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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Proposal: Constructors, Assignment [LONG]
Date: Fri, 3 Jan 2003 13:29:51 -0600
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Date: 2003-01-03T13:29:51-06:00
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Dmitry A. Kazakov wrote in message ...
>Randy Brukardt wrote:
>
>> No, this is illegal. There can only be one result object declared.
And
>> if there is one, returning anything else is illegal. So the
declaration
>> of Result2 and the return of Result3 are illegal.
>>
>>>I am not sure, but to determine whether there is only one result,
could
>>>be equivalent to halting problem. So some sort of run-time support
will
>>>be well required to determine this. Or will it be classified as one
more
>>>bound error?
>>
>> No, these are all compile-time checks. No run-time penalty at all.
>
>And this?
>
>function Make_Session (Count: Integer) return Internet_Session is
>begin
>   for Index in Integer'Range loop
>      declare
>         Result : return Internet_Session (Index);
>      begin
>         if HALT (x) then
>            return Result;
>         end if;
>      end;
>   end loop;
>end Make_Session;


That would raise Program_Error if Halt was never true, because there was
no return in the function. That of course is the same as the current Ada
rule.

           Randy.