Developer Command Prompt for VS 2019
cl basic_ios_rdbuf.cpp /EHsc
MSDN Source Code
#include <ios>#include <iostream>#include <fstream>int main( )
{using namespace std;
ofstream file( "rdbuf.txt" );
streambuf *x = cout.rdbuf( file.rdbuf( ) );
cout << "test" << endl; // Goes to file
cout.rdbuf(x);
cout << "test2" << endl; //normal
}