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MRO::Compat(3pm)      User Contributed Perl Documentation     MRO::Compat(3pm)

       MRO::Compat - mro::* interface compatibility for Perls < 5.9.5

          package PPP;      use base qw/Exporter/;
          package X;        use base qw/PPP/;
          package Y;        use base qw/PPP/;
          package Z;        use base qw/PPP/;

          package FooClass; use base qw/X Y Z/;

          package main;
          use MRO::Compat;
          my $linear = mro::get_linear_isa('FooClass');
          print join(q{, }, @$linear);

          # Prints: FooClass, X, PPP, Exporter, Y, Z

       The "mro" namespace provides several utilities for dealing with method
       resolution order and method caching in general in Perl 5.9.5 and

       This module provides those interfaces for earlier versions of Perl
       (back to 5.6.0 anyways).

       It is a harmless no-op to use this module on 5.9.5+.  That is to say,
       code which properly uses MRO::Compat will work unmodified on both older
       Perls and 5.9.5+.

       If you're writing a piece of software that would like to use the parts
       of 5.9.5+'s mro:: interfaces that are supported here, and you want
       compatibility with older Perls, this is the module for you.

       Some parts of this code will work better and/or faster with
       Class::C3::XS installed (which is an optional prereq of Class::C3,
       which is in turn a prereq of this package), but it's not a requirement.

       This module never exports any functions.  All calls must be fully
       qualified with the "mro::" prefix.

       The interface documentation here serves only as a quick reference of
       what the function basically does, and what differences between
       MRO::Compat and 5.9.5+ one should look out for.  The main docs in
       5.9.5's mro are the real interface docs, and contain a lot of other
       useful information.

   mro::get_linear_isa($classname[, $type])
       Returns an arrayref which is the linearized "ISA" of the given class.
       Uses whichever MRO is currently in effect for that class by default, or
       the given MRO (either "c3" or "dfs" if specified as $type).

       The linearized ISA of a class is a single ordered list of all of the
       classes that would be visited in the process of resolving a method on
       the given class, starting with itself.  It does not include any
       duplicate entries.

       Note that "UNIVERSAL" (and any members of "UNIVERSAL"'s MRO) are not
       part of the MRO of a class, even though all classes implicitly inherit
       methods from "UNIVERSAL" and its parents.

       This allows the "use mro 'dfs'" and "use mro 'c3'" syntaxes, providing
       you "use MRO::Compat" first.  Please see the "USING C3" section for
       additional details.

   mro::set_mro($classname, $type)
       Sets the mro of $classname to one of the types "dfs" or "c3".  Please
       see the "USING C3" section for additional details.

       Returns the MRO of the given class (either "c3" or "dfs").

       It considers any Class::C3-using class to have C3 MRO even before
       Class::C3::initialize() is called.

       Returns an arrayref of classes who are subclasses of the given
       classname.  In other words, classes in whose @ISA hierarchy we appear,
       no matter how indirectly.

       This is much slower on pre-5.9.5 Perls with MRO::Compat than it is on
       5.9.5+, as it has to search the entire package namespace.

       Returns a boolean status indicating whether or not the given classname
       is either "UNIVERSAL" itself, or one of "UNIVERSAL"'s parents by @ISA

       Any class for which this function returns true is "universal" in the
       sense that all classes potentially inherit methods from it.

       Increments "PL_sub_generation", which invalidates method caching in all

       Please note that this is rarely necessary, unless you are dealing with
       a situation which is known to confuse Perl's method caching.

       Invalidates the method cache of any classes dependent on the given
       class.  In MRO::Compat on pre-5.9.5 Perls, this is an alias for
       "mro::invalidate_all_method_caches" above, as pre-5.9.5 Perls have no
       other way to do this.  It will still enforce the requirement that you
       pass it a classname, for compatibility.

       Please note that this is rarely necessary, unless you are dealing with
       a situation which is known to confuse Perl's method caching.

       Returns an integer which is incremented every time a local method of or
       the @ISA of the given package changes on Perl 5.9.5+.  On earlier Perls
       with this MRO::Compat module, it will probably increment a lot more
       often than necessary.

       While this module makes the 5.9.5+ syntaxes "use mro 'c3'" and
       "mro::set_mro("Foo", 'c3')" available on older Perls, it does so merely
       by passing off the work to Class::C3.

       It does not remove the need for you to call "Class::C3::initialize()",
       "Class::C3::reinitialize()", and/or "Class::C3::uninitialize()" at the
       appropriate times as documented in the Class::C3 docs.  These three
       functions are always provided by MRO::Compat, either via Class::C3
       itself on older Perls, or directly as no-ops on 5.9.5+.



       Brandon L. Black, <>

       Copyright 2007-2008 Brandon L. Black <>

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

perl v5.14.2                      2012-12-04                  MRO::Compat(3pm)

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