Perth ADUG Meeting (Online)

Woah. I completely forgot to add here (!) :persevere:

Zoom meeting.

Topic: ADUG Perth Meeting - Regroup, Talk, and Planning

Thursday 8th February 2024

6:00pm Meeting open (Perth) … 9pm Eastern time (DST)
6:15pm Presentations start

Presenter - Scott Hollows

Topic - Grab bag of Delphi tips and techniques

Tips and reviews of Delphi code features and quirks based on Scott’s work in Delphi over the past year. It would be nice to have some kind of theme going here, but the closest thing to that is “there is no moral to this story, its just a bunch of stuff that happened” (quote from the Simpsons, lawyer explaining their court defence to a judge) - so random interesting Delphi stuff

As a fun side topic, Scott has been involved in the Technology Museum of WA and will provide an update on what the museum is doing and how you can get involved.

Scott has been involved in the Delphi world since its predecessor Turbo Pascal developing a wide range of applications and helping out on the WA and national committees of ADUG.

[Editor Stan Lee here :
Wow, that is quite the understatement, Buckaroo. Ok, I’m out, true believers. Excelsior! ]

Join Zoom Meeting

Meeting ID: 829 5785 3513
Passcode: 400123

Also you can find us on Meetup dot com now.

During our February meeting, when @scott.hollows was making a point about const [ref] with regard to inheritance and function parameters, I made a mildly successful attempt to explain how C++ can deal with these issues.

(Delphi info eg : delphi - Can I force `const` to pass by reference (aka the missing `in` parameter) - Stack Overflow )

I thought I could do a better job in a few minutes, and just record a better explanation
… instead I have a long, slow battle with my cranial archive to remember stuff I have figured out in the past.

The end result is much longer than I planned, and of limited interest … but for what its worth, here it is :

Or … just see the final code :

#include <iostream>
 C++ has high granularity of its specification of constness around values and pointers

 - value
 - constant value

 - pointer to a value
 - pointer to a constant value

 - constant pointer to a (changeable) value
 - constant pointer to a constant value


int i = 1;
int j = 2;

const int k = 42;

int* pi = &i;             // a pointer to int, can be changed

const int * cpi = &i;     // the pointer CAN    be changed
						  // the TARGET  CANNOT be changed

int* const kpi = &i;      // the pointer CANNOT be changed
						  // the TARGET  CAN    be changed

const int* const xi = 0;  // the pointer CANNOT be changed
						  // the TARGET  CANNOT be changed

int main()
   i = 5;                 //     {normal integer can be changed}
   i = 10;

   //k = 1;  error               {error - const int cannot be changed}

   std::cout << "\n";
   std::cout << "1. Plain pointer pi can be changed, as expected \n";
   std::cout << "\n   " << pi << "\n";
   pi = &j;
   std::cout << "\n   " << pi << "\n\n";

   pi = &i;
   std::cout << "3. Plain pointer pi 's target can be changed, as expected \n";
   std::cout << "\n   " << *pi << "\n";
   *pi = 11;
   std::cout << "\n   " << *pi << "\n\n";

   std::cout << "4. (Const int)* pointer = 'Pointer to a Constant Integer' \n\n";
   std::cout << "   (Const int)* pointer cpi 's pointer can    be changed ... OK \n";
   std::cout << "   (Const int)* pointer cpi 's target  cannot be changed ... OK \n";
   cpi = &i;
   std::cout << "\n   " << *cpi << "\n";
   //*cpi = 100;                 {error - const int* target cannot be changed}
   std::cout << "\n   " << *cpi << "\n\n";

   std::cout << "5. (int)* const pointer = 'Constant Pointer to a (mutable) Integer' \n\n";
   std::cout << "   (int)* const pointer kpi 's pointer cannot be changed ... OK \n";
   std::cout << "   (int)* const pointer kpi 's target  can    be changed ... OK \n";
   std::cout << "\n   " << *kpi << "\n";
   //kpi = &i;                   {error - int* const pointer cannot be reassigned}
   *kpi = 100;
   std::cout << "\n   " << *kpi << "\n\n";

   std::cout << "6. (Const int)* const pointer = 'Constant Pointer to a Constant Integer' \n\n";

   Notes :

   1. If I knew what I was doing before I started,
	  I should have called  'cpi'  as  'pci', ie 'pointer to constant integer'.

   2. While a 'pointer to const' can give some protection of an integer value,
	  If the target is a normal, mutable integer ...
	  then the target can be changed by other parts of the program.

   3. Only a 'pointer to const' can be assigned the address of a constant integer.
	  It can be assigned to a normal integer, and no changes can be effected via that pointer.

   4. The whole "East Const" vs "West Const" rivalry is based on the nutbag idea that, assuming reading types from right to left is what real programmers do, then ``` int const * ``` and ``` int * const ``` read slightly more sanely that wsy. But bear in mind, it's the sanity of C+× programmers that we are talking here,  so ... 🤨 😅


Output :


WADUG Perth Meeting - ONLINE - Tue 12th March 2024. 6pm AWST

Hello everyone.

There’s a lot going on in the Delphi arena.
Officially online meeting, Tuesday night at 6pm. See below for the link.
Hopefully we will get to hear from Peter Thonell about designing a Realtime Strategy Game, but if there’s a schedule issue, we still have a full plate of topics.

First up, a link for Scott Hollows’ presentation last month.
It’s a Google Drive link for now. We will get it onto the WADUG YouTube page as soon as we can.

Registrations are now open for The ADUG Symposium 2024. 4 great speakers, including Mark Fletcher (in my industry) who has an extensive Point of Sale software system, started back in the 1990s.

Scott has further enhanced our WADUG logo :slight_smile:

  • Embarcadero have been making major advances in the C++Builder side of their holdings.

6 months ago :
1 week ago :

  • Rad Studio 12.1 Athens is due out soon. There is a webinar scheduled for 11pm(!) Thu 4th April.
    What’s Coming in Delphi 12.1 Athens :

  • The current US government administration apparently made a commitment to Cyber Security when it gained office.

Sean Parent gave good info last year :
All the Safeties.


Oct 2021, NIST : Guidelines on Minimum Standards for Developer Verification of Software

  • There are recent books out,
  • there will be a big European Delphi conference in the Netherlands,
  • Jim McKeeth working for GDK now will be doing a Delphi tour around the US,
  • and other less directly Delphi topics …

Cheers for now,
Paul McGee

On 08/02/24 1:48 pm, Paul McGee wrote:

Zoom meeting.

Topic: ADUG Perth Meeting

Email or PM  me here for the Zoom link   :

Thank you, everyone that was there last night.
This section was Scott van der Linden talking us through the usefulness of Actions and ActionLists.

Sorry. Late notice.

Perth meeting tonight at 6pm local time (8pm Eastern, I believe)

More details a bit later.

I’m sorry this is so late in providing some details …
But, topic-wise, we have kinda benefited from the delay.

There are many things we can discuss …

  • Release of Delphi 12.1 Athens

  • Perth meeting location

  • $10,000 challenge to get LLMs like ChatGPT ‘thinking’ … claimed within a day

  • Bill Demos on fb (Delphi Developers) angry and then excited about improving fmx animation

  • Linux xz backdoor

  • Delphi and performance

    • the “1 billion line challenge
    • playing with C++ vs Delphi to implement std::next_permutation
    • writing an anagrammer
  • RTTI and Attributes

  • RTTI and Generics for a function that can return any type

  • Testing. DUnit & DUnitX. (and TestInsight)

  • Codesite Express logging

  • A litle bit about either Haskell or Rust, if there’s interest.

  • Delphi YouTube channels and Blogs

Important Happenings in Delphi Land …

  • WADUG meeting. Tue 9th April. Online again.

  • ADUG 2024 Symposium on Fri 17th May. See below for link.

  • Delphi Summit 2024. 2 Day event in the Netherlands, but also online. 13 & 14 June. Delphi Summit 2024 - GDK Software

Thanks all,
Hope to see you online tonight.
Paul McGee

Registrations are now open for The ADUG Symposium 2024. 4 great speakers, including Mark Fletcher (in my industry) who has an extensive Point of Sale software system, started back in the 1990s.

ADUG 2024 Symposium – ADUG

On 08/02/24 1:48 pm, Paul McGee wrote:

Zoom meeting.

Topic: ADUG Perth Meeting

<b>Tuesday 9th April 2024
6:00pm Meeting open (Perth)</b>
6:15pm Presentations start

Join Zoom Meeting

Its a lot later now

… the WA time? the Eastern time? … :slight_smile:


We talked to quite some extent about

  • the $10,000 LLM Prompt-design challenge,

  • the developing Linux xz backdrop drama (sure to become a novel),

  • a purpose-design facility from which we hope WADUG will be joining the symposium this year, AND

  • the Delphi 12.1 release … and current (somewhat encouraging?) Embarcadero vibes.

  • We had a really great demonstration and explanation of RTTI and Attributes by Scott van der Linden, which speaking personally gave me a much better idea about how the Classes that define attributes interact conceptually with the Classes, fields, properties, etc of the “bare” objects and data structures of a program / unit.

  • ie how it adds to the RTTI information cloud around a given data structure … and he demonstrated using, among other examples, DUnitX to point out how the procedures under test, and the Attributes defined, then become the input to the framework to enable it to conduct the testing operations.

  • And then he extended that zinger with an excellent and relatable demonstration of using some of Spring4D’s facilities in working with anonymous functions, predicates, and LINQ-like data manipulation.

  • (I’m hoping we can gently encourage him into a full-length Spring4D presentation for ADUG sometime this year.) :fire:

A full length presentation would be great. Did you record your meeting?

1 Like

Yes Sue. (Also last meeting). We went over 3 hours again ( oops :slight_smile: ) … and we actually haven’t put out the last video yet, let alone this one … but releasing them as soon as we can is the goal post.

Maybe we can try to prioritise splitting out that section.

1 Like

I forgot to post this here … from February.

1 Like

I had kinda sorta misplaced this photo from July 2023 when, with the direct help of @John_Walker, and the goodwill of everyone else, the Perth group started on the road to “Getting the Band Back Together” …

Frank Reynolds, @scott.hollows, John Walker, Some Dumb Guy, @lexedmonds (represented by the mobile phone), Peter Thönell

Perth. 9th April, 2024.

00:00:00 $10,000 GPT Prompt Challenge.
00:18:00 The XZ Linux Backdoor exploit.
00:43:00 RTTI & Attributes.
01:48:00 Spring4D.
02:15:00 RAD Studio Athens 12.1 Release breakdown.
03:00:00 Coroutines
03:05:00 Horizon Digital
03:12:00 Functional Ideas

Great to see the video - and very useful to hear your perspective on things. It’s really useful for me - and in fact others in Embarcadero - to get some unvarnished feedback.

A couple of follow-ups (I haven’t watched the whole thing yet):

  • The post about QP with the link to the new one is here:

  • The “very unhappy guy on Facebook” was put in touch with me and several of us (including Marco) went through what he was saying, discussed it, and filled in a few gaps he had, and he passed on some of his code examples to us too.

  • When he had been emailing us he was using “resumes@” which is not a valid email address so it was falling into a pile of filtered mail. We do go through those, of course, I mean there could be one called “we_attack_at_dawn@” :wink: but it’s obviously not the most efficient route to getting our attention.

When I joined Embarcadero one of the things I really tried to do was make sure people like the guy you mentioned has a name, face, and a specific email address to get in touch. I do always respond, with a genuine response not a canned or AI generated reply. I do not want Embarcadero to seem to be a faceless monolithic corporation and I want users to understand that we actually do listen and we do act on genuine constructive feedback, good, bad, or otherwise.

This guy (I know his name but he uses a pseudonym so I will preserve his anonymity) is a case in point of why it’s important to be seen to be contactable and, more importantly, why a decent, honest, dialogue is the only way to solve things that can be solved and make sure the truth prevails whether it’s on Embarcadero’s side or not.

1 Like

Aargh. I neglected to post about Perth meeting here, yesterday. :frowning:

We would like to hugely thank our surprise guest @drbond Dr Kevin Bond for enthralling us for hours with his extensive experience in the UK education sector, his publishing work, his university and commercial career - and a wide-ranging discussion over many topics of interest. It was a real treat for everyone involved.
And now we have 5 hours of video to deal with. :tada: :disappointed_relieved: :sweat_smile: :grinning:

Next Perth meeting Tue 11th June.
(2nd Tue of the month)

This is the video from March 2024.
A very nice meeting ~3 hrs, covering the following :

00:05:00 VmWare new corporate owner
00:15:30 Wintel Stick, PC on a stick, Intel NUC
00:24:00 Dr Kevin Bond, Horizon Digital
00:34:30 Symposium, Niklaus Wirth commemorative mugs
00:37:20 AI-generated art, and code
00:50:00 C#, C++Builder, Delphi
01:01:00 URCDKey - discount Windows licences
01:11:00 Realtime strategy games, Games development,
01:48:00 Scott van der Linden : [[ TActionList in Delphi ]] [[ Datamodules ]]
02:32:00 Peter T : Smart Pointers, Garbage collection in Delphi
02:41:00 Coroutines, futures, promises, async/await, yield, callbacks
03:15:00 Meeting planning

These time points in the YouTube video description are supposed to cut the timeline into chapters … but maybe I’m doing something wrong. :confused:

1 Like