CloningPtr.h

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#ifndef DataFormats_Common_CloningPtr_h
#define DataFormats_Common_CloningPtr_h
// -*- C++ -*-
//
// Package:     Common
// Class  :     CloningPtr
// 
//
// Original Author:  Chris Jones
//         Created:  Mon Apr  3 16:43:29 EDT 2006
//

// system include files
#include <algorithm>
#include <memory>

// user include files
#include "DataFormats/Common/interface/ClonePolicy.h"

// forward declarations
namespace edm {
  template< class T, class P = ClonePolicy<T> >
  class CloningPtr {
public:
    CloningPtr(): ptr_(nullptr) {}
    CloningPtr(const T& iPtr) : ptr_(P::clone(iPtr)) {}
    CloningPtr(std::unique_ptr<T> iPtr) : ptr_(iPtr.release()) {}
    CloningPtr(const CloningPtr<T,P>& iPtr) : ptr_(P::clone(*(iPtr.ptr_))) {}
    
    CloningPtr<T,P>& operator=(const CloningPtr<T,P>& iRHS) {
      CloningPtr<T,P> temp(iRHS);
      swap(temp);
      return *this;
    }
    
    void swap(CloningPtr<T,P>& iPtr) {
      std::swap(ptr_, iPtr.ptr_);
    }
    
    ~CloningPtr() { delete ptr_;}
    
    // ---------- const member functions ---------------------
    T& operator*() { return *ptr_; }
    
    T* operator->() { return ptr_; }
    
    T* get() { return ptr_; }
    
private:
    T* ptr_;
  };

  // Free swap function
  template <class T, class P>
  inline
  void
  swap(CloningPtr<T,P>& a, CloningPtr<T,P>& b) 
  {
    a.swap(b);
  }
}
#endif