Re: RFC 118 (v1) lvalue subs: parameters, explicit assignment, and wantarray() changes

[Graham Barr]

On Thu, Aug 17, 2000 at 07:04:40PM +0200, Johan Vromans wrote:

> And, what would the lvalue routine return? Currently, $a = $b = $c
> implies that both $b and $a get the value $c. But with lvalue subs I
> can write something like
> 
>     yech($foo) = $bar
> 
> that assigns $bar to $foo, and returns something else (e.g., the
> previous value of $foo). 
> 
>     $a = yech($foo) = $bar
> 
> now $a will no longer get $bar assigned.
> 
> Do we want that?

You already do with

  $a = $b = $c

if $b happens to be tied and FETCH returns a different value to what
was passed to STORE

 $a = $b = $c

Does not mean $a will be assign $c, it means $a will get the result of
assigning $c to $a. That is something different.

Graham.