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  1. #include <cstdio>
  2. #include <memory>
  3. using namespace std;
  4.  
  5. class A1 {
  6.     public:
  7.     A1() { printf("A1\n"); }
  8.     virtual ~A1() { printf("~A1\n"); }
  9.  
  10.     virtual void p() = 0;
  11. };
  12.  
  13. class B1 : public A1 {
  14.     public:
  15.     void p() { printf("1\n"); }
  16. };
  17.  
  18. class B2 : public A1 {
  19.     public:
  20.     void p() { printf("2\n"); }
  21. };
  22.  
  23. class B3 : public A1 {
  24.     public:
  25.     void p() { printf("3\n"); }
  26. };
  27.  
  28. int main() {
  29.     shared_ptr<A1> pointer(new B1);
  30.     pointer->p();
  31.  
  32.     pointer.reset(new B2);
  33.     pointer->p();
  34.  
  35.     pointer.reset(new B3);
  36.     (*pointer).p();
  37.  
  38.     return 0;
  39. }
Success #stdin #stdout 0s 2988KB
comments (?)
stdin
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Standard input is empty
stdout
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A1
1
A1
~A1
2
A1
~A1
3
~A1
https://ideone.com/2QFR80
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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