dispose method

@override void dispose()

Releases the native object. Idempotent.

Implementation

@override
void dispose() {
  if (!_instantiated) {
    // Never instantiated, so no store took ownership of the trampolines.
    for (final trampoline in _trampolines) {
      trampoline.close();
    }
  }
  _trampolines.clear();
  super.dispose();
}