is_context_template method Null safety

Implementation

bool is_context_template() {
  final constructor =
  _dll_handle.lookupFunction<_Context_isContextTemplate_c, _Context_isContextTemplate_dart>(_context_namespace + 'isContextTemplate');
  final exception = _getException();
  bool res = constructor(this._impl, exception);

  tdvCheckException(exception, _dll_handle);

  return res;
}