Re^2: HTML::LinkExtor weirdness (scoping closures nested named subs)

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Re^3: HTML::LinkExtor weirdness (scoping closures nested named subs) by ig (Vicar) on Nov 06, 2013 at 23:41 UTC
The error message Variable "%s" will not stay shared is described in perldiag. The description is brief but explains the behavior you experienced. You can also read about closure in perlref, perlsub and elsewhere.	[reply]
Re^3: HTML::LinkExtor weirdness (scoping closures nested named subs) by Anonymous Monk on Nov 07, 2013 at 00:27 UTC
This is why you don't nest named subs, the closure becomes "static" `perl -E " sub f{ my %g; sub g{say \%g; } g(); say \%g; \%g } say f(),$/ for 1 .. 4;"` `perl -E ' sub f{ my %g; sub g{say \%g; } g(); say \%g; \%g } say f(),$/ for 1 .. 4; '` `HASH(0xabd9c4) HASH(0xabd9c4) HASH(0xabd9c4) HASH(0xabd9c4) HASH(0x3f9b6c) HASH(0x3f9b6c) HASH(0xabd9c4) HASH(0x3f9b8c) HASH(0x3f9b8c) HASH(0xabd9c4) HASH(0x3f9b6c) HASH(0x3f9b6c)` By making the nested subroutine a variable (also known as an anonymous sub), the closure is dynamic `$ perl -lE " sub f{ my %g; my $g = sub {say \%g; $g{1}++}; $g->(); say \%g; \%g } say f(),$/ for 1 .. 4;"` `HASH(0xabd9d4) HASH(0xabd9d4) HASH(0xabd9d4) HASH(0x3f9b1c) HASH(0x3f9b1c) HASH(0x3f9b1c) HASH(0x99b374) HASH(0x99b374) HASH(0x99b374) HASH(0x99b344) HASH(0x99b344) HASH(0x99b344)`	[reply]
Re^3: HTML::LinkExtor weirdness (scoping closures nested named subs) by Anonymous Monk on Nov 06, 2013 at 23:34 UTC
I linked it already, just follow the linked links :)	[reply]