Re: pointer worry

[Dave <dfx1@xxxxxxxxxxxxxx>]

Think I've just answered my question while debugging :

Var1 = Var2 // Where Var2 is based on a pointer.

If I do F11 on Var2 I get " the variable cannot be displayed" but F11
on Var1 works so I'm assuming the value gets copied. Also, I can set
the pointer to null and this has no effect.




2012/7/26 Dave <dfx1@xxxxxxxxxxxxxx>:
> Hi,
>
> I’ve just modified a module that uses a program call using a pointer,
> and I need some reassuring.
>
> My question is, in the example below, If I execute DoStuff1, then
> DoStuff2, have I changed the value of Parm1?
> Does Parm=LocalVar mean that Parm is a copy of the date pointed to by LocalVar?
>
> The 2 procedures cannot run together at the moment, but I don't want
> to think I may have left a booby trap for some future programmer.
> Thanks.
>
>
> In the original module, I had :
>
> DoStuff1 (Parm1);
>
>      P DoStuff1                         PI
>      D Parm
>                        LIKE (…)
>
>      D MyPointer       S               *
>      D LocalVar          S                 N      BASED (MyPointer)
>
>        Call MyPGM(‘1’ : MyPointer)
>
>         Parm = LocalVar;
>         Return;
>
> Then I added :
>
> DoStuff2 (Parm2);
>
>      P DoStuff2                         pi
>      D Parm
>                        LIKE (…)
>
>      D MyPointer       S               *
>      D LocalVar          S                 N      BASED (MyPointer)
>
>        Call MyPGM(‘2’ : MyPointer)
>
>        Parm = LocalVar;
>        Return;