Re: Writing Iterator in C

[Ralph Hempel <rhempel@...>]

Peter Cawley wrote:
>     Note that p (the control variable) is changed in the body
>     of the for loop, and this works fine in pure Lua.
>
> Well, it shouldn't. Modifying the control variables of a for loop only 
> affects the copy of that variable within the for loop body - not the 
> variable which is passed back into the iteration function (similarly 
> with a numeric for, the control variable is shadowed within the loop body).

That's what I thought reading the PiL manual, but I was not sure
so I tried it. I was a bit surprised that it worked too.

I guess I'll have to keep the function working the way it is
for now, which is OK, I guess.

> Also odd is your use of brackets in Lua return statements. This is 
> invalid in vanilla Lua, and misleading if made valid, as a bracketed 
> expression normally produces exactly one value.

Sorry about that - as you might guess, that was not an actual
copy from the file, I retyped that part and got the C syntax
into my Lua expressions. The actual code does not have the brackets.

And yes, I know that I should have copied the actual file contents
instead of retyping, it was just faster, but in the end incorrect
to do it that way. Lesson learned.

Ralph