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C++ stringstream::swap() function

The C++ std::stringstream::swap() function is used to exchange the content of two stringstream objects along with their internal states including their buffer contents and state flags. By invoking this function, we can transfer the data between two streams without the need for copying or re-initializing.

Following is the syntax for std::stringstream::swap() function.

void swap (stringstream& x);

• x − It indicates the another stringstream object.

This function does not return anything.

This function never throws exceptions.

Modifies both stream objects (*this and x).

In the following example, we are going to consider the basic usage of the swap() function.

#include <iostream>
#include <sstream>
int main()
{
    std::stringstream a, b;
    a << "Namaste";
    b << "Vanakam";
    a.swap(b);
    std::cout << "After swapping :" << std::endl;
    std::cout << "a : " << a.str() << std::endl;
    std::cout << "b : " << b.str() << std::endl;
    return 0;
}

Output of the above code is as follows −

After swapping :
a : Vanakam
b : Namaste

Consider the following example, where we are going to swap with empty stream.

#include <iostream>
#include <sstream>
int main()
{
    std::stringstream x, y;
    x << "TutorialsPoint";
    x.swap(y);
    std::cout << "After swapping :" << std::endl;
    std::cout << "x : " << x.str() << std::endl;
    std::cout << "y : " << y.str() << std::endl;
    return 0;
}

Following is the output of the above code −

After swapping :
x: 
y: TutorialsPoint

Let's look at the following example, where we are going to use the swap() function with identical streams.

#include <iostream>
#include <sstream>
int main()
{
    std::stringstream x;
    std::stringstream y;
    x << "Hi";
    y << "Hi";
    x.swap(y);
    std::cout << "After swapping :" << std::endl;
    std::cout << "x : " << x.str() << std::endl;
    std::cout << "y : " << y.str() << std::endl;
    return 0;
}

If we run the above code it will generate the following output −

After swapping :
x : Hi
y : Hi

istream.htm

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