fork(1) download
copy 
  1. template <typename Type, typename ReturnType, typename MemFuncType>
  2. struct mem_fun_ptr_t
  3. {
  4.     MemFuncType func;
  5. public:
  6.     mem_fun_ptr_t(MemFuncType f) :
  7.       func(f) {}
  8.     ReturnType operator () (Type *p) const { return (p->*func)(); }
  9. };
  10.  
  11. // non-const version
  12. template <typename T, typename R>
  13. mem_fun_ptr_t<T, R, R (T::*)()> mem_fun_ptr(R (T::*Func)())
  14. {
  15.     return mem_fun_ptr_t<T, R, R (T::*)()>(Func);
  16. }
  17.  
  18. // const version
  19. template <typename T, typename R>
  20. mem_fun_ptr_t<const T, R, R (T::*)() const> mem_fun_ptr(R (T::*Func)() const)
  21. {
  22.     return mem_fun_ptr_t<const T, R, R (T::*)() const>(Func);
  23. }
  24.  
  25. #include <iostream>
  26. #include <string>
  27.  
  28. int main()
  29. {
  30.     std::string str = "Hello";
  31.     auto x = mem_fun_ptr(&std::string::length);
  32.     std::cout << x(&str) << std::endl;
  33.     const std::string const_str = str + ", world!";
  34.     std::cout << x(&const_str) << std::endl;
  35.     return 0;
  36. }
  37.  
Success #stdin #stdout 0s 2984KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
5
13
https://ideone.com/UyZV5K
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!