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  1. #include <iostream>
  2. #include <utility>	//std::forward
  3. #include <memory>	//std::shared_ptr
  4. using namespace std;
  5.  
  6. template<class C, class T, class... Args>
  7. struct Proxy
  8. {
  9. 	shared_ptr<C> _objC;
  10. 	typedef T (C::*funcptr_t)(Args...);
  11. 	funcptr_t _fp;
  12.  
  13. 	Proxy(shared_ptr<C> objC, funcptr_t fp): _objC(objC), _fp(fp) {}
  14.  
  15. 	template<class... ActualArgs>
  16. 	T operator()(ActualArgs&&... args)
  17. 	{
  18. 		return ((*_objC).*_fp)(std::forward<ActualArgs>(args)...);
  19. 	}
  20. };
  21.  
  22. template<class C, class T, class... Args>
  23. Proxy<C,T,Args...> operator ->* (shared_ptr<C> c, T (C::*fp)(Args...))
  24. {
  25. 	return Proxy<C,T,Args...>(c, fp);
  26. }
  27.  
  28. struct Clazz
  29. {
  30. 	int v;
  31.  
  32. 	Clazz(int x) : v(x) {}
  33.  
  34. 	int foo(int w) {return v + w;}
  35. 	int bar(int x, int y) {return v * x + y;}
  36. 	void baz(int* p) {*p = v * v;}
  37. };
  38.  
  39. int main(void)
  40. {
  41. 	shared_ptr<Clazz> pObj (new Clazz(42));
  42.  
  43. 	auto fp1 = &Clazz::foo;
  44. 	auto fp2 = &Clazz::bar;
  45. 	auto fp3 = &Clazz::baz;
  46.  
  47. 	int q = 22;
  48. 	int w;
  49. 	int *pw = &w;
  50.  
  51. 	cout << (pObj->*fp1)(58) << endl;
  52. 	cout << (pObj->*fp2)(132, q) << endl;
  53. 	(pObj->*fp3)(pw);
  54. 	cout << w << endl;
  55.  
  56. 	return 0;
  57. }
  58.  
Success #stdin #stdout 0s 3276KB
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https://ideone.com/ZBnLhn
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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