Re: [Gm2] extension request

[Andreas Fischlin]

No, this does not make sense, since it would complicate the implementation of a 
compiler considerably. Modula-2 assumes that ORD(MIN(EnumType)) = 0 and that 
ORD(INC(et)) - ORD(et) = 1 when variable et is of type EnumType etc. Moreover, 
CASE statements can become very difficult to implement either. I suggest you 
use constants for your purpose.

Regards,
Andreas

ETH Zurich
Prof. Dr. Andreas Fischlin
Systems Ecology - Institute of Integrative Biology
CHN E 21.1
Universitaetstrasse 16
8092 Zurich
SWITZERLAND

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________________________________________________________________________



On 27/Sep/2010, at 00:55 , Martin Kalbfuss wrote:

> Hi.
> 
> While working on my SDL wrapper, I had a problem with enumerations and
> sets.
> 
> The save enumeration type of modula is not as flexible as the C/C++
> enumeration type. You cannot explicitly set numerical values for the
> flags. That's no problem as long as you work with modula only. But if
> you have a C/C++ enumeration like
> 
> typedef enum
> {
>       VALUE_1 = 0,
>       VALUE_2 = 60;
> 
> }AN_ENUM;
> 
> You get in trouble. You have to use plain numbers in your definition
> modules and loose the savety of the Modula types and have a C-Like
> interface. Not nice. Would it be possible to allow to set the values for
> modula enumerations explicitly?
> 
> Like
> 
> TYPE Key = (..., K_AT = 64, K_LEFTBRACKET = 91, ...);
> 
> Thanks,
> 
> Martin
> 
> 
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