key, T, Compare, KeyContainer, MappedContainer>::size_type erase_if(flat_multimap<Key, T, Compare, KeyContainer, MappedContainer>& c, Predicate pred);
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Preconditions: Key and T meet the Cpp17MoveAssignable requirements.
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Effects: Let E be bool(pred(pair<const Key&, const T&>(e))).
Erases all elements e in c for which E holds.
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Returns: The number of elements erased.
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Complexity: Exactly c.size() applications of the predicate.
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Remarks: Stable ([algorithm.stable]).
If an invocation of erase_if exits via an exception, c is in a valid but unspecified state ([defns.valid]).
[Note 1: 
c still meets its invariants, but can be empty.
— end note]