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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct shr {
  5.   template <typename A, typename B>
  6.   constexpr auto operator()(A&& a, B&& b) {
  7.     return std::forward<A>(a) >> std::forward<B>(b);
  8.   }
  9. };
  10.  
  11. struct shl {
  12.   template <typename A, typename B>
  13.   constexpr void operator()(A&& a, B&& b) {
  14.     std::forward<A>(a) << std::forward<B>(b);
  15.   }
  16. };
  17.  
  18. template <typename F, typename A, typename B = A>
  19. auto Apply(A&& a, B&& b) {
  20.   return F{}(std::forward<A>(a), std::forward<B>(b));
  21. }
  22.  
  23.  
  24. int main() {
  25.   // std::cout << (2 >> 1); but uglier
  26.   Apply<shl>(std::cout, Apply<shr>(2, 1));
  27. }
Success #stdin #stdout 0s 3140KB
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https://ideone.com/ItUVKI
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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