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  1. #include <list>
  2. #include <cassert>
  3.  
  4. template <typename It>
  5.    It safe_next(It it, std::size_t steps, It end)
  6. {
  7.     while (it!=end && steps--)
  8.         it++;
  9.  
  10.     return it;
  11. }
  12.  
  13. int main()
  14. {
  15.     std::list<int> l { 1,2,3,4,5,6,7,8 };
  16.     auto it = begin(l);
  17.  
  18.     assert(safe_next(it, 3, end(l)) == std::next(it, 3));
  19.     assert(safe_next(it, 30, end(l)) == end(l));
  20.     assert(next(it, std::min(30, std::distance(it, end(l)))) == end(l));
  21. }
  22.  
  23.  
Success #stdin #stdout 0s 2980KB
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stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/7DYSSn
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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