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package PLP::Tie::Delay; |
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use strict; |
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no strict 'refs'; |
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use warnings; |
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our $VERSION = '1.00'; |
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=head1 PLP::Tie::Delay |
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Delays hash generation. Unties the hash on first access, and replaces it by the generated one. |
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Uses symbolic references, because circular ties make Perl go nuts :) |
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tie %Some::hash, 'PLP::Tie::Delay', 'Some::hash', sub { \%generated_hash }; |
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This module is part of the PLP internals and probably not of any use to others. |
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=cut |
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sub _replace { |
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my ($self) = @_; |
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untie %{ $self->[0] }; |
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# I'd like to use *{ $self->[0] } = $self->[1]->(); here, |
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# but that causes all sorts of problems. The hash is accessible from |
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# within this sub, but not where its creation was triggered. |
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# Immediately after the triggering statement, the hash becomes available |
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# to all: even the scope where the previous access attempt failed. |
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%{ $self->[0] } = %{ $self->[1]->() } |
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} |
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sub TIEHASH { |
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# my ($class, $hash, $source) = @_; |
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return bless [ @_[1, 2] ], $_[0]; |
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} |
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sub FETCH { |
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my ($self, $key) = @_; |
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$self->_replace; |
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return $self->[0]->{$key}; |
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} |
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sub STORE { |
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my ($self, $key, $value) = @_; |
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$self->_replace; |
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return $self->[0]->{$key} = $value; |
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} |
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sub DELETE { |
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my ($self, $key) = @_; |
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$self->_replace; |
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return delete $self->[0]->{$key}; |
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} |
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56
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sub CLEAR { |
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my ($self) = @_; |
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$self->_replace; |
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return %{ $self->[0] }; |
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} |
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sub EXISTS { |
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my ($self, $key) = @_; |
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$self->_replace; |
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return exists $self->[0]->{$key}; |
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} |
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68
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sub FIRSTKEY { |
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my ($self) = @_; |
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$self->_replace; |
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0
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return 'PLPdummy'; |
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} |
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74
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sub NEXTKEY { |
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# Let's hope this never happens. (It's shouldn't.) |
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0
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0
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return undef; |
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} |
78
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79
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0
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0
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sub UNTIE { } |
80
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81
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0
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0
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sub DESTROY { } |
82
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83
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1; |
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