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Re: [Groff] question regarding PIC and variable scoping
From: |
Werner LEMBERG |
Subject: |
Re: [Groff] question regarding PIC and variable scoping |
Date: |
Mon, 24 Jun 2002 19:32:12 +0200 (CEST) |
> [About accessing a GNU pic variable in a block from outside]
> > I think we agree that the above reference implies that i can do
> > something like last [].variable. This is exactly the documentation
> > i was refering to. So either the documentation should clarify this
> > important distinction between variables and labels (and take out
> > "variable or") or perhaps there is a way to add that functionality?
>
> This functionality is already available. I've added the following to
> pic.ms:
>
> Variables in a block can't be directly accessed from outside; they
> must be converted into a position:
>
> A: [
> xy = 5;
> Xy: (xy,0);
> ]
> print A.Xy.x
Oops! Error! Please ignore this. The right way to export the value
of a variable within a block to the outside is to use the `:='
operator. The only (minor) restriction is that a variable has to be
defined already outside of the block before you can use `:='.
Example:
.PS
x=5
y=5
[
x:=3
y=3
]
print x " " y
.PE
Result of this is `3 5'.
I've reworded the documentation in both pic.man and pic.ms which was
very misleading IMHO.
Werner