How do you give functions private variables that retain their values between calls?
Q
How do you give functions private variables that retain their values between calls?
✍: Guest
A
Create a scope surrounding that sub that contains lexicals.
Only lexical variables are truly private, and they will
persist even when their block exits if something still
cares about them. Thus:
{ my $i = 0; sub next_i { $i++ } sub last_i { --$i } }
creates two functions that share a private variable. The
$i variable will not be deallocated when its block goes
away because next_i and last_i need to be able to access it.
2013-09-25, 2164👍, 0💬
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