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Re^8: Shouldn't references be readonly?

by LanX (Saint)
on Aug 05, 2020 at 18:53 UTC ( [id://11120344]=note: print w/replies, xml ) Need Help??


in reply to Re^7: Shouldn't references be readonly?
in thread Shouldn't LITERAL references be readonly? (updated)

Nope typeglobs are only one of many possibilities to have aliases.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

Replies are listed 'Best First'.
Re^9: Shouldn't references be readonly?
by jo37 (Deacon) on Aug 05, 2020 at 19:21 UTC

    This confuses me. Could you explain some of these many other ways to create aliases that end up in something different? An alias creation that does not put a reference into a symbol table entry slot?

    Greetings,
    -jo

    $gryYup$d0ylprbpriprrYpkJl2xyl~rzg??P~5lp2hyl0p$
      Could you explain some of these many other ways to create aliases that end up in something different?

      I named other ways in this node: @_, foreach, map, grep.

      sure see Re^6: Shouldn't references be readonly?

      DB<76> sub change { $_[0] = 666 } DB<77> $a=42 DB<78> change($a) DB<79> p $a 666 DB<80> change(42) Modification of a read-only value attempted at (eval 86)[c:/Perl_524/l +ib/perl5db.pl:737] line 2. DB<81>

      still "lame"?

      Cheers Rolf
      (addicted to the Perl Programming Language :)
      Wikisyntax for the Monastery

      update

      BUT!!!

      DB<81> sub change_arr { $_[0] = [666] } DB<82> $a=[42] DB<83> change_arr($a) DB<84> x $a 0 ARRAY(0x3363180) 0 666 DB<85> change_arr([42]) #NO ERROR??? DB<86>

        This is no answer to my question. My point is: however created, an alias is a reference to something put into a slot of a symbol table entry. I do not see any evidence in your examples against this claim.

        UPDATE And then again, a de-referenced reference should behave similar to an alias. AFAICS it does.

        Greetings,
        -jo

        $gryYup$d0ylprbpriprrYpkJl2xyl~rzg??P~5lp2hyl0p$

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