[fpc-pascal] specify variable name with string variable

[James Richters]

I'm on windows....  

Generics.Collections seems to be something that was added after 3.0.4,  I've downloaded the current FPC source code, but I’m not sure how to build it.. can someone point me in the right direction on how to compile the current source code?

James
-----Original Message-----
From: fpc-pascal <fpc-pascal-bounces at lists.freepascal.org> On Behalf Of James Richters
Sent: Monday, July 8, 2019 6:48 AM
To: 'FPC-Pascal users discussions' <fpc-pascal at lists.freepascal.org>
Subject: Re: [fpc-pascal] specify variable name with string variable

Thank you for the answer and the example... I didn't know there was such a thing as a variable dictionary, but It looks like that may work for me, I'll give it a try!

James
-----Original Message-----
From: fpc-pascal <fpc-pascal-bounces at lists.freepascal.org> On Behalf Of zh loza
Sent: Sunday, July 7, 2019 4:34 PM
To: FPC-Pascal users discussions <fpc-pascal at lists.freepascal.org>
Subject: Re: [fpc-pascal] specify variable name with string variable

Hi all! It's my first answer to the mailing list, hopefully I won't screw anything up.

On Sun, Jul 7, 2019 at 10:58 PM James Richters <james at productionautomation.net> wrote:
>
> This might sound silly,  but is it possible to somehow specify a variable with a string containing the name of the variable?

You might want to try using generic dictionaries. E.g. like this:

program Project1;
uses
  SysUtils, Generics.Collections;

type
  TVariableDictionary = specialize TDictionary<String, PWord>;

var
  MyDictionary: TVariableDictionary;
  MyVariable1: Word;

begin
  MyDictionary := TVariableDictionary.Create;
  MyDictionary.Add('MyVariable1', @MyVariable1);
  MyDictionary['MyVariable1']^ := 100;
  WriteLn(MyVariable1);
  WriteLn(MyDictionary['MyVariable1']^);
  FreeAndNil(MyDictionary);
end.

If you need to address variables of different type, try Variants ( https://wiki.freepascal.org/Variant ).
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