I used "dualvar" also, in MCE::Shared::Cache. When max_age is specified during construction of the cache, the dualvar is used internally to store the expiration time with the key name in the keys array.

# update expiration
$keys->[ $off ] = ( $exptime >= 0 )
   ? dualvar( time + $exptime, $_[1] )
   : dualvar( -1, $_[1] );

[download]

Basically, the "dualvar" capability in Perl allows the "max_age" feature without increasing the memory consumption of the cache or impacting performance.

In reply to Re^3: Schizophrenic var by marioroy
in thread Schizophrenic var by bliako

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