[Bug c++/46806] -O3 implies 0 <= 8 <= 7

[cstankevitz at toyon dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46806

--- Comment #7 from Chris Stankevitz <cstankevitz at toyon dot com> 2010-12-05 
18:11:55 UTC ---

If I understand correctly, you are saying "The following is not a valid way to
test whether a user-supplied int is withing the bounds of an enum:"

  if (
    Eight >= static_cast<int>(eZero) &&
    Eight <= static_cast<int>(eSeven))
  {
    Value = static_cast<TEValue>(Eight);

    std::cerr << "0 <= 8 <= 7 (this is bad)\n";
  }

What is the correct, valid, portable way to test whether a user-supplied int is
in the range of an enum?

Thank you,

Chris