22 Containers library [containers]

22.4 Associative containers [associative]

22.4.7 Class template multiset [multiset]

22.4.7.3 Erasure [multiset.erasure]

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template<class Key, class Compare, class Allocator, class Predicate> typename multiset<Key, Compare, Allocator>::size_type erase_if(multiset<Key, Compare, Allocator>& c, Predicate pred);
1
#
Effects: Equivalent to: 
auto original_size = c.size();
for (auto i = c.begin(), last = c.end(); i != last; ) {
  if (pred(*i)) {
    i = c.erase(i);
  } else {
    ++i;
  }
}
return original_size - c.size();