Switch question

[Gabriel Dos Reis]

I  wrote:

| > Actually, even though the definitions are permitted, the overloads are
| > not.

I was wrong.  17.3.2.1.2/1 says

  Several types defined in clause 27 are bitmask types.  Each bitmask
  type can be implemented as an enumerated type that overloads
  certain operators, as an integer type, or as a bitset (23.3.5). 

Ryszard Kabatek <Ryszard.Kabatek@softax.pl> wrote:

| I hope it will be fixed in the gcc-3.0 release.

Actually, as it turns out that isn't a compiler bug nor a library bug.
It is a quality of implementation issue. 

| In other case one will have to write something like that:
| 
| #include <iostream>
|  
| int f(std::ios_base::openmode mode)
| {
|   switch(mode & ~std::ios_base::ate) {
|     case static_cast<int>(std::ios_base::out) |
|          static_cast<int>(std::ios_base::trunc):

This is not portable either.

I think you're left with a sequence of if/else if.

-- Gaby
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