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Re^4: HASH keys preserve class ?

by Limbic~Region (Chancellor)
on Oct 04, 2006 at 15:38 UTC ( #576349=note: print w/replies, xml ) Need Help??

in reply to Re^3: HASH keys preserve class ?
in thread HASH keys preserve class ?

First you say keys are scalars not strings

Hrmm. I guess I should have proofed my response a 4th time before submitting. The first paragraph was intended to address "values" and the second "keys". Where I said "...hash key values can only be scalars.", I meant hash values. In fact, I said that later on in the same paragraph " a hash value can...".

Regarding non-string keys - I assume some trickery that can only be done in XS land would get around perldata. Of course, I don't remember who I heard discussing it or if I understood what they were saying but I suspect it would have been diotalevi or perhaps demerphq.

In any case, my correction to your post was concerning values only. Sorry my incorrect wording implied otherwise.

Cheers - L~R

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Re^5: HASH keys preserve class ?
by BrowserUk (Pope) on Oct 04, 2006 at 16:19 UTC

    It's certainly possible to reverse the stringyfication of references.

    #! perl -slw use strict; use Data::Dumper; use Devel::Pointer; my @a = 1.. 10; my %b = 'a'..'z'; my $c = \ 'A readonly scalar'; my $d = 'a scalar'; my %hash; $hash{ $_ } = 1 for \( @a, %b, $c, $d ); for ( keys %hash ) { m[([^(]+)\(([^)]+)\)] and $1 eq 'HASH' ? print( Dumper unsmash_hv( oct( $2 ) ) ) : $1 eq 'ARRAY' ? print( Dumper unsmash_av( oct( $2 ) ) ) : $1 eq 'REF' ? print( ${ unsmash_sv( oct( $2 )) } ) : $1 eq 'SCALAR'? print( unsmash_sv( oct( $2 ) ) ) : print "Unknown type '$1'"; } __END__ C:\test>junk9 A readonly scalar $VAR1 = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]; a scalar $VAR1 = { 'w' => 'x', 'e' => 'f', 'a' => 'b', 'm' => 'n', 's' => 't', 'y' => 'z', 'u' => 'v', 'c' => 'd', 'k' => 'l', 'q' => 'r', 'g' => 'h', 'i' => 'j', 'o' => 'p' };

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