[fpc-pascal] Pointers

[Jonas Maebe]

On 11 Feb 2010, at 18:17, Rainer Stratmann wrote:

> In the past with the turbopascal compiler and other always sizeof  
> byte was
> added.

That is not true. This program prints "2" when compiled under Turbo  
Pascal:

{$t-}

type
   pw = ^word;
var
   w: pw;
begin
   w:=nil;
   inc(w);
   writeln(longint(w));
end.

(and the result does not depend on {$t+} or {$t-}; that only  
influences whether e.g. @wordvar has the type "^word" or plain  
"pointer").

Furthermore, Turbo Pascal did not support performing pointer  
arithmetic using anything else but inc() and dec() (so things like  
"ppp := ppp + http.header_anz" or "w:=w+1" would not compile under  
TP), except for pchar variables (in which case the base value is  
sizeof(char), since that's what a pchar points to).


Jonas