std::stringstream sourcePlayers(
        "C d 4 3 3 NAME OF DUDE1\n"
        "C f 7 1 2 NAME OF OTHER DUDE\n"
        "C d 3 6 5 SOME OTHER DUDE\n"
       );
This will load those dudes in like your opening a file, You call the thing now with

Where source players is, would be the istream it's taking, sourcePlayers will be the stream your sending it, you can rename source players to anything you like.
functionYouAreCalling(parameter1, sourcePlayers);