Re: misc comments

From	"Benjamin David Lunt" <zfysz@fysnet.net>
Newsgroups	alt.os.development
Subject	Re: misc comments
Date	2016-03-03 12:08 -0700
Organization	Aioe.org NNTP Server
Message-ID	<nba24v$1rap$2@gioia.aioe.org> (permalink)
References	<nb5bmn$5aa$2@gioia.aioe.org> <20160302185854.0351de69@_>

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"Rod Pemberton" <NoHaveNotOne@bcczxcfre.cmm> wrote in message 
news:20160302185854.0351de69@_...
> On Tue, 1 Mar 2016 17:21:22 -0700
> "Benjamin David Lunt" <zfysz@fysnet.net> wrote:
>
>> The text of the book, the body, or heart of the book is *not*
>> coming along so well.  It is hard to explain the details
>> so that a beginner to programming can somewhat understand
>> what is going on.  It's a project where you really need
>> some programming background to understand the subject.
>> I have yet to find that knowledge level where the reader
>> should be.  If I assume the reader is fluent in C's Unions
>> and Structures, the beginner will be lost.  If I don't,
>> a lot of the text is describing the C language.  I find
>> myself adding text and removing it, numerous times trying
>> to find that line.  Oh well, soon.  :-)
>
> Well, they should understand structures if they've had
> any high-level language.  If they don't understand
> unions, they might understand overlays, which is
> similar to using a pointer to a typedef'd struct in
> C, setting a pointer to the typedef, then accessing
> items via the typedef's struct elements.  A "union"
> in an overlay setting would be setting multiple overlays
> of different objects to the same region.

My code uses a lot of unions, or as you comment, a better
description would be overlays.

Every item in the GUI is an overlay, so that a single
OBJECT * pointer can be used for any item.  It is then
up to the callee to "extract" the data from the overlay.

My difficulty stands where a beginning reader might not
understand that a "Window object" and a "Text object" can
have the exact same overlay.

Ben

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misc comments "Benjamin David Lunt" <zfysz@fysnet.net> - 2016-03-01 17:21 -0700
  Re: misc comments "Alexei A. Frounze" <alexfrunews@gmail.com> - 2016-03-01 21:52 -0800
    Re: misc comments "Benjamin David Lunt" <zfysz@fysnet.net> - 2016-03-02 10:28 -0700
      Re: misc comments Rod Pemberton <NoHaveNotOne@bcczxcfre.cmm> - 2016-03-02 18:58 -0500
        Re: misc comments "Benjamin David Lunt" <zfysz@fysnet.net> - 2016-03-03 12:04 -0700
      Re: misc comments "Alexei A. Frounze" <alexfrunews@gmail.com> - 2016-03-02 23:41 -0800
  Re: misc comments Rod Pemberton <NoHaveNotOne@bcczxcfre.cmm> - 2016-03-02 18:58 -0500
    Re: misc comments "Benjamin David Lunt" <zfysz@fysnet.net> - 2016-03-03 12:08 -0700

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