add method

@override Future<int> add(T value)

Adds a value and returns its generated key, updating the index.

Implementation

@override
Future<int> add(T value) {
  if (nativeBox.isIntKey) {
    return _lock.operation("ADD").run(() async {
      final id = await nativeBox.add(value);
      await _engine.onPut(id as K, value);
      _invalidateTokensFor(value);
      await _stampSnapshot();
      return id;
    });
  } else {
    throw InvalidAddOperationException<K>(boxName: name);
  }
}