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  1. #define GENERATOR(name) \
  2. struct name \
  3. { \
  4.     template<typename F> \
  5.     void operator()(F yield) \
  6. /**/
  7. #define _ };
  8.  
  9. template<typename Gen>
  10. struct Adaptor
  11. {
  12.     Gen f;
  13.     template<typename C>
  14.     void operator*(C cont)
  15.     {
  16.         f(cont);
  17.     }
  18. };
  19.  
  20. template<typename Gen>
  21. Adaptor<Gen> make_adaptor(Gen gen)
  22. {
  23.     return {gen};
  24. }
  25.  
  26. #define FOREACH(arg, gen) make_adaptor(gen) * [&](arg)
  27.  
  28. /******************************************************/
  29.  
  30. #include <iostream>
  31. using namespace std;
  32.  
  33. GENERATOR(integers)
  34. {
  35.     yield(1);
  36.     yield(2);
  37.     yield(4);
  38.     yield(8);
  39.     yield(16777216);
  40. }_
  41.  
  42. int main()
  43. {
  44.     FOREACH(int i, integers())
  45.     {
  46.         cout << i << endl;
  47.     };
  48. }
Success #stdin #stdout 0s 3340KB
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1
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16777216
https://ideone.com/V5zy4D
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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