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Inline in Delphi March 23, 2013 No Comments beginner, compiler, delphi, implementation, object pascal, programming languages, windows From Delphi 2007, it is possible to use the keyword inline (similar as C) to explicitly tell the compiler to inline a function or a procedure. Directive definition, serving to direct; directing: a directive board.
The Delphi language in 10.3 has a fairly core change in the way it allows far more flexibility in the declaration of local variables, their scope and lifetime. This is a change that breaks a key tenet of the original Pascal language, but offers a significant number of advantages, reducing unneeded code in several cases. For loopsI'm wondering about for loops, such as in your example:for var I: Integer:= 1 to 10 doShouldn't that always be:for const I: Integer:= 1 to 10 doBecause one is not supposed to ever modify the for loop variable?Or is there some technical reason why var is required, and constmaybe not allowed?Or is it even fancier: perhaps a var inline loop variable can bemodified inside the loop, but the loop will still work and continuewith the next sequential value, regardless of the local modificationinside the loop? (Not that this would be good programming style,but a possibility.)Just curious!Comment by Matthias Bolliger on October 29, 10:18.
Introducing Inline Variables in the Delphi LanguageCan we please also have a bit of syntactic sugar forinterfaces, such as:class function IIntf.Create: IIntf; static;//or even betterconstructor IIntf.Create;Obviously the constructor just translates into astatic class function for the interface. We canalready do this using the known trick of wrapping theinterface inside a record and overloading the implicitoperator, but that's a lot of typing.Much better if the compiler helped us with this.Comment by Johan Bontes on October 29, 13:10. Introducing Inline Variables in the Delphi LanguageHello Marco,I am suggesting that the next release be broken down topurchasable add-on parts so that it is more affordable for everyone.For example, the core compiler with the RTL and basic librariescan have their licenses sold apart from the VCL, Firemonkey,FireDAC, DBExpress, Web development, etc. Core libraries. Thisway we, your customers, can choose what to purchase and savemoney.This is since the collective product is expensive to say the least.Thanks.Comment by Mowafaq on October 29, 13:41. Introducing Inline Variables in the Delphi Language@Franky Brandt: Yes, the variable (I) changes before eachiteration of the for loop, but inside the loop, on each iteration, it isa constant.
(Already today, the documentation states: 'It is illegalto assign a value to the for loop control variable inside the forloop.' And about for-in loops: 'The iteration variable cannot bemodified within the loop.' ) So I thought that 'const' might makethis fact extra clear. Or, perhaps the label var/const could simplyhave been omitted in for loops, since 'const' is obvious, leavingjust:for I: Integer:= 1 to 10 door simply, without any declaration of I anywhere at all:for I:= 1 to 10 doBut I guess this would be a bit confusing. Harry potter 4 movie subtitles for mac. I'm quite OK with 'var' +the good old rule that the control/iteration variable must never bemodified.Comment by for loops, again on October 29, 17:52. Introducing Inline Variables in the Delphi LanguageFWIW, Marco, write:var Intf: IInterface = GetInterface; // Intf.AddRefSmall mistake there.
How to Reset Sims in The Sims 4. The first option you have comes by way of the Cheat Console menu. To open this, hit control + shift + c. Once this menu is open, type. To reset your game: Go to My Documents. Find The Sims 4 folder. Click on it and press Delete. Confirm you want to delete the folder. Empty your Recycle Bin. Restart your computer. How to reset sims 4. Recently my sims 4 has became really slow and lagging. I downloaded a few customised add ons but deleted them after the game was starting to get slower. I really would like to reset the whole game but i dont understand how to!? Testingcheats true method: Type testingcheats true and click Enter. Press the Shift button and then click on the Sim you want to reset. Select the Reset Object (Debug) option.
It should be:var Intf: IInterface:= GetInterface; // Intf.AddRefUnlike global variables, which are initialized withvar X: Integer = 17;local inline variable initialization is with:=,because this is different, see the following paragraph.The initialization expression for an inline vardoesn't have to be a constant expression. It cancontain other variables and function calls.
This iseven so for inline const definitions: theinitialization expression can be a variable expression.Comment by Rudy Velthuison October 29, 22:15. Introducing Inline Variables in the Delphi LanguageDelphi = C now. And this is a bad news.:( Considering SOLIDprinciples, it is a bad idea to put new variables here and there. If afunctional block is too big for you in order to put the variables only ina single place, then it means, that you should divide this block intosmaller functional parts.For schools, there is also no more need to teach Delphi, since nomore strict rules are used and, thus, Delphi became C.Comment by Jacek Krawczyk on October 30, 07:35. Introducing Inline Variables in the Delphi LanguageBRRRRR.!!!!I do some coding in PHP too and on the point where you need avariable, try to remember if you allready have a variable with thesame name. And if you think you have, try to find it back.
And if itneeds initialization, rembember if you initialized it. By searchingthrough your code over and over.In the old school way you can look at the beginning of yourprocedure or function. And if your variable needs a value, give it atthe first line(s) of the function. Clear as that.I did not see any inline procedures/functions in the examples.
So inthose cases you declare your variables old school?So we can mix inline variables and old style var blocks? Evenbetter.I wonder what is more readable and smoother in the end with this.And I don't get what advantage this has and for who.If you want inline variables and accolades consider switching to.NET.Comment by TeoSon November 1, 22:33. Introducing Inline Variables in the Delphi LanguageBlimey, what a lot of odd claims from the downers.If it's too hard to find an inline variable, then youobviously don't really care about procedure length (i.e.those two arguments are mutually exclusive). Introducing Inline Variables in the Delphi LanguageI personally find it to increase readability of mycode in some cases, and declaring a variable and notbeing able to assign it a value in the same line ofcode was pissing me off for so long. Finally I willsave hundreds of lines of unnecessary code perproject, this is great!You guys make a lot of fuss from nothing.
Nobodyforces you to use this feature if you don't like it.Literally, noone here gave a valid reason whyintroducing this is a bad idea.If you think this is so bad, then make a rule in yourcompany to not use it. I am sure, you already haveintroduced coding standard, right? So there isno problem for you whatsoever.Comment by Wodzu on November 12, 12:19. Introducing Inline Variables in the Delphi LanguageA global variable can be initialized like this:vara: integer = 1;Default values for subroutine arguments likewise usean equals sign.Inline variables, however, use a different syntax(colon plus equals):varb: integer:= 1;And while can initialize a variable in a global varsection, you still cannot do this in a var sectionlocal to a subroutine, while doing it inline works.Can someone please clear up this mess?Comment by Jost Riedel on November 25, 17:44.
Introducing Inline Variables in the Delphi LanguageI tried a quick test of the inline variabledeclaration in a forin loop:for var filename in archive.FileNames dobegin.end;archive is an instance of TZipFile.The IDE puts squiggles under var andFileNames. For varit says 'Expected an identifier but received var'. ForFileNames it says 'Expected the end of file butreceived an identifier'.Am I doing something wrong or is this is an issue withthe IDE.I am running 10.3 with update 1.Comment by on April 9, 13:04. Introducing Inline Variables in the Delphi LanguageThe inline vars are great. It would be superb if the for/to syntaxwas extended to 'with' clauses with multiple vars.Something like:with var s:= oShape.Size, k:= Kitten do begink.Height:= s.Height.end;which would finally fix the long forgotten and super useful forreadability 'with' clause.Comment by Steven Blisson April 24, 03:52Post Your CommentClickyour feedback to this blog.There are currently 0 pending (unapproved) messages.
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