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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: package Ada.Tags
Date: Fri, 08 Jun 2012 11:50:30 +0200
Organization: Ada @ Home
Message-ID: <op.wfkwaguhule2fv@douda-yannick>
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Date: 2012-06-08T11:50:30+02:00
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Le Thu, 07 Jun 2012 23:35:11 +0200, Simon Wright <simon@pushface.org> a =
 =

=C3=A9crit:

> "RasikaSrinivasan@gmail.com" <RasikaSrinivasan@gmail.com> writes:
>
>>    procedure show (event : events_record_type) is
>>       use GNAT.Calendar.Time_IO;
>>    begin
>>       put( ada.Tags.Expanded_Name( event'tag ) );
>>       put( gnat.Calendar.time_io.Image( event.time ,  =

>> gnat.Calendar.Time_IO.ISO_Date & " %T")) ;
>>    end show;
>>
>> gives me a compilation error:
>>
>> "tag" attribute can only be applied to objects of class - wide type.
>>
>> In the above, isnt event an object meeting this criterion?
>>
>> clearly i am missing something. The question is I want to find out th=
e
>> equivalent of RTTI from C++. ie Which one if the derived types is it.=

>
> You can get it to compile by converting the object 'event' of a specif=
ic
> type to the class-wide type:
>
>   Events_Record_Type'Class (Event)'Tag

Forgive me for being pedantic, but it's important to note this is not a =
 =

type conversion, that's a *view conversion*.

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity