Input file stream to stdin

[Skatanic]

Is there a way to set an input file stream:
ifstream in;
so that it will read not from a file, but from stdin instead? What I am trying to do is make it so the input can come from either stdin or from a file. If there is no file specified it will be from stdin. If there is a file, it will read from the file, then at the end switch to reading from stdin. I would like to make it so that I can use ifstream and not FILE*. I can do it using the file pointers, but I already set up the WHOLE program using streams and I don't want to switch them to fscanf.

Thanks,
Skatanic

 

[Skatanic]

Another one of those times where you figure it out before you get a reply. So in case anyone was wondering here is what I did...

istream *input;
ifstream in;

// ...

if (!in) {
input = &cin;
} else {
input = new ifstream(in);
}

Then whenever in is empty, just delete input and do
input = &cin;
and it will go back to stdin;

In order to input using that istream, do this:
*input >> blah;

That's it...
-Skatanic