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  1. #include <iostream>
  2. #include <utility>
  3.  
  4.     template<typename LHS> struct at_lhs_t { LHS lhs; at_lhs_t(at_lhs_t const&)=delete; at_lhs_t(LHS&& l):lhs(std::forward<LHS>(l)){}; };
  5.     static struct at_t {} at;
  6.     template<typename LHS>
  7.     at_lhs_t<LHS> operator%( LHS&& lhs, at_t ) { return {std::forward<LHS>(lhs)}; }
  8.     template<typename LHS, typename RHS>
  9.     auto operator%( at_lhs_t<LHS>&& lhs, RHS&& rhs )
  10.     ->decltype( (std::forward<LHS>(lhs.lhs))->operator[](std::forward<RHS>(rhs)) )
  11.      { return ( (std::forward<LHS>(lhs.lhs))->operator[](std::forward<RHS>(rhs)) ); }
  12.  
  13.     class MyClass
  14.     {
  15.     public:
  16.         void operator[](int n)
  17.         {
  18.             std::cout<<"In []";
  19.         }
  20.     };
  21.     int main()
  22.     {
  23.         MyClass *a=new MyClass;
  24.         a %at% 2;
  25.     }
Success #stdin #stdout 0s 3472KB
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Standard input is empty
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In []
https://ideone.com/4puOAq
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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