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  1. #include <list>
  2. #include <iostream>
  3. #include <sstream>
  4. class summator{
  5.     std::list<int> vars;
  6. public:
  7.     summator& operator << (int o)
  8.     {
  9.         vars.push_back(o);
  10.         return *this;
  11.     }
  12.     summator& operator << (const char *o)
  13.     {
  14.         vars.push_back(atoi(o));
  15.         return *this;
  16.     }
  17.     summator& calc_internal()
  18.     {
  19.         int sum = 0;
  20.         while(!vars.empty()){
  21.             sum += vars.front();
  22.             vars.pop_front();
  23.         }
  24.         std::cout << "sum = " << sum;
  25.         return *this;
  26.     }
  27.  
  28.     summator& operator << ( summator & (f)( summator & ) ) {
  29.         return f( *this );
  30.     }    
  31. };
  32.  
  33. summator & calc( summator & o )
  34. {
  35. 	return o.calc_internal();
  36. }
  37.  
  38.  
  39. int main(int argc, char* argv[])
  40. {
  41.     summator sum;
  42.     sum << 1 << 2 << "3" << calc;
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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sum = 6
https://ideone.com/aYThBO
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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