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Re: Making variables visible between calls.

by friedo (Prior)
on Dec 12, 2008 at 18:12 UTC ( #730004=note: print w/replies, xml ) Need Help??

in reply to Making variables visible between calls.

Your anonymous subroutine can't see $var since it's compiled in a lexical scope separate from where it's executed. But it can have values passed into it as arguments.

sub create_f { my $func = shift; return sub { my $var = "xpto"; $func->( $var ); } } my $function = create_f( sub { print ">> $_[0] <<\n" } ); $function->();

Update: And if you want to specify the value at runtime, it's as easy as passing it into create_f.

sub create_f { my $func = shift; my $var = shift; return sub { $func->( $var ); } } my $function = create_f( sub { print ">> $_[0] <<\n" }, 'xpto' ); $function->();

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Node Type: note [id://730004]
[james28909]: how can i write a while loop on one line (in a script) something like print "this\n" && print "that" && <DATA> && print the other\n" && next if /this matches/ while <DATA>?
[james28909]: i have tried with && and and and have tried to rearrange the functions as well to no avail
[shmem]: use parens to group expressions
[shmem]: you can't use next in a statement modifier
[shmem]: next requires a BLOCK

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