22 Containers library [containers]

22.5 Unordered associative containers [unord]

22.5.4 Class template unordered_­map [unord.map]

22.5.4.5 Erasure [unord.map.erasure]

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template<class K, class T, class H, class P, class A, class Predicate> typename unordered_map<K, T, H, P, A>::size_type erase_if(unordered_map<K, T, H, P, A>& 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();