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  1. #include <iostream>
  2.  
  3. template <typename Type, typename ReturnType>
  4. struct mem_fun_ptr_t
  5. {
  6.     typedef ReturnType (Type::*Func)();
  7. 	Func func;
  8. public:
  9. 	mem_fun_ptr_t(Func f):
  10. 		func(f) {}
  11. 	ReturnType operator () (Type *p) { return (p->*func)(); }
  12. 	ReturnType operator () (Type *p) const { return (p->*func)(); }
  13. };
  14.  
  15. template <typename T, typename R>
  16. mem_fun_ptr_t<T, R> mem_fun_ptr(R (T::*Func)() const)
  17. {
  18. 	typedef R (T::*f)();
  19. 	f x = reinterpret_cast<f>(Func);
  20. 	return mem_fun_ptr_t<T, R>(x);
  21. }
  22.  
  23. int main()
  24. {
  25. 	std::string str = "Hello";
  26. 	auto x = mem_fun_ptr(&std::string::length);
  27. 	std::cout << x(&str);
  28.     return 0;
  29. }
Success #stdin #stdout 0s 2984KB
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https://ideone.com/bO0oOt
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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