ConstRespectingPtr.h

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#ifndef FWCore_Utilities_ConstRespectingPtr_h
#define FWCore_Utilities_ConstRespectingPtr_h

// Package:     FWCore/Utilities
// Class  :     ConstRespectingPtr
//
// Original Author:  W. David Dagenhart
//         Created:  20 March 2014

#include <memory>

#include "FWCore/Utilities/interface/propagate_const.h"

namespace edm {

  template <typename T>
  class ConstRespectingPtr {

  public:

    ConstRespectingPtr();
    explicit ConstRespectingPtr(T*);
    ~ConstRespectingPtr();

    T const* operator->() const { return m_data; }
    T const& operator*() const { return *m_data; }
    T const* get() const { return m_data; }

    T* operator->() { return m_data; }
    T& operator*() { return *m_data; }
    T* get() { return m_data; }

    bool isSet() const;

    void set(std::unique_ptr<T> iNewValue);

    T* release();
    void reset();

  private:

    ConstRespectingPtr(ConstRespectingPtr<T> const&) = delete;
    ConstRespectingPtr& operator=(ConstRespectingPtr<T> const&) = delete;

    edm::propagate_const<T*> m_data;
  };

  template<typename T>
  ConstRespectingPtr<T>::ConstRespectingPtr() : m_data(nullptr) {}

  template<typename T>
  ConstRespectingPtr<T>::ConstRespectingPtr(T* v) : m_data(v) {}

  template<typename T>
  ConstRespectingPtr<T>::~ConstRespectingPtr() {
    delete m_data.get();
  }

  template<typename T>
  bool ConstRespectingPtr<T>::isSet() const { return nullptr != m_data; }

  template<typename T>
  void ConstRespectingPtr<T>::set(std::unique_ptr<T> iNewValue) {
    delete m_data;
    m_data = iNewValue.release();
  }

  template<typename T>
  T* ConstRespectingPtr<T>::release() {
    T* tmp = m_data;
    m_data = nullptr;
    return tmp;
  }

  template<typename T>
  void ConstRespectingPtr<T>::reset() {
    delete m_data;
    m_data = nullptr;
  }
}
#endif