std::basic_ios<CharT,Traits>::rdbuf

Manages the associated stream buffer.

# Declarations

std::basic_streambuf<CharT, Traits>* rdbuf() const;

std::basic_streambuf<CharT, Traits>* rdbuf( std::basic_streambuf<CharT, Traits>* sb );

# Parameters

# Return value

The associated stream buffer, or a null pointer if there was no associated stream buffer.

# Example

#include <iostream>
#include <sstream>
 
int main()
{
    std::ostringstream local;
    auto cout_buff = std::cout.rdbuf(); // save pointer to std::cout buffer
 
    std::cout.rdbuf(local.rdbuf()); // substitute internal std::cout buffer with
                                    // buffer of 'local' object
 
    // now std::cout work with 'local' buffer
    // you don't see this message
    std::cout << "some message";
 
    // go back to old buffer
    std::cout.rdbuf(cout_buff);
 
    // you will see this message
    std::cout << "back to default buffer\n";
 
    // print 'local' content
    std::cout << "local content: " << local.str() << "\n";
}

# See also