tmp/tmpytcsjnnw/{from.md → to.md}
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#### Erasure <a id="flat.multiset.erasure">[[flat.multiset.erasure]]</a>
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``` cpp
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template<class Key, class Compare, class KeyContainer, class Predicate>
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typename flat_multiset<Key, Compare, KeyContainer>::size_type
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erase_if(flat_multiset<Key, Compare, KeyContainer>& c, Predicate pred);
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```
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*Preconditions:* `Key` meets the *Cpp17MoveAssignable* requirements.
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*Effects:* Let E be `bool(pred(as_const(e)))`. Erases all elements `e`
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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`
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exits via an exception, `c` is in a valid but unspecified
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state [[defns.valid]].
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[*Note 1*: `c` still meets its invariants, but can be
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empty. — *end note*]
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