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Postings from January 2001
On Sun, Jan 07, 2001 at 08:56:32PM +0000, Ton Hospel wrote:
> In article <20010107175242.A1935@pembro26.pmb.ox.ac.uk>,
> Simon Cozens <simon@cozens.net> writes:
> > On Sun, Jan 07, 2001 at 12:30:06PM -0500, Ronald J Kimball wrote:
> >> > sub foo :lvalue {shift} foo($a) = 7
> >>
> >> "it is possible to return a modifiable value from a subroutine" does not at
> >> all mean the same thing as "all values returned from a subroutine are
> >> modifiable".
> >
> > Fair enough. Try this:
> > I am returning a value from a subroutine.
> > The value I am returning is the value of the first parameter.
> > The value of first parameter of the subroutine is modifiable.
> > The value that I am returning is modifiable.
> >
> > Where's the fallacy?
>
> You are returning a COPY of the value of the first parameter.
> shift does not give an lvalue
That is not completely true.
sub abc { return \shift }
$a = 1;
$b = abc($a);
warn $$b;
${$b}++;
warn $a;
Graham.
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