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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. using namespace std;
  5.  
  6. class Test {
  7.   std::function<int(Test*)> func;
  8. public:
  9.   int operator()() {  return func(this); }
  10.  
  11.   int DoIt1() {
  12.     return 1;
  13.   }
  14.  
  15.   int DoIt2() {
  16.     return 2;
  17.   }
  18.  
  19.   void SetIt(int i) {
  20.     if(i == 1) {
  21.       func = &Test::DoIt1;
  22.     } else {
  23.       func = &Test::DoIt2;
  24.     }
  25.   }
  26. };
  27.  
  28. int main()
  29. {
  30.   Test t1;
  31.  
  32.   t1.SetIt(1);
  33.  
  34.   std::cout << t1() << std::endl;
  35.  
  36.   t1.SetIt(2);
  37.  
  38.   std::cout << t1() << std::endl;
  39.  
  40.   return 0;
  41. }
Success #stdin #stdout 0s 2828KB
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https://ideone.com/l88eB
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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