(C++) std::iter_swap

std::iter_swap is an STL function to swap the data two iterators point to.


#include <cassert>

#include <vector>



int main()

{

  //Create a std::vector

  std::vector<int> v;

  v.push_back(1);

  v.push_back(2);



  //How are these ints stored?

  assert(v[0]==1);

  assert(v[1]==2);



  //Create two iterators

  std::vector<int>::iterator i = v.begin();

  std::vector<int>::iterator j = v.end() - 1;



  //What are the iterators pointing to?

  assert(*i == 1);

  assert(*j == 2);



  //Swap the data the iterators are pointing to

  std::iter_swap(i,j);



  //What are the iterators pointing to now?

  assert(*i == 2);

  assert(*j == 1);



  //How are these ints stored now?

  assert(v[0]==2);

  assert(v[1]==1);

}

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