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package Data::Monad::Singleton; |
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use strict; |
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use warnings; |
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use parent qw/Data::Monad::Base::Monad/; |
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use Exporter qw/import/; |
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our @EXPORT = qw/singleton/; |
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sub singleton { __PACKAGE__->new } |
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my $instance = bless \(my $x = '*'), __PACKAGE__; |
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sub new { $instance } |
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sub unit { singleton } |
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sub flat_map { singleton } |
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1; |
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__END__ |