Perl, evaluate string lazily
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by Mike
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Published on 2010-06-03T17:58:12Z
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2010/06/03
18:04 UTC
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Consider the following Perl code.
#!/usr/bin/perl
use strict;
use warnings;
$b="1";
my $a="${b}";
$b="2";
print $a;
The script obviously outputs 1. I would like it to be whatever the current value of $b is.
What would be the smartest way in Perl to achieve lazy evaluation like this? I would like the ${b} to remain "unreplaced" until $a is needed.
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