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  1. #include <iostream>
  2.  
  3. template<class T>
  4. struct larrow {
  5.     larrow(T* a_) : a(a_) { }
  6.     T* a;
  7. };
  8.  
  9. template <class T, class R>
  10. R operator<(R (T::* f)(), larrow<T> it) {
  11.     return (it.a->*f)();
  12. }
  13.  
  14. template<class T>
  15. larrow<T> operator-(T& a) {
  16.     return larrow<T>(&a);
  17. }
  18.  
  19. struct C {
  20.     void f() { std::cout << "foo\n"; }    
  21. };
  22.  
  23. int main() {
  24.     C x;
  25.     (&C::f)<-x;
  26.     int i = 5;
  27.     std::cout << -i << std::endl;
  28. }
Success #stdin #stdout 0s 3412KB
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stdin
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Standard input is empty
stdout
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foo
-5
https://ideone.com/mK8SA2
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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