Question on "absolute"

[Ten_Mile_Hike]

Code: Text  [Select][+][-]

1. I understand the absolute concept. My question is
2. if I make a local variable "X" absolute to a global variable "XX"
3. as in the code below, am I "technically" correct in saying that for
4. all intents and purposes that my local variable is then
5. actually made into a global variable?
6. ie:  Pressing Button1 then Button2 gives me 102

Code: Pascal  [Select][+][-]

1. var
2.   Form1: TForm1;
3.   xx: integer;
4. implementation {$R *.lfm} { TForm1 }
5.  
6. procedure TForm1.Button1Click(Sender: TObject);
7. var
8.   x: integer absolute xx;
9. begin
10.   x:=102;
11. end;
12.  
13. procedure TForm1.Button2Click(Sender: TObject);
14. var
15.   y: integer absolute xx;
16. begin
17.   form1.Caption := ' y = '+IntToStr(y)+' ';
18. end;                  

[Fibonacci]

Yes

[jamie]

Keep in mind, it's also a quick way to cast over items like a WORD where you have a Byte type that can point to a WORD type.
this at lest gets the low bound without using LO.

also, I think you can even offset the address to get the high bound?

So this allows you to have two variables pointing to a single variable of different type.

Code: Pascal  [Select][+][-]

1. procedure TForm1.Button1Click(Sender: TObject);
2. Type
3.   TR = Record B:Array[0..3] of Byte End;
4. Var
5.   W:DWORD;
6.   R :TR absolute W;
7. begin
8.    WIth R do
9.    Begin
10.     b[0]:=  192;
11.     b[1]:=   168;
12.     B[2]:=  Random(10);
13.     B[3]:=  Random(255);
14.    End;
15. end;                        
16.  

Something like that!

[Thaddy]

We have variant records for that. The use of absolute is usually not recommended and it is easy to make mistakes in its use.

Code: Pascal  [Select][+][-]

1. Type
2.   TR = Record
3.          case boolean of
4.          false:(B:Array[0..3] of Byte;);
5.          true :(W:dword;);
6.       end;
7. Var
8.   R :TR;
9. begin
10.    WIth R do
11.    Begin
12.     b[0]:=  192;
13.     b[1]:=   168;
14.     B[2]:=  Random(10);
15.     B[3]:=  Random(255);
16.    End;
17. end.

                     

[d2010]

We have variant records for that. The use of absolute is usually not recommended and it is easy to make mistakes in its use.

Yes i think the "absolute of var" generate too much crash, inside run-time (even
TurboPascal  for windows3.1", the "absolute" is very worst.
 Delphi5 not more used?