[fpc-pascal] Bls: Bls: Quick Modern Object Pascal Introduction, for Programmers

Mr Bee pak.lebah at yahoo.com
Tue Jun 21 08:57:59 CEST 2016


> Maybe a little bit offtopic, but I have a question regarding the compiler directives: is there a way to tell Lazarus to use these directives in every new unit? I even expect a bit further. These {$MODE OBJFPC}, {$H+}, and {$J-} directives should be the *default* directives for every new FPC programs/units. We're now using Free Pascal compiler on 2016. Why do we need to explicitly declare Free Pascal mode in a Free Pascal program? In 21st century, our string should not be limited to 255 chars anymore. And what the hell is "writable constant"? It's contradictio in terminis. :)
If somehow someone want to deals with those things, let them use the appropriate directives explicitly. But for most programs we build today, those things should be the default.

–Mr Bee
 

    Pada Selasa, 21 Juni 2016 13:15, Marc Hanisch <marc.hanisch at googlemail.com> menulis:
 

 Thanks Michalis for your excellent work! It's very important to left the early 90s associated with Pascal programming behind us and to encourage new developers to have a look onto the modern aspects of Object Pascal!
Maybe a little bit offtopic, but I have a question regarding the compiler directives: is there a way to tell Lazarus to use these directives in every new unit?
Best regards,Marc
2016-06-21 7:47 GMT+02:00 Michalis Kamburelis <michalis.kambi at gmail.com>:

2016-06-20 5:31 GMT+02:00 Mr Bee <pak.lebah at yahoo.com>:
[...]
> I have a little suggestion though. I prefer to use {$J-} directive in my
> Pascal program. I think it encourages good programming practice in Pascal.
> The {$J-} means constant is a constant no matter how you declare it. To bad
> FPC is still using {$J+} as the default even in the {$MODE OBJFPC}, which
> means a constant becomes a variable once you include the data type
> eventhough it's declared within a 'const' block. CMIIW.
>

Ouch. For some reason, I thought that {$J-} is the default in {$mode
objfpc} since years, and we have left that mistake behind us. Quick
test showed me that I was mistaken. This makes a *lot* of my code less
safe that I assumed, as in many recent projects I didn't bother to
explicitly use {$J-}.

This is an excellent suggestion then, thank you. I updated the
document to encourage everywhere doing

  {$mode objfpc}{$H+}{$J-}

at the beginning.

I definitely *do not want* to explain to any new programmer what a
"writeable constant" is... This concept should remain buried:)

Regards,
Michalis
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