DCHECK(IsEmpty());
    op_ = std::move(op);
  }

  void set_assigned_device(string assigned_device) {
    DCHECK(IsEmpty());
    assigned_device_ = std::move(assigned_device);
  }

  void set_constant_value(Tensor constant_value) {
    DCHECK(IsEmpty());
    constant_value_ = std::move(constant_value);
    op_ = "Const";
  }

  void set_inputs(InputSeqMatcher inputs) {
    DCHECK(IsEmpty());

  return props;
}

NodeMatcherProperties ConstantValue(
    const ::tensorflow::Input::Initializer& val) {
  TF_CHECK_OK(val.status);
  NodeMatcherProperties props;
  props.set_constant_value(val.tensor);
  return props;
}

::testing::Matcher<impl::OutEdge> Const(
    const ::tensorflow::Input::Initializer& val) {
  return Out(NodeWith(ConstantValue(val)));
}