object::accessor.3

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.\" ========================================================================
.\"
.IX Title "Object::Accessor 3"
.TH Object::Accessor 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Object::Accessor
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 5
\&    ### using the object
\&    $obj = Object::Accessor\->new;        # create object
\&    $obj = Object::Accessor\->new(@list); # create object with accessors
\&    $obj = Object::Accessor\->new(\e%h);   # create object with accessors
\&                                         # and their allow handlers
\&
\&    $bool   = $obj\->mk_accessors(\*(Aqfoo\*(Aq); # create accessors
\&    $bool   = $obj\->mk_accessors(        # create accessors with input
\&               {foo => ALLOW_HANDLER} ); # validation
\&                
\&    $clone  = $obj\->mk_clone;            # create a clone of original
\&                                         # object without data
\&    $bool   = $obj\->mk_flush;            # clean out all data
\&
\&    @list   = $obj\->ls_accessors;        # retrieves a list of all
\&                                         # accessors for this object
\&
\&    $bar    = $obj\->foo(\*(Aqbar\*(Aq);          # set \*(Aqfoo\*(Aq to \*(Aqbar\*(Aq
\&    $bar    = $obj\->foo();               # retrieve \*(Aqbar\*(Aq again
\&
\&    $sub    = $obj\->can(\*(Aqfoo\*(Aq);          # retrieve coderef for
\&                                         # \*(Aqfoo\*(Aq accessor
\&    $bar    = $sub\->(\*(Aqbar\*(Aq);             # set \*(Aqfoo\*(Aq via coderef
\&    $bar    = $sub\->();                  # retrieve \*(Aqbar\*(Aq by coderef
\&
\&    ### using the object as base class
\&    package My::Class;
\&    use base \*(AqObject::Accessor\*(Aq;
\&
\&    $obj    = My::Class\->new;               # create base object
\&    $bool   = $obj\->mk_accessors(\*(Aqfoo\*(Aq);    # create accessors, etc...
\&
\&    ### make all attempted access to non\-existant accessors fatal
\&    ### (defaults to false)
\&    $Object::Accessor::FATAL = 1;
\&
\&    ### enable debugging
\&    $Object::Accessor::DEBUG = 1;
\&
\&    ### advanced usage \-\- callbacks
\&    {   my $obj = Object::Accessor\->new(\*(Aqfoo\*(Aq);
\&        $obj\->register_callback( sub { ... } );
\&        
\&        $obj\->foo( 1 ); # these calls invoke the callback you registered
\&        $obj\->foo()     # which allows you to change the get/set 
\&                        # behaviour and what is returned to the caller.
\&    }        
\&
\&    ### advanced usage \-\- lvalue attributes
\&    {   my $obj = Object::Accessor::Lvalue\->new(\*(Aqfoo\*(Aq);
\&        print $obj\->foo = 1;            # will print 1
\&    }
\&
\&    ### advanced usage \-\- scoped attribute values
\&    {   my $obj = Object::Accessor\->new(\*(Aqfoo\*(Aq);
\&        
\&        $obj\->foo( 1 );
\&        print $obj\->foo;                # will print 1
\&
\&        ### bind the scope of the value of attribute \*(Aqfoo\*(Aq
\&        ### to the scope of \*(Aq$x\*(Aq \-\- when $x goes out of 
\&        ### scope, \*(Aqfoo\*(Aqs previous value will be restored
\&        {   $obj\->foo( 2 => \emy $x );
\&            print $obj\->foo, \*(Aq \*(Aq, $x;   # will print \*(Aq2 2\*(Aq
\&        }
\&        print $obj\->foo;                # will print 1
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Object::Accessor\*(C'\fR provides an interface to create per object
accessors (as opposed to per \f(CW\*(C`Class\*(C'\fR accessors, as, for example,
\&\f(CW\*(C`Class::Accessor\*(C'\fR provides).
.PP
You can choose to either subclass this module, and thus using its
accessors on your own module, or to store an \f(CW\*(C`Object::Accessor\*(C'\fR
object inside your own object, and access the accessors from there.
See the \f(CW\*(C`SYNOPSIS\*(C'\fR for examples.
.SH "METHODS"
.IX Header "METHODS"
.ie n .Sh "$object = Object::Accessor\->new( [\s-1ARGS\s0] );"
.el .Sh "\f(CW$object\fP = Object::Accessor\->new( [\s-1ARGS\s0] );"
.IX Subsection "$object = Object::Accessor->new( [ARGS] );"
Creates a new (and empty) \f(CW\*(C`Object::Accessor\*(C'\fR object. This method is
inheritable.
.PP
Any arguments given to \f(CW\*(C`new\*(C'\fR are passed straight to \f(CW\*(C`mk_accessors\*(C'\fR.
.PP
If you want to be able to assign to your accessors as if they
were \f(CW\*(C`lvalue\*(C'\fRs, you should create your object in the 
\&\f(CW\*(C`Object::Acccessor::Lvalue\*(C'\fR namespace instead. See the section
on \f(CW\*(C`LVALUE ACCESSORS\*(C'\fR below.
.ie n .Sh "$bool\fP = \f(CW$object\fP\->mk_accessors( \f(CW@ACCESSORS | \e%ACCESSOR_MAP );"
.el .Sh "\f(CW$bool\fP = \f(CW$object\fP\->mk_accessors( \f(CW@ACCESSORS\fP | \e%ACCESSOR_MAP );"
.IX Subsection "$bool = $object->mk_accessors( @ACCESSORS | %ACCESSOR_MAP );"
Creates a list of accessors for this object (and \f(CW\*(C`NOT\*(C'\fR for other ones
in the same class!).
Will not clobber existing data, so if an accessor already exists,
requesting to create again is effectively a \f(CW\*(C`no\-op\*(C'\fR.
.PP
When providing a \f(CW\*(C`hashref\*(C'\fR as argument, rather than a normal list,
you can specify a list of key/value pairs of accessors and their