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Postings from April 2000
On Sat, Apr 15, 2000 at 02:01:44PM -0400, Ronald J Kimball wrote:
> > > Ex2:
> > > @_ = map{
> > > $_ += 1;
> > > }(5,2,7,0,7,7);
> > >
> > > Exception: Modification of a read-only value attempted at 1.pl line 1
> >
> > Why are you surprised? Did you mean map {$_ + 1} ?
>
> He's surprised because this doesn't produce the same error:
>
> @_ = map {
> $_ += 1;
> } 1 .. 6;
Oh, *this* bug:
> perl -wle "sub a {map {print; ++$_} 1..3} a;print'';a"
1
2
3
2
3
4
It was discussed here many years ago already. It is my long-held
opinion that these values (produced at compile time) should be marked
read-only.
Ilya
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