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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. template <typename T>
  5. struct helper
  6. {
  7.     void f(T &&)
  8.     {
  9.       std::cout << "&&" << std::endl;
  10.     }
  11.  
  12.     void f(const T&)
  13.     {
  14.       std::cout << "const &" << std::endl;
  15.     }
  16.  
  17. };
  18.  
  19. template <typename T>
  20. void f(T &&t)
  21. {
  22.      helper<typename std::decay<T>::type>().f(std::forward<T>(t));
  23. }
  24.  
  25.  
  26. int main()
  27. {
  28.   int i;
  29.   f(i);
  30.   f(i + 1);
  31. }
Success #stdin #stdout 0s 3140KB
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stdin
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Standard input is empty
stdout
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const &
&&
https://ideone.com/bRErM5
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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