Class::Meta::Declare 0.04

Class::Meta::Declare 0.04

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File size: 0.015 MB Platform: Any Platform License: Perl Artistic License Price: Downloads: 8759 Date added: 2006-09-27 Publisher: Curtis Poe Publisher URL: http://search.cpan.org/~j

Class::Meta::Declare 0.04 description

Class::Meta::Declare is a Perl module deprecated in favor of Class::Meta::Express.

SYNOPSIS

This was a first attempt at making a saner interface for Class::Meta. It is nicer, but Class::Meta::Express is nicer still. Go use that one.

package MyApp::Thingy;
use Class::Meta::Declare :all;
use Data::UUID;

Class::Meta::Declare->new(
meta => [
key => thingy,
accessors => $ACC_SEMI_AFFORDANCE,
],
attributes => [
pi => {
context => $CTXT_CLASS,
authz => $AUTHZ_READ,
default => 3.1415927,
},
id => {
authz => $AUTHZ_READ,
type => $TYPE_STRING,
default => sub { Data::UUID->new->create_str },
},
name => {
required => 1,
type => $TYPE_STRING,
default => No Name Supplied,
},
age => { type => $TYPE_INTEGER, },
],
methods => [
some_method => {
view => $VIEW_PUBLIC,
code => sub {
my $self = shift;
return [ reverse @_ ];
},
}
]
);

my $object = MyApp::Thingy->new;
print MyApp::Thingy->pi; # prints 3.1415927
print $object->name; # prints "No Name Supplied;
$object->set_name("bob");
print $object->name; # prints "bob"

This class provides an alternate interface for Class::Meta.

Class::Meta is a useful module which allows one to create Perl classes which support introspection (also known as reflection). Typically Perl classes, when created, dont supply a lot of metadata. Imported helper functions show up when you call $object->can($method). Private, protected and trusted methods are not readily supported. Fetching a list of attributes or methods is a haphazard affair. Class::Meta overcomes these shortcomings by building the classes for you and allowing you to fetch a class object:

my $class_object = $object->my_class;

foreach my $attribute ( $class_object->attributes ) {
print $attribute->name, "n";
}
foreach my $method ( $class_object->methods ) {
print $method->name, "n";
}

If youve set up your class correctly, these properties are now easy to discover.

Unfortunately, many find the Class::Meta interface to be a bit clumsy. As an alternative, Class::Meta::Declare allows you to declare your entire class in a single argument list to the constructor and have the class built for you automatically. Further, reasonable defaults are provided for just about everything.

IMPORTANT: You want this class or Class::Meta if you need an introspection API for your classes. If you do not need introspection or dynamic class generation, these modules are overkill.

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Class::Meta::Declare 0.04 Related Software


HTML::Declare is a Perl module for When Template Systems Are Too Huge And Heredocs Too Messy.

Class::Declare is a Perl module created to declare classes with public, private and protected attributes and methods.

Class::Declare::Attributes is a Perl module with Class::Declare method types using Perl attributes.

Class::HPLOO is an easier way to declare classes on Perl, based in the popular class {...} style and ePod.

Getopt::Declare is a Perl module with Declaratively Expressed Command-Line Arguments via Regular Expressions.

Class::MOP is a Meta Object Protocol for Perl 5.

Class::Meta::Express is a Perl module for concise, expressive creation of Class::Meta classes.

Class::Meta is a Perl class automation, introspection, and data validation.

Class::Meta::Type is a Perl module for data type validation and accessor building.

Object::Relation::Meta::Class::Schema is a Perl module for Object::Relation database store builder.
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