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Groups > comp.lang.c > #18930

Re: reusing identifier in two enums

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Am 03/21/2012 03:45 AM, schrieb Joe keane:
> In article <93a85ab3-ecbf-4aa0-8fbd-6699e810b9e9@v2g2000vbx.googlegroups.com>,
> ImpalerCore  <jadill33@gmail.com> wrote:
>> I have two related but separate enumerations where I'd like to use the
>> same identifier to represent an invalid type.
> 
> This is basically subtypes which define the valid values, and a
> supertype where one can only set an invalid value, and test for that.

subtype ?

> class basic_type
> {
>     static const int invalid = -1;
>     int x;
> 
>     bool is_valid() const { return x >= 0; }
>     void set_invalid() { x = invalid; }
> };
> 
> class color_type : basic_type
> {
>     enum color { red = 1, orange = 13, yellow = 3, ... };
> 
>     bool is_red() const { return x == red; }
>     void set_red() { x = red; }
>     ...
> };

wrong language? C doesn't know anything of "class", inheritance and
things like that

> Decrement the language:

You mean C-- ?

Jens

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reusing identifier in two enums ImpalerCore <jadill33@gmail.com> - 2012-03-19 08:04 -0700
  Re: reusing identifier in two enums "Morris Keesan" <mkeesan@post.harvard.edu> - 2012-03-19 12:19 -0400
    Re: reusing identifier in two enums ImpalerCore <jadill33@gmail.com> - 2012-03-19 10:43 -0700
  Re: reusing identifier in two enums Keith Thompson <kst-u@mib.org> - 2012-03-19 10:43 -0700
    Re: reusing identifier in two enums ImpalerCore <jadill33@gmail.com> - 2012-03-19 11:42 -0700
  Re: reusing identifier in two enums jgk@panix.com (Joe keane) - 2012-03-21 02:45 +0000
    Re: reusing identifier in two enums Jens Gustedt <jens.gustedt@loria.fr> - 2012-03-21 17:04 +0100

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