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Re(2): using strict and functions

by dmmiller2k (Chaplain)
on Jan 18, 2002 at 09:04 UTC ( #139750=note: print w/replies, xml ) Need Help??

in reply to Re: using strict and functions
in thread using strict and functions

This turns sub1 and sub2 into closures (see 'What's a closure?'). While it is not always necessary to use BEGIN blocks, without them (i.e. normal blocks), declaration order becomes significant.

Update: A trick I use occasionally is to declare a set of lexical variables in a BEGIN block along with access functions. Within the program, only the access functions are visible.

BEGIN { my ($var1, $var2, $var3); my @array1; my %hash1; sub var1 { $var1 = $_[0] if @_; $var1 } sub var2 { $var2 = $_[0] if @_; $var2 } sub var3 { $var3 = $_[0] if @_; $var3 } # for arrays and hashes, call in scalar context and # dereference to manipulate contents sub array1 { wantarray ? @array1 : \@array1 } sub hash1 { wantarray ? %hash1 : \%hash1 } }

Of course, rather than hand code access functions for every variable, I typically define a hash containing my variables as keys, and an AUTOLOAD to define access functions dynamically on first use.


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TEACH him to fish and you feed him for a lifetime

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