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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: What exactly is the licensing situation with GNAT?
Date: Thu, 13 Nov 2014 15:51:54 -0600
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2014-11-13T15:51:54-06:00
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"Georg Bauhaus" <bauhaus@futureapps.invalid> wrote in message 
news:m41pge$si1$1@dont-email.me...
> On 13.11.14 02:49, Randy Brukardt wrote:
>> My recollection is that GWindows depended on Unrestricted_Access (a huge
>> amount of GNAT software does), and that really only works with the GCC
>> runtime model.
>
> I understand ICC's compiler has (something like) Unrestricted_Access?

My recollection was that ICC has it, but it only works in limited 
circumstances -- they couldn't implement the entire thing as supported by 
GNAT.

> (But maybe some uses of 'Unrestricted_Access may be supplanted now
> with plain access subprogram parameters of Ada 2005.)

Right, there is a similarity (not 100%). For Janus/Ada, such parameters 
would be (if I ever got around to implementing them), a record containing 
roughly 20 words of memory to carry the call state. A bit expensive to 
initialize, but it would work (generic formal subprograms have a similar 
implementation, but there the memory is associated with the instance rather 
than the individual actual subprogram parameter).

I recall Adam suggesting that some special sort of named 
access-to-subprogram type be defined with similar characteristics to the 
anonymous access-to-subprogram. Such a thing could be made to work, while 
the bare pointer used for normal access-to-subprogram types would not work. 
But of course it would be susceptible to dangling pointers, and won't 
(usually) be compatible with C.

                                  Randy.


                                  Randy.