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  1. #include <iostream>
  2. #include <string>
  3.  
  4. struct counter {
  5.     size_t ints, doubles, strings, others;  
  6.  
  7.     counter(): ints(0), doubles(0), strings(0), others(0) {}
  8.  
  9.     counter & operator , (int) { ++ints; return *this; }
  10.     counter & operator , (double) { ++doubles; return *this; }
  11.  
  12.     counter & operator , (char const *) { ++strings; return *this; }
  13.     counter & operator , (std::string const &) { ++strings; return *this; }
  14.  
  15.     template <class T>
  16.     counter & operator , (T const &) { ++others; return *this; }
  17.  
  18.     template <class T>
  19.     counter & operator += (T const & v) { return this->operator , (v); }
  20.  
  21.     friend std::ostream & operator << (std::ostream & o, counter const & c)
  22.     {
  23.         return o << "counter{ ints:" << c.ints << ", doubles:" << c.doubles << ", strings:" << c.strings 
  24.             << ", others:" << c.others << " }";
  25.     }
  26. };
  27.  
  28. int main()
  29. {
  30.     counter c;
  31.     c += 10, 10., 200, "hello!", true, 5, 'x';
  32.     std::cout << c << std::endl;
  33.  
  34.     return 0;
  35. }
Success #stdin #stdout 0s 2884KB
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Standard input is empty
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counter{ ints:3, doubles:1, strings:1, others:2 }
https://ideone.com/OCAkDX
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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