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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. class B{};
  6. class C : public B{};
  7.  
  8. template <class T>
  9.  
  10. class A {
  11.   public:
  12.    A (){}
  13.    A(T * p) : ptr(p) {}
  14.    A & operator = ( A /*&*/ & p){
  15.  // 	swap (p.ptr, ptr );  return *this;
  16.  
  17.   A temp;
  18.   // temp=p;
  19.  // temp.ptr=p.ptr;
  20. 	 //return temp;
  21. 	 temp.ptr=p.ptr;
  22. 	 p.ptr=ptr;
  23.  
  24. 	 return p;
  25. }
  26. void pr(){cout<<*ptr<<endl;}
  27.    private:
  28.    T * ptr;
  29.  
  30. };
  31.  
  32. int main(){
  33.    int a=5;
  34.    int *p1=&a;
  35. //A <B> pa2(new C);
  36.    A <int *> pa1 (new int *(p1 ));
  37. // pa1.pr();
  38.    A<int> aob1(p1);
  39.    aob1.pr();
  40.  
  41.    int b=6;
  42.    int *p2=&b;
  43.    A<int> aob2(p2);
  44.    aob2.pr();
  45.  
  46.    aob2=aob1;
  47.    aob2.pr();
  48. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/Gt4Nup
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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