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  1. #include <stdio.h>
  2.  
  3. class A
  4. {
  5. public:
  6.     virtual ~A(){}
  7. };
  8.  
  9. class B : public A
  10. {
  11. public:
  12.     void Func(void){ printf( "B Func();\n" ); }
  13. };
  14.  
  15. typedef void(A::*A_Callback)(void);
  16.  
  17. class C
  18. {
  19. public:
  20.     void SetCallback( A* pA, A_Callback callback )
  21.     {
  22.         m_pA = pA;
  23.         m_Callback = callback;
  24.     }
  25.     void Do( void )
  26.     {
  27.         (m_pA->*m_Callback)();
  28.     }
  29.     A*         m_pA;
  30.     A_Callback m_Callback;
  31. };
  32.  
  33. int main( void )
  34. {
  35.     B b;
  36.     C c;
  37.     /* error
  38.     c.SetCallback( &b, &B::Func );
  39.     */
  40.     c.SetCallback( &b, static_cast<A_Callback>(&B::Func) );
  41.     c.Do();
  42.     return 0;
  43. }
Success #stdin #stdout 0.02s 2680KB
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B Func();
https://ideone.com/dm8iQ9
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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