containsValueNoPurge method

@override bool containsValueNoPurge(Object? value)

Returns true if any entry currently maps to value.

Same as containsValue, but does NOT purge entries whose key or value has already been collected. It performs a direct scan and may therefore temporarily report true for stale keys.

Implementation

@override
bool containsValueNoPurge(Object? value) {
  if (value == null || value is! V) return false;

  var v = _EntryKey<V, K>(value);
  // ignore: collection_methods_unrelated_type
  var valueEntry = _mapValues[v];
  if (valueEntry == null) return false;

  var eValue = valueEntry.target;
  return eValue != null;
}