node_graph_interface_traits.hpp

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// Copyright 2020 Open Source Robotics Foundation, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef RCLCPP__NODE_INTERFACES__NODE_GRAPH_INTERFACE_TRAITS_HPP_
#define RCLCPP__NODE_INTERFACES__NODE_GRAPH_INTERFACE_TRAITS_HPP_
 
#include <functional>
#include <type_traits>
 
#include "rclcpp/node_interfaces/node_graph_interface.hpp"
 
namespace rclcpp
{
namespace node_interfaces
{
 
template<class T, typename = void>
struct has_node_graph_interface : std::false_type
{};
 
template<class T>
struct has_node_graph_interface<
  T, typename std::enable_if<
    std::is_same<
      std::shared_ptr<rclcpp::node_interfaces::NodeGraphInterface>,
      decltype(std::declval<T>().get_node_graph_interface())>::value>::type> : std::true_type
{};
 
}  // namespace node_interfaces
}  // namespace rclcpp
 
#endif  // RCLCPP__NODE_INTERFACES__NODE_GRAPH_INTERFACE_TRAITS_HPP_