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C++ Algorithm Library - iter_swap() Function

The C++ function std::algorithm::iter_swap() exchange values of objects pointed by two iterators. It uses function swap (unqualified) to exchange the elements.

Following is the declaration for std::algorithm::iter_swap() function form std::algorithm header.

template <class ForwardIterator1, class ForwardIterator2>
void iter_swap (ForwardIterator1 a, ForwardIterator2 b);

• a − First forward iterator object.

• b − Second forward iterator object.

None

Throws exception if swap function throws an exception.

Please note that invalid parameters cause undefined behavior.

Constant.

The following example shows the usage of std::algorithm::iter_swap() function.

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main(void) {
   vector<int> v1 = {1, 2, 3, 4, 5};
   vector<int> v2 = {10, 20, 30, 40, 50};

   iter_swap(v1.begin(), v2.begin());
   iter_swap(v1.begin() + 1, v2.begin() + 2);

   cout << "Vector v2 contains following elements" << endl;

   for (auto it = v2.begin(); it != v2.end(); ++it)
      cout << *it << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Vector v2 contains following elements
1
20
2
40
50

algorithm.htm

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