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  1. #include <iostream>
  2. #include <functional>
  3. #include <vector>
  4.  
  5. bool increase(const std::vector<std::function<std::size_t()>>& v,
  6.               std::vector<std::size_t>& it)
  7. {
  8.     for (std::size_t i = 0, size = it.size(); i != size; ++i) {
  9.         const std::size_t index = size - 1 - i;
  10.         ++it[index];
  11.         if (it[index] > v[index]()) {
  12.             it[index] = 0;
  13.         } else {
  14.             return true;
  15.         }
  16.     }
  17.     return false;
  18. }
  19.  
  20. void do_job(const std::vector<std::size_t>& it)
  21. {
  22.     for (const auto e : it) {
  23.         std::cout << e << " ";
  24.     }
  25.     std::cout << std::endl;
  26. }
  27.  
  28. void iterate(std::vector<std::size_t>& it,
  29.              const std::vector<std::function<std::size_t()>>& v)
  30. {
  31.     do {
  32.         do_job(it);
  33.     } while (increase(v, it));
  34. }
  35.  
  36. int main(int argc, char *argv[])
  37. {
  38.     std::vector<std::size_t> its(3, 0);
  39.     std::vector<std::function<std::size_t()>> bounds = {
  40.         []{ return 2; },
  41.         []{ return 3; },
  42.         [&its]{ return its[0] + its[1]; },
  43.     };
  44.  
  45.     iterate(its, bounds);
  46. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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0 0 0 
0 1 0 
0 1 1 
0 2 0 
0 2 1 
0 2 2 
0 3 0 
0 3 1 
0 3 2 
0 3 3 
1 0 0 
1 0 1 
1 1 0 
1 1 1 
1 1 2 
1 2 0 
1 2 1 
1 2 2 
1 2 3 
1 3 0 
1 3 1 
1 3 2 
1 3 3 
1 3 4 
2 0 0 
2 0 1 
2 0 2 
2 1 0 
2 1 1 
2 1 2 
2 1 3 
2 2 0 
2 2 1 
2 2 2 
2 2 3 
2 2 4 
2 3 0 
2 3 1 
2 3 2 
2 3 3 
2 3 4 
2 3 5
https://ideone.com/fn9nUU
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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