Re: [c++] switch ( enum ) vs. default statment.

["David Nicol" <davidnicol at gmail dot com>]

On 1/23/07, Paweł Sikora <pluto@agmk.net> wrote:
> typedef enum { X, Y } E;
> int f( E e )
> {
>         switch ( e )
>         {
>                 case X: return -1;
>                 case Y: return +1;
>         }

+         throw runtime_error("invalid value got shoehorned into E enum")

> }
>
> In this example g++ produces a warning:
>
> e.cpp: In function 'int f(E)':
> e.cpp:9: warning: control reaches end of non-void function
>
> Adding `default' statemnet to `switch' removes the warning but
> in C++ out-of-range values in enums are undefined.

nevertheless, that integer type might get its bits twiddled somehow.