Chainable.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2015 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#pragma once
 
#include <memory>
#include <utility>
 
namespace Mantid {
namespace Kernel {
 
template <typename ChainableType> class Chainable {
protected:
  std::unique_ptr<ChainableType> m_successor;
  virtual void checkSuccessor() const {}
 
public:
  template <typename T> Chainable &setSuccessor(T &&successor) {
    m_successor = std::move(successor);
    checkSuccessor();
    return *m_successor;
  }
  bool hasSuccessor() const { return bool(m_successor); }
  virtual ~Chainable() = 0;
};
 
template <typename ChainableType> Chainable<ChainableType>::~Chainable() = default;
 
} // namespace Kernel
} // namespace Mantid