Various modules in MCE::Shared can be used directly (non-shared construction). Many classes MCE::Shared::{ Array, Cache, Hash, Minidb, and Ordhash } have query capabilities. The query logic lives in MCE::Shared::Base.

See Syntax for Query String using MCE::Shared::Hash. Typically, the "keys" method returns all the keys. Here, a query string is specified to return keys that match a regular expression. Subsequently, depending on the price.

use strict;
use warnings;
use MCE::Shared::Hash;

my $prices = MCE::Shared::Hash->new();

$prices->{'pizza'} = 12.00;
$prices->{'coke'} = 1.25;
$prices->{'sandwich'} = 3.00;

if ($prices->keys("key =~ /cok/"))
{
  print "found the key 'cok' in the hash\n";
}

if ($prices->keys("key =~ /cok/ :AND val >= 1.50"))
{
  print "found the key 'cok' in the hash greater than or equal \$1.50\
+n";
}

if ($prices->keys("key =~ /cok/ :AND val < 1.50"))
{
  print "found the key 'cok' in the hash less than \$1.50\n";
}

__END__
found the key 'cok' in the hash
found the key 'cok' in the hash less than $1.50

[download]

Q. Why were query capabilities added to MCE::Shared classes?

A. In the context of sharing, the query mechanism is beneficial for the shared-manager process. It is able to perform the query where the data resides versus client-process(es) iterating involving lots of IPC.

In reply to Re: Check if key exist in hash but not exact match - MCE::Shared::Hash by marioroy
in thread Check if key exist in hash but not exact match by Anonymous Monk

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