Getting Error Text from ifstream

Hello group,

coming from C, I'm used to somthing like this when opening a file

const char *foobar = "this.txt";
FILE *f;
f = fopen(foobar, "r");
if (!f) {
  fprintf(stderr, "Couldn't open %s: %s\n", foobar, strerror(errno));
  exit(EXIT_FAILURE);
}

translating that somewhat to C++ yields me with

const char *foobar = "this.txt";
std::ifstream f(foobar);
if (!f) {
  throw GenericException("Couldn't open file.");
}

So I can detect that opening the file wasn't successful, but I don't
know *why* (i.e. permissions, no such file or directory, etc.). My guess
is that strerror and errno still do what I expect them to do, however I
think that would be a very C-way to solve things.

How can I accomplish strerror(errno) on the std::ifstream with C++ means?

Greetings,
Johannes

--
"Viele der Theorien der Mathematiker sind falsch und klar
Gottesl?sterlich. Ich vermute, dass diese falschen Theorien genau
deshalb so geliebt werden." -- Prophet und Vision?r Hans Joss aka
HJP in de.sci.mathematik <4740ad67$0$3811$5402220f@news.sunrise.ch>