Attribute::TieClasses - attribute wrappers for CPAN Tie classes


Attribute::TieClasses - attribute wrappers for CPAN Tie classes


  use Attribute::TieClasses;
  my $k : Timeout(EXPIRES => '+2s');
  # loads in Tie::Scalar::Timeout and tie()s $k with those options


Damian Conway's wonderful Attribute::Handlers module provides an easy way to use attributes for tie()ing variables. In effect, the code in the synopsis is simply

        use Attribute::Handlers
            autotie => { Timeout => 'Tie::Scalar::Timeout' };

Still, going one step further, it might be useful to have centrally defined attributes corresponding to commonly used Tie classes found on CPAN.

Simply use()ing this module doesn't bring in all those potential Tie classes; they are only loaded when an attribute is actually used.

The following attributes are defined:

  Attribute name(s)  Variable ref  Class the variable is tied to
  =================  ============  =============================
  Alias              HASH          Tie::AliasHash
  Aliased            HASH          Tie::AliasHash
  Cache              HASH          Tie::Cache
  CharArray          ARRAY         Tie::CharArray
  Counter            SCALAR        Tie::Counter
  Cycle              SCALAR        Tie::Cycle
  DBI                HASH          Tie::DBI
  Decay              SCALAR        Tie::Scalar::Decay
  Defaults           HASH          Tie::HashDefaults
  Dict               HASH          Tie::TieDict
  Dir                HASH          Tie::Dir
  DirHandle          HASH          Tie::DirHandle
  Discovery          HASH          Tie::Discovery
  Dx                 HASH          Tie::DxHash
  Encrypted          HASH          Tie::EncryptedHash
  FileLRU            HASH          Tie::FileLRUCache
  Fixed              HASH          Tie::SubstrHash
  FlipFlop           SCALAR        Tie::FlipFlop
  IPAddrKeyed        HASH          Tie::NetAddr::IP
  Insensitive        HASH          Tie::CPHash
  Ix                 HASH          Tie::IxHash
  LDAP               HASH          Tie::LDAP
  LRU                HASH          Tie::Cache::LRU
  ListKeyed          HASH          Tie::ListKeyedHash
  Math               HASH          Tie::Math
  Mmap               ARRAY         Tie::MmapArray
  NumRange           SCALAR        Tie::NumRange
  NumRangeWrap       SCALAR        Tie::NumRangeWrap (in Tie::NumRange)
  Offset             ARRAY         Tie::OffsetArray
  Ordered            HASH          Tie::LLHash
  PackedInt          ARRAY         Tie::IntegerArray
  PerFH              SCALAR        Tie::PerFH
  Persistent         HASH          Tie::Persistent
  RDBM               HASH          Tie::RDBM
  Range              HASH          Tie::RangeHash
  RangeKeyed         HASH          Tie::RangeHash
  Rank               HASH          Tie::Hash::Rank
  Ranked             HASH          Tie::Hash::Rank
  Ref                HASH          Tie::RefHash
  Regexp             HASH          Tie::RegexpHash
  RegexpKeyed        HASH          Tie::RegexpHash
  Secure             HASH          Tie::SecureHash
  Sentient           HASH          Tie::SentientHash
  Shadow             HASH          Tie::ShadowHash
  Shadowed           HASH          Tie::ShadowHash
  Sort               HASH          Tie::SortHash
  Sorted             HASH          Tie::SortHash
  Strict             HASH          Tie::StrictHash
  Substr             HASH          Tie::SubstrHash
  TextDir            HASH          Tie::TextDir
  Timeout            SCALAR        Tie::Scalar::Timeout
  Toggle             SCALAR        Tie::Toggle
  Transact           HASH          Tie::TransactHash
  TwoLevel           HASH          Tie::TwoLevelHash
  Vec                ARRAY         Tie::VecArray
  Vector             ARRAY         Tie::VecArray
  WarnGlobal         SCALAR        Tie::WarnGlobal::Scalar

I haven't had occasion to test all of these attributes; they were taken from the module descriptions on CPAN. For some modules where the name didn't ideally translate into an attribute name (e.g., Tie::NetAddr::IP), I have taken some artistic liberty to create an attribute name. Some tie classes require the use of the return value from tie() and are as such not directly usable by this mechanism, AFAIK.

No censoring has been done as far as possible; there are several attributes that accomplish more or less the same thing. TIMTOWTDI.

If you want any attribute added or renamed or find any mistakes or omissions, please contact me at <>.


    # Tie::Scalar::Timeout
    my $m : Timeout(NUM_USES => 3, VALUE => 456, POLICY => 777);
    print "$m\n" for 1..5;
    # Tie::Hash::Rank
    my %scores : Ranked;
    %scores = (
        Adams   => 78,
        Davies  => 35,
        Edwards => 84,
        Thomas  => 47
    print "$_: $scores{$_}\n" for qw(Adams Davies Edwards Thomas);
    # Tie::FlipFlop;
    my $ff : FlipFlop(qw/Red Green/);
    print "$ff\n" for 1..5;


None known so far. If you find any bugs or oddities, please do inform the author.


Marcel Grünauer, <>


Copyright 2001 Marcel Grünauer. All rights reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.


perl(1), Attribute::Handlers(3pm).

 Attribute::TieClasses - attribute wrappers for CPAN Tie classes