[flat.multiset.erasure]

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template<class Key, class Compare, class KeyContainer, class Predicate>
  constexpr typename flat_multiset<Key, Compare, KeyContainer>::size_type
    erase_if(flat_multiset<Key, Compare, KeyContainer>& c, Predicate pred);

Complexity: Exactly c.size() applications of the predicate.

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]

23 Containers library [containers]

23.6 Container adaptors [container.adaptors]

23.6.12 Class template flat_multiset [flat.multiset]

23.6.12.6 Erasure [flat.multiset.erasure]