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  1. #include <iostream>
  2.  
  3. template <class T>
  4. struct sum 
  5. {
  6. 	T val;
  7. 	sum(T a) : val(a) {}
  8.  
  9. 	template <class T2>
  10. 	auto operator()(T2 a) -> sum<decltype(val + a)> { return val + a; }
  11.  
  12. 	//sum operator()(T a) { return val + a; }
  13.  
  14. 	operator T() { return val; }
  15. };
  16.  
  17. template <class T>
  18. sum<T> f(T a)
  19. {
  20. 	return a;
  21. }
  22.  
  23. int main()
  24. {
  25. 	std::cout << f(1)(2.5)(3.1f)(4) << std::endl;
  26. }
Success #stdin #stdout 0s 16064KB
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10.6
https://ideone.com/eXAB6J
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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