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49
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1 package IMPL::Object::Singleton;
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2 use strict;
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3 use warnings;
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4
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5 my %instances;
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6
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7 sub instance {
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8 my $self = shift;
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9
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10 $instances{$self} || ($instances{$self} = $self->new(@_));
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11 }
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12
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13 1;
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14
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15 __END__
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16
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17 =pod
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18
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19 =head1 SYNOPSIS
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20
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88
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21 =begin code
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22
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49
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23 package Foo;
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24
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25 use base qw(IMPL::Object IMPL::Object::Singleton);
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26
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27 #....
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28
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29 Foo->isnatnce->some_work();
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30
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31 Foo->isnatnce->get_result();
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32
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88
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33 =end code
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34
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49
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35 =head1 DESCRIPTION
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36
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37 Реализует шаблон Singleton
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38
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39 =head1 MEMBERS
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40
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41 =head2 OPERATORS
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42
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43 =list
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44
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45 =item C<instance CLASS(@params)>
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46
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47 Создает или возвращает экземпляр класса, если экземляр не существует, то он создается с параметрами C<@params>.
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48
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49 =over
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50
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51 =cut
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