std::distance is an STL algorithm to determine the distance (in number of elements) between two iterators.


#include <cassert>

#include <vector>



int main()

{

  std::vector<int> v;

  assert(std::distance(v.begin(),v.end())==0);

  v.push_back(0);

  v.push_back(1);

  v.push_back(2);

  v.push_back(3);

  v.push_back(4);

  assert(std::distance(v.begin(),v.end())==5);

}

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(C++) std::distance