Re: Ada platforms and pricing, was: Re: a new language, designed for safety !

["Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr>]

Le Thu, 26 Jun 2014 12:04:47 +0200, G.B.  
<rm-dash-bau-haus@dash.futureapps.de> a écrit:

> On 26.06.14 04:50, Yannick Duchêne (Hibou57) wrote:
>> When I was using C, I used to implement per‑coroutine stack (with limit
>> check!, cheese) and stack‑switching for that purpose, but you can't do
>> it with Ada, as it does not allow this kind of low level hacking.
>
> Given that Ada allows hacking at a level lower than C
> ---address arithmetic is not restricted by the type
> of offsets, for example---what is it that you have been
> doing in C that you think cannot be done in Ada?

You can do low level with Ada (often better than with C), yes, except you  
can't (and that's for good) interfere with the runtime as much easily as  
you can with C. There is no setjump/longjump equivalent in Ada, and  
switching between stacks allocated on the heap would be more hazardous  
with an Ada compiler than with a C compiler.

Anyway, that trick I used and which is not at all recommendable for  
serious works, was surely not portable (I can't remember what the C  
compiler was… DOS or Windows specific).


-- 
“Syntactic sugar causes cancer of the semi-colons.” [1]
“Structured Programming supports the law of the excluded muddle.” [1]
[1]: Epigrams on Programming — Alan J. — P. Yale University