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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_ios_set_rdbuf.htm below:

C++ IOS::set_rdbuf() function

The C++ std::ios::set_rdbuf() function is used to set a new stream buffer for an input/output stream object. It allows redirection of the I/O operations to a different buffer, enabling the custom handling of I/O operations.

Following is the syntax for std::ios::set_rdbuf() function.

void set_rdbuf (streambuf* sb);

• sb − It indicates the pointer to a streambuf object(This shall not be a null pointer).

This function does not return anything

If an exception is thrown, the stream is in a valid state.

Modifies the stream object.

Concurrent access to the same stream object may cause data races.

Let's look at the following example, where we are going to redirect std::cout to std::ostringstream.

#include <iostream>
#include <sstream>
int main()
{
    std::ostringstream x;
    std::streambuf* a = std::cout.rdbuf(x.rdbuf());
    std::cout << "Welcome To, TutorialsPoint." << std::endl;
    std::cout.rdbuf(a);
    std::cout << " " << x.str() << std::endl;
    return 0;
}

Output of the above code is as follows −

Welcome To, TutorialsPoint.

Consider the following example, where we are going to redirect std::cin to a std::istringstream.

#include <iostream>
#include <sstream>
int main()
{
    std::istringstream x("1 2.12 POLO");
    std::streambuf* y = std::cin.rdbuf(x.rdbuf());
    int a;
    double b;
    std::string c;
    std::cin >> a >> b >> c;
    std::cin.rdbuf(y);
    std::cout << " " << a << ", " << b << ", " << c << std::endl;
    return 0;
}

Following is the output of the above code −

1, 2.12, POLO

ios.htm

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