=====swap=====
Syntax:

<code>
    #include <vector>
    void swap( vector& from );
</code>

The swap() function exchanges the elements of the current vector with those of
from. This function operates in [[/complexity|constant time]].

For example, the following code uses the swap() function to exchange the
contents of two vectors:

<code>
    vector<string> v1;
    v1.push_back("I'm in v1!");

    vector<string> v2;
    v2.push_back("And I'm in v2!");

    v1.swap(v2);

    cout << "The first element in v1 is " << v1.front() << endl;
    cout << "The first element in v2 is " << v2.front() << endl;
</code>

The above code displays:

<code terminal>
    The first element in v1 is And I'm in v2!
    The first element in v2 is I'm in v1!
</code>

Related Topics: [[vector_operators|= operator]]