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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class B;
  5. class A
  6. {
  7.     public:
  8.         A(int ax):x(ax) {}
  9.         A* Clone() const 
  10.         {
  11.             return new A(x);
  12.         } 
  13.         /*
  14.         B operator + (A const &v2) const
  15.         {
  16.             A *pv=v2.Clone();
  17.             pv->x+=x;
  18.             return B(pv);
  19.         }
  20.         */
  21.         friend ostream& operator << (ostream &os, A const &v); /*
  22.         {
  23.             os << v.x;
  24.             return os; 
  25.         }*/
  26.     protected:
  27.         int x;
  28. };
  29.  
  30. ostream& operator << (ostream &os, A const &v)
  31. {
  32.     os << v.x;
  33.     return os; 
  34. }
  35.  
  36.  
  37. class B
  38. {
  39.     public:
  40.         B (A *p);
  41.         ~B();
  42.         operator A const () const;
  43.         operator A ();
  44.     private:
  45.         A *y;
  46. };
  47.  
  48.  
  49. B::B (A *p):y(p) {}
  50. B::~B() {delete y;} 
  51. B::operator A const () const {return *y;}
  52. B::operator A () {return *y;}
  53.  
  54. int main()
  55. {
  56.     A v(4),v1(5);
  57.     B b(&v);
  58.     cout << b;
  59. }
  60.  
Runtime error #stdin #stdout 0s 3412KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/SV56y2
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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