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Newsgroups: comp.lang.ada
Date: Mon, 23 Nov 2015 06:16:38 -0800 (PST)
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Subject: Re: operation can be dispatching in only one type
From: Serge Robyns <serge.robyns@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:28506
Date: 2015-11-23T06:16:38-08:00
List-Id: <comp.lang.ada>

On Monday, 23 November 2015 14:48:45 UTC+1, Dmitry A. Kazakov  wrote:
> On Mon, 23 Nov 2015 05:05:02 -0800 (PST), Serge Robyns wrote:
>=20
> > On Monday, 23 November 2015 12:29:55 UTC+1, Dmitry A. Kazakov  wrote:
> >> On Mon, 23 Nov 2015 02:23:57 -0800 (PST), Serge Robyns wrote:
> >>=20
> >>> I'm facing an issue with Ada when it comes to use an operation on two
> >>> tagged types.
> >>=20
> >> You can use tagged types, they cannot be dispatching arguments though.=
 That
> >> is a big difference.
> >>=20

> C++ code is broken, always broken, because C++ confuses T and T'Class and
> hence re-dispatches each time and every place (except for ctors). Ada's
> exact equivalent to
>=20
> void account::update_balance (account_balance& ab, money amount)
>=20
> is
>=20
> procedure Update_Balance (X : in out Account;
>     AB : in out Account_Balance'Class, ...)
>=20

This one did the trick.  I do feel very frustrated with regards to the Ada =
idiosyncrasies, if I may say so. Recalls me the "'" notation I had to use w=
hen declaring a part of a constant that was from a parent class.  I got thi=
s trick in this newsgroup too.  Trying to google on Ada "'" is a challenge =
:-P.

I'm wondering the best way to "learn" these without falling asleep while re=
ading for the 10th time basic programming stuff and then missing that one i=
mportant comment in the text.