Is it valid to throw in a catch block (C++)?

Question

I haven't done C++ in a while and my memory is fuzzy, nor have I found a definitive answer so far searching. I'm not talking about rethrowing the caught exception, but rather catching one exception and throwing a different type, such as:

std::unordered_map<int, int> foo;
...
int getFoo(int id)
{
  try {
    return foo.at(id);
  }
  catch (std::out_of_range& e)
  {
    throw MyMoreDescriptiveExceptionType();
  }
}

Answer 1

Yes. (have to fill to reach 30 characters)

Answer 2

Yes. Among other things, it allows you to log and re-throw exceptions properly.

Just be careful to re-throw properly. If done incorrectly, you could lose the original stack trace which makes the actual problem much harder to track down.