view release on metacpan or  search on metacpan

README  view on Meta::CPAN

        my $test = Simple->new({ a => 1, b => 2 })

    Suppose you have a class that has one preferred accessor, and you want
    to simplify its usage so that if the constructor is called with a single
    value, it is passed to that preferred accessor.

    Given that the "Simple" class defines

        sub MUNGE_CONSTRUCTOR_ARGS {
            my $self = shift;
            return %{ $_[0] }    if @_ == 1 && ref($_[0]) eq 'HASH';
            return (b => @_) if @_ % 2;      # odd number of args
            return @_;
        }

    then an object could be constructed like this

        my $test = Simple->new('blah');

    which would be munged to be equivalent to

        my $test = Simple->new(b => 'blah');

    If you define an "init()" method, the constructor calls it with the
    munged args as the very last thing.

  mk_constructor_with_dirty
    Like "mk_constructor()", but also keeps track of whether the object has
    been modified. This is useful, for example, when you have read the
    object from a storage and at the end you want to write it back if it has
    changed. This method generated saves you from having to update a
    dirty-flag in each accessor. It achieves its purpose by doing a tie() on
    the blessed hash that is the object, so there is some performance
    penalty. But it also works when someone tries to break encapsulation by
    accessing hash elements directly instead of going via the accessors. See
    Class::Accessor::Constructor::Base for details.

    If you want that behaviour only in a part of your inheritance tree,
    redefine the constructor at the appropriate point. For example:

        package Foo;
        use base 'Class::Accessor::Constructor';

        __PACKAGE__->mk_constructor;

        package Bar;
        use base 'Foo';
        __PACKAGE__->mk_constructor_with_dirty;

    Now objects of type "Foo" will not keep a dirty-flag, but objects of
    type "Bar" and its descendants will.

  mk_singleton_constructor
    Like "constructor" but constructs a singleton object.

INSTALLATION
    See perlmodinstall for information and options on installing Perl
    modules.

BUGS AND LIMITATIONS
    No bugs have been reported.

    Please report any bugs or feature requests through the web interface at
    <http://rt.cpan.org/Public/Dist/Display.html?Name=Class-Accessor-Constru
    ctor>.

AVAILABILITY
    The latest version of this module is available from the Comprehensive
    Perl Archive Network (CPAN). Visit <http://www.perl.com/CPAN/> to find a
    CPAN site near you, or see
    <http://search.cpan.org/dist/Class-Accessor-Constructor/>.

    The development version lives at
    <http://github.com/hanekomu/Class-Accessor-Constructor> and may be
    cloned from <git://github.com/hanekomu/Class-Accessor-Constructor.git>.
    Instead of sending patches, please fork this project using the standard
    git and github infrastructure.

AUTHOR
    Marcel Gruenauer <marcel@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2007 by Marcel Gruenauer.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.