/* Copyright 2020 Alibaba Group Holding Limited. All Rights Reserved.

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 EULER_CORE_DAG_EDGE_H_
#define EULER_CORE_DAG_EDGE_H_

#include <functional>

namespace euler {

class DAGNode;

class DAGEdge {
 public:
  int id() { return id_; }

  DAGNode* src() const { return src_; }
  DAGNode* dst() const { return dst_; }

  int src_output() { return src_output_; }
  int dst_input() { return dst_input_; }

 private:
  friend class DAG;
  DAGEdge() { }

  int id_;
  DAGNode* src_;
  DAGNode* dst_;
  int src_output_;
  int dst_input_;

  DISALLOW_COPY_AND_ASSIGN(DAGEdge);
};

}  //  namespace euler

#endif  // EULER_CORE_DAG_EDGE_H_
