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Memory Leak in Constructor (C++)

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An example showing how to solve the memory leak problem in constructor

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  1. class Number {
  2. public:
  3.    Number() { cout << "number constructor" << endl; }
  4.    ~Number() { cout << "number destructor" << endl; }
  5. };
  6.  
  7. class Photo {
  8. public:
  9.    Photo() { cout << "photo constructor" << endl; }
  10.    ~Photo() { cout << "photo destructor" << endl; }
  11. };
  12.  
  13. class Voice {
  14. public:
  15.    Exp() { throw -1; }
  16.    ~Exp() {}
  17. };
  18.  
  19. class Entry {
  20. public:
  21.   Entry() : m_number(new Number()), 
  22.             m_photo(new Photo()),
  23. 	    m_voice(new Voice())
  24. 	{}
  25.   ~Entry() {}
  26. private:
  27.   const auto_ptr<Number> m_number;
  28.   const auto_ptr<Photo> m_photo;
  29.   const auto_ptr<Voice> m_voice;
  30. };
  31.  
  32.  
  33. try {
  34.    Entry * entry = new Entry();
  35. } catch ( int e ) {
  36.    cout << "m_number and m_photo have been cleaned up" << endl;
  37. }

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