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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Callback in Ada
Date: Mon, 3 Jan 2011 15:38:29 -0600
Organization: Jacob Sparre Andersen
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Date: 2011-01-03T15:38:29-06:00
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"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message 
news:wcck4inqpij.fsf@shell01.TheWorld.com...
> "Alex Mentis" <foo@invalid.invalid> writes:
>
>> I was not able to get a short test program using the code above to
>> compile using GNAT GPL 2010 from AdaCore, even when using the Ada 2012
>> switches (-gnat12 and -gnat2012) and pragma (pragma Ada_2012).  The
>> error I get makes it appear that the parser is looking for a "begin"
>> for function Foobar.
>>
>> Using the following worked, though:
>>
>> function Foobar (A : Integer) return Integer is
>> begin
>>    return (if A > 10 then A - 5 else A);
>> end Foobar;
>>
>> What am I missing?
>
> I don't remember when these features were implemented.
> Apparently, the GPL 2010 has 'if' expressions,
> but expression functions are more recent.

That would make sense; I didn't actually write the wording for this proposal 
until mid-October (this was my AI). That was then approved at the late 
October ARG meeting. There are an outline of the feature before that, but no 
details; it would have been tough to implement it usefully without those 
details.

                                   Randy.