DeepCopyPointerByClone.h

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#ifndef DeepCopyPointerByClone_H
#define DeepCopyPointerByClone_H

#include<algorithm>

template <class T>
class DeepCopyPointerByClone {
public:
  
  ~DeepCopyPointerByClone() { delete theData;}
  DeepCopyPointerByClone() : theData(nullptr) {}

  DeepCopyPointerByClone( T* t) : theData(t) {}

  DeepCopyPointerByClone( const DeepCopyPointerByClone& other) {
    if (other.theData) theData = other->clone(); else theData = nullptr;
  }


  DeepCopyPointerByClone& operator=( const DeepCopyPointerByClone& other) {
    if ( theData != other.theData) {
      delete theData;
      if (other.theData) theData = other->clone(); else theData = 0;
    }
    return *this;
  }

  // straight from http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2027.html
  DeepCopyPointerByClone( DeepCopyPointerByClone&& other) : theData(other.theData) {
    other.theData=0;
  }
  DeepCopyPointerByClone& operator=( DeepCopyPointerByClone&& other) {
    std::swap(theData,other.theData);
    return *this;
  }


  T&       operator*()       { return *theData;}
  const T& operator*() const { return *theData;}

  T*       operator->()       { return theData;}
  const T* operator->() const { return theData;}

  operator bool() const { return theData != 0;}

  bool operator==( const T* otherP) const { return theData == otherP;}

private:
  T* theData;
};

#endif // DeepCopyPointerByClone_H