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  1. #include <iostream>
  2.  
  3. template <typename ResultInt>
  4. class CalcFor
  5. {
  6. public:
  7.     CalcFor() : total_(0) { }
  8.  
  9.     template <typename T>
  10.     void next() 
  11.     {
  12.         total_ += sizeof(T);
  13.     }
  14.  
  15.     ResultInt total() const { return total_; }
  16.  
  17. private:
  18.     ResultInt total_;
  19. };
  20.  
  21. template <typename ResultInt, typename... Ts>
  22. class Calc
  23. {
  24. public:
  25.     ResultInt total() const
  26.     {
  27.         CalcFor<ResultInt> e;
  28.         int dummy[] = { (e.template next<Ts>(), 0)... };
  29.         (void)dummy;
  30.         return e.total();
  31.     }
  32. };
  33.  
  34. int main(const int /* argc */, const char* const* /* argv */ )
  35. {
  36.     Calc<size_t, int, char> c;
  37.     std::cout << c.total() << '\n';
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 16064KB
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https://ideone.com/BGXBds
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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