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Re^2: Scalar refs, aliasing, and recursion weirdness.

by BrowserUk (Pope)
on Feb 04, 2005 at 23:33 UTC ( #428246=note: print w/replies, xml ) Need Help??


in reply to Re: Scalar refs, aliasing, and recursion weirdness.
in thread Scalar refs, aliasing, and recursion weirdness.

I think you may have hit the nail on the head.

It would appear that if you modify an lvalue ref, it gets converted to a normal scalar before the modification.

Which is annoying and counter-intuative (to me anyway), but maybe work that would be involved in allowing the underlying scalar to be modified through a substring of an lvalue ref is too complicated?

Maybe I will have to code my own lvalue-ref-on-steroids to achieve my purpose?


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  • Comment on Re^2: Scalar refs, aliasing, and recursion weirdness.

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Re^3: Scalar refs, aliasing, and recursion weirdness.
by !1 (Hermit) on Feb 04, 2005 at 23:38 UTC

    Even better example:

    #! perl -slw use strict; sub recurse { print ">> '${ $_[ 0 ] }'"; (my $depth=$_[1])--; if ($depth) { recurse( \ substr( ${ $_[ 0 ] }, 1, -1 ), $depth ); } else { ${$_[0]} = "XX"; } print "<< '${ $_[ 0 ] }'"; return; } my $str = 'abcdefghi'; recurse \$str, 3; print $str; recurse \$str, 2; print $str; __END__ >> 'abcdefghi' >> 'bcdefgh' >> 'cdefg' << 'XX' << 'bcdefgh' << 'abcdefghi' abcdefghi >> 'abcdefghi' >> 'bcdefgh' << 'XXi' << 'aXXi' aXXi

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