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  1. template<typename... args>
  2. struct stream_op
  3. {
  4.     unsigned int size() { return sizeof...(args); }
  5. };
  6.  
  7. template<typename... A, typename B>
  8. stream_op<A..., B> operator<<(stream_op<A...> a, B b)
  9. {
  10.     // Do stuff
  11.     return stream_op<A..., B>();
  12. }
  13.  
  14. stream_op<> empty;
  15.  
  16. #include <iostream>
  17. int main()
  18. {
  19.     std::cout << "length = " << (empty << 1 << 2).size() << "\n";
  20.     std::cout << "length = " << (empty << 1 << 2 << 3).size() << "\n";
  21.     std::cout << "length = " << (empty << 1 << 2 << 3 << 4).size() << "\n";
  22. }
  23.  
Success #stdin #stdout 0s 2852KB
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stdin
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Standard input is empty
stdout
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length = 2
length = 3
length = 4
https://ideone.com/K7NYrh
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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