Redirect cin to a string

Question

I want to have cin read input from a string.

Is there a way to do this?

Something like this:

const char * s = "123 ab";
cin.readFrom(s); // <---- I want something like this

int i;
cin>>i;

cout<<i; //123

Answer 1

Like this:

#include <sstream>
#include <iostream>

std::istringstream stream("Some string 123");
streambuf* cin_backup = std::cin.rdbuf(stream.rdbuf());

You might want to back up the original rdbuf of std::cin, if you want to use it again.