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C++ stringstream::operator=() function

The C++ std::stringstream::operator=() function is a assignment operator that allows to assign the contents one stringstream object to another. This operator copies the state of one stringstream to another, including its buffer content, error state and formatting settings.

This function has 2 polymorphic variants: with using the copy assignment operator and move assignment operator (you can find the syntaxes of all the variants below).

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

stringstream& operator= (const stringstream&) = delete;
or
stringstream& operator= (stringstream&& rhs);

• rhs − It indicates the another stream object.

This function returns the *this.

This function never throws exceptions.

Modifies both stream objects (*this and rhs).

In the following example, we are going to use the basic usage of the copy assignment operator.

#include <iostream>
#include <sstream>
int main()
{
    std::stringstream a;
    a << "Tutorialspoint";
    std::stringstream b;
    b.str(a.str());
    std::cout << b.str() << std::endl;
    return 0;
}

Output of the above code is as follows −

Tutorialspoint

Consider the following example, where we are going to reuse the stream with new assignment.

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

Following is the output of the above code −

b: Hello
a: Namaste

istream.htm

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