Dave Novo

The reason I was thinking of using ISet is just that Delphi is very verbose: if myEnum in myset then is not so bad but if [enum1,enum2] * myset <> [] then is obscure and if you dont use this syntax frequently you are constantly reminding yourself what the intention was, particularly for more complex set operations. I feel that if mySet.DoesNotContainAny([enum1,enum2]) then is much easier to understand the intention. Not as performant of course.

Oh thanks. I did not think to go all the way up to enumerable, as I am used to that interface just being for enumeration. I will investigate that further....

I am a bit new to spring 4D, and am attempting to use ISet<T> as a replacement of the standard set of <type> in Delphi. How do you easily check if an value is in a ISet<T> The use case I have is with an enum. Where TEnumSet = set of enum; In Delphi I would do if myEnumToCheckFor in MySet then ..... I had expected to see a method ISet<T>.Contains<T>:Boolean, or something along those lines, but I don't see anything. It seems like ISet<T> has lots of helpful methods for dealing with other sets, but I cannot find anything to check if an individual item is in the set. Of course, I can create a new set that contains 1 item and use that, but it seems overkill to do presuming Myset:=ISet<some enum> if MySet.InsersetsWith(TCollections.CreateSet([myenumTocheckFor])) do.... am I missing something? note: sorry, I meant to put this in 3rd party, but somehow it ended up here. I cannot seem to find a way to move it to the 3rd party subforum.

This may just be a semantic issue. The OP wrote he was "storing" the sum in a label, maybe he meant display. @Anders Melander is correct, data should be stored in variables/fields etc. Of course, if you need to display to the user, some UI control is needed. I have seen too much code where some value was actually stored in a UI control, and the only way to get the current state of that value was to reference the UI control. That is bad.

Parallelizing works well if you can break your overall job into multiple independent tasks, and each task can operate independently of the results of the other task. If the tasks depend on each other in any way, it becomes quite complex quite quickly, generally having to introduce locking and communication mechanisms. In the case of RegEx parsing, how would you break your overall search into multiple independent searches. I dont see an easy way to do this. Each match depends on the results of previous matches. I am not saying it cannot be done, someone might have thought of something extremely clever, but its going to be complicated I think.

The other thing I would suggest is to have a look at the "implements" keyword. Please consider the code below as pseudocode ICommonFuncs=Interface procedure CommonProc; end TCommonObj=class(TInterfacedObject,ICommonFunc) procedure CommonProc end TapRectangle=class(TRectangle, ICommonFunc) private FCommonObj:ICommonFunc function GetCommonFuncImp:TICommonFunc; public constructor Create; property CommonFuncImpl:ICommonFunc read GetCommonFuncImpl implements ICommonFunc; end constructor TapRectangle.Create; begin FCommonObj:=TCommonObj.Create as ICommonFunc; end The idea here is that the functionality needed for ICommonFunc is actually implemented by a separate object. When you query the ICommonFunc interface from TRectangle you get it from FCommobObj. You can then easily add the same functionality to TCircle in the same way. In general, FCommonObj may need some way to talk back to its owning object to get some specific information. This is helpful if the methods FCommonObj/ICommonFunc follow a template patter where most of the code is in TCommonObj but there is some specific information needed from TRectangle or TCircle.

I agree with Anders. This question is impossible to answer. An MVP for a "Sale Management and POS software" for one group of products is completely different than from another group of products. i.e. an MVP for selling gumballs is a totally different ballgame from an MVP for a product cars. If deciding an MVP is so simple that you can create one from asking a 1 sentence question to a group of people who know nothing about what you are doing then there would be no need for any domain experts for anything in software development.

There is also FastMM5. However, I would suggest looking at your code and figuring out a way to allocate required memory (even if you have to overallocate) and minimize/eliminate heap memory allocations during the threading code.

They did a bunch of work recently to autoscale fonts based on the DPI. There is are some new enums to control this TCanvasZoomText=(ztManual, ztNo, ztAuto); TCanvasZoomPen=(zpManual, zpNo, zpAuto);

Hello all, If you go to the Delphi help Docking (Delphi) - RAD Studio Code Examples (embarcadero.com) You see if refers to a "docking demo". The general help for the built is docking is woefully inadequate. If you go to RAD Studio Code Examples (embarcadero.com) You find that the code examples are supposed to be at Embarcadero Technologies · GitHub or GitHub - Embarcadero/RADStudio11Demos: Delphi and C++Builder Demos for Embarcadero RAD Studio version 11 I cannot find a docking demo in either location. Has this been removed from the demos? Or am I just going crazy and its really there. Searching the github for the work "dock" and also cloning the repo and searching for "dock" does not turn up any files

Hello, Is there an example of how TPropertyChangedEventArgs and associated infrastructure is supposed to be used? I am hoping there is some magic somehow where I can get a notification that a property changed on a class, without having to modify the source of that class to throw an event. Not sure how this would be done, magic code hooks, VMT hijacking or some other craziness. But when I see some of the magic in Spring4D, I can believe that almost anything is possible 🙂

I never meant to imply that it was unnecessary. In fact, I already applied your excellent code to my own code that was writing out CSV files from large 2D matrices of integers. I was just wondering if there was a wider variety of circumstances that I could also leverage this technique that I was not thinking of. In fact, I also have to write out large matrices of floating point values, so will try to modify the Delphi float conversion routines to work on array of char similar to what you proposed below. TBH though, I have not done much timing. I wonder if the overhead of writing the file to disk dwarfs the time it takes for the conversions.

I am trying to understand when this stack based allocation can practically help, because it seems to me that for the most part, you usually are going to have to do something with this array of char, and inevitably transform it to a string which will do some heap allocation and copy the stack data. The one thing that pops to my head is if saving a large number of integers to a file (as strings of course), when you can write to the file directly from the char buffer allocated on the stack. Then you avoid any heap allocation for a large number of conversions. Are there many other circumstances where you can avoid the eventual conversion to a heap allocated string and reap the benefits of the stack based memory allocation? It seems limited to areas where you are doing large numbers of IntToStr and only need to keep the string value within the local method within the loop.

Correct, we sort arrays of integers and floats all the time. Both double and single. And have to process these millions of values as well. By "process" I mean perform mathematical operations on them. For us the Dew Research library mtxVec has proven invaluable.

We write software that does scientific data analysis. We regularly have to sort arrays of millions of elements of data. But I recognize we are in the minority of developers.