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  1. #include <iostream>
  2. #include <string>
  3.  
  4. template <typename Type, typename ReturnType>
  5. struct mem_fun_ptr_t
  6. {
  7.     typedef ReturnType (Type::*Func)();
  8.     Func func;
  9. public:
  10.     mem_fun_ptr_t(Func f):
  11.         func(f) {}
  12.     ReturnType operator () (Type *p) { return (p->*func)(); }
  13.     ReturnType operator () (Type *p) const { return (p->*func)(); }
  14. };
  15.  
  16. template <typename T, typename R>
  17. mem_fun_ptr_t<T, R> mem_fun_ptr(R (T::*Func)())
  18. {
  19.     return mem_fun_ptr_t<T, R>(Func);
  20. }
  21.  
  22. template <typename T, typename R>
  23. mem_fun_ptr_t<const T, R> mem_fun_ptr(R (T::*Func)() const)
  24. {
  25.     return mem_fun_ptr_t<const T, R>(Func);
  26. }
  27.  
  28. int main()
  29. {
  30.     std::string str = "Hello";
  31.     auto str_len = mem_fun_ptr(&std::string::length);
  32.     std::cout << str_len(&str);
  33.     auto str_clear = mem_fun_ptr(&std::string::clear);
  34.     str_clear(&str);
  35.     std::cout << std::endl << str.empty();
  36.     return 0;
  37. }
Success #stdin #stdout 0s 2984KB
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https://ideone.com/S15nHF
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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