On Sun, 10 Sep 2017, Bo Berglund wrote:
Coming from Delphi I am a bit confused about the syntax when dealing with procedure arguments specified as var...
FPC is exactly the same regarding this.
In Delphi this is all taken care of by the compiler and the declaration of the procedure tells it how to deal with the arguments. Like so: procedure DoSomething(var Cnt: integer); called in FPC by: DoSomething(@MyCount);
No it is not.
But in Delphi it is just: DoSomething(MyCount);
It is the same in FPC.
OK, I can live with this, but next comes objects and dynamic arrays and such... When is it appropriate to use @ and when should it not be used? procedure SendData(var Buf: TBytes); procedure DigOutStuff(var MyCase: TCaseObject); Are these also called with @ or something else?
No, why do you think so ?
I think that in Delphi it is enough to use the variable name in all cases.
It is exacly the same in FPC. The only place where FPC differs from Delphi is when you assign a procedure to a procedural variable. Procedure MyProcedure; begin end; Var p : Procedure; begin P:=@MyProcedure; end.
Is there an authoritative document describing this for FPC somewhere?
How about the Language reference guide ? https://www.freepascal.org/docs.var Michael. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
