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  1. #include <cstdio>    // for printf.
  2.  
  3. struct b
  4. {
  5. 	virtual void f() { std::printf("in b\n"); }
  6. };
  7.  
  8. struct d1 : b
  9. {
  10. 	virtual void f() override { std::printf("in d1\n"); }
  11. };
  12.  
  13. struct d2 : b
  14. {
  15. 	virtual void f() override { std::printf("in d2\n"); }
  16. };
  17.  
  18. struct unko_f final
  19. {
  20. 	b *pb;
  21. 	unko_f(b *pb) : pb(pb) {}
  22. 	void operator=(b *pb) { this->pb = pb; }
  23.  
  24. 	void operator()() { this->pb->f(); }
  25. };
  26.  
  27. struct unko_del final
  28. {
  29. 	b *pb;
  30. 	void (b::*pbf)();
  31.  
  32. 	unko_del(b *pb, void (b::*pbf)()) : pb(pb), pbf(pbf) {}
  33.  
  34. 	void operator()() { ( (this->pb) ->* (this->pbf) ) (); }
  35. };
  36.  
  37. int main()
  38. {
  39. 	d1 i1;
  40. 	unko_f kusof(&i1);
  41. 	kusof();
  42.  
  43. 	d2 i2;
  44. 	kusof = &i2;
  45. 	kusof();
  46.  
  47. 	unko_del del1(&i1, &b::f);
  48. 	del1();
  49.  
  50. 	std::getchar();
  51. }
  52.  
Success #stdin #stdout 0s 2856KB
comments (?)
stdin
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Standard input is empty
stdout
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in d1
in d2
in d1
https://ideone.com/EXYDUk
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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