cvRunAsync1<T> function

Future<T> cvRunAsync1<T>(Pointer<CvStatus> func(CvCallback_1 callback), void onComplete(Completer<T> completer, VoidPtr p))

Implementation

Future<T> cvRunAsync1<T>(
  ffi.Pointer<cvg.CvStatus> Function(cvg.CvCallback_1 callback) func,
  void Function(Completer<T> completer, VoidPtr p) onComplete,
) {
  final completer = Completer<T>();
  late final ffi.NativeCallable<cvg.CvCallback_1Function> ccallback;
  var closed = false;
  void close() {
    if (!closed) {
      closed = true;
      ccallback.close();
    }
  }

  void onResponse(VoidPtr p) {
    onComplete(completer, p);
    close();
  }

  ccallback = ffi.NativeCallable.listener(onResponse);
  try {
    throwIfFailed(func(ccallback.nativeFunction));
  } catch (_) {
    close();
    rethrow;
  }
  return completer.future;
}