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From: Jacob Sparre Andersen <sparre@nbi.dk>
Newsgroups: comp.lang.ada
Subject: Re: operation can be dispatching in only one type
Date: Sun, 29 Nov 2015 18:59:47 +0100
Organization: JSA Research & Innovation
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Xref: news.eternal-september.org comp.lang.ada:28592
Date: 2015-11-29T18:59:47+01:00
List-Id: <comp.lang.ada>

Dmitry A. Kazakov wrote:

> type T is record
>    X : Integer;
> end record;
>
> The compiler generated setter is something like inventing Ada-like
> notation:
>
>    procedure ".X" (Left : in out T; Right : Integer);
>
> Called as follows:
>
>    Y : T;
> begin
>    Y.X := 10;

Wouldn't it be much easier to add the simple bit of syntactic sugar
saying that given:

   procedure Setter (Object : in out T;
                     Field  : in     U);

For a variable object, V, of (a tagged) type T, and an expression, E, of
type U, the statement:

   V.Setter := E;

is equivalent to the statement:

   V.Setter (E);

(Not because it is shorter - it isn't - but because it nicely mirrors
 matching "getter" functions, and because it makes it clear that the
 procedure call copies a value into an object and modifies it.)

Greetings,

Jacob
-- 
Those who can't laugh at themselves leave the job to others.