.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.16) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" Moo \- Minimalist Object Orientation (with Moose compatiblity) .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& package Cat::Food; \& \& use Moo; \& use Sub::Quote; \& \& sub feed_lion { \& my $self = shift; \& my $amount = shift || 1; \& \& $self\->pounds( $self\->pounds \- $amount ); \& } \& \& has taste => ( \& is => \*(Aqro\*(Aq, \& ); \& \& has brand => ( \& is => \*(Aqro\*(Aq, \& isa => sub { \& die "Only SWEET\-TREATZ supported!" unless $_[0] eq \*(AqSWEET\-TREATZ\*(Aq \& }, \&); \& \& has pounds => ( \& is => \*(Aqrw\*(Aq, \& isa => quote_sub q{ die "$_[0] is too much cat food!" unless $_[0] < 15 }, \& ); \& \& 1; .Ve .PP and else where .PP .Vb 5 \& my $full = Cat::Food\->new( \& taste => \*(AqDELICIOUS.\*(Aq, \& brand => \*(AqSWEET\-TREATZ\*(Aq, \& pounds => 10, \& ); \& \& $full\->feed_lion; \& \& say $full\->pounds; .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" This module is an extremely light-weight, high-performance Moose replacement. It also avoids depending on any \s-1XS\s0 modules to allow simple deployments. The name \f(CW\*(C`Moo\*(C'\fR is based on the idea that it provides almost \-but not quite\- two thirds of Moose. .PP Unlike \f(CW\*(C`Mouse\*(C'\fR this module does not aim at full Moose compatibility. See \&\*(L"\s-1INCOMPATIBILITIES\s0\*(R" for more details. .SH "WHY MOO EXISTS" .IX Header "WHY MOO EXISTS" If you want a full object system with a rich Metaprotocol, Moose is already wonderful. .PP I've tried several times to use Mouse but it's 3x the size of Moo and takes longer to load than most of my Moo based \s-1CGI\s0 scripts take to run. .PP If you don't want Moose, you don't want \*(L"less metaprotocol\*(R" like Mouse, you want \*(L"as little as possible\*(R" \- which means \*(L"no metaprotocol\*(R", which is what Moo provides. .PP By Moo 1.0 I intend to have Moo's equivalent of Any::Moose built in \- if Moose gets loaded, any Moo class or role will act as a Moose equivalent if treated as such. .PP Hence \- Moo exists as its name \- Minimal Object Orientation \- with a pledge to make it smooth to upgrade to Moose when you need more than minimal features. .SH "Moo and Moose \- NEW, EXPERIMENTAL" .IX Header "Moo and Moose - NEW, EXPERIMENTAL" If Moo detects Moose being loaded, it will automatically register metaclasses for your Moo and Moo::Role packages, so you should be able to use them in Moose code without it ever realising you aren't using Moose everywhere. .PP Extending a Moose class or consuming a Moose::Role should also work. .PP So should extending a Mouse class or consuming a Mouse::Role. .PP This means that there is no need for anything like Any::Moose for Moo code \- Moo and Moose code should simply interoperate without problem. To handle Mouse code, you'll likely need an empty Moo role or class consuming or extending the Mouse stuff since it doesn't register true Moose metaclasses like we do. .PP However, these features are new as of 0.91.0 (0.091000) so while serviceable, they are absolutely certain to not be 100% yet; please do report bugs. .PP If you need to disable the metaclass creation, add: .PP .Vb 1 \& no Moo::sification; .Ve .PP to your code before Moose is loaded, but bear in mind that this switch is currently global and turns the mechanism off entirely, so don't put this in library code, only in a top level script as a temporary measure while you send a bug report. .SH "IMPORTED METHODS" .IX Header "IMPORTED METHODS" .SS "new" .IX Subsection "new" .Vb 1 \& Foo::Bar\->new( attr1 => 3 ); .Ve .PP or .PP .Vb 1 \& Foo::Bar\->new({ attr1 => 3 }); .Ve .SS "\s-1BUILDARGS\s0" .IX Subsection "BUILDARGS" .Vb 2 \& sub BUILDARGS { \& my ( $class, @args ) = @_; \& \& unshift @args, "attr1" if @args % 2 == 1; \& \& return { @args }; \& }; \& \& Foo::Bar\->new( 3 ); .Ve .PP The default implementation of this method accepts a hash or hash reference of named parameters. If it receives a single argument that isn't a hash reference it throws an error. .PP You can override this method in your class to handle other types of options passed to the constructor. .PP This method should always return a hash reference of named options. .SS "\s-1BUILD\s0" .IX Subsection "BUILD" Define a \f(CW\*(C`BUILD\*(C'\fR method on your class and the constructor will automatically call the \f(CW\*(C`BUILD\*(C'\fR method from parent down to child after the object has been instantiated. Typically this is used for object validation or possibly logging. .SS "\s-1DEMOLISH\s0" .IX Subsection "DEMOLISH" If you have a \f(CW\*(C`DEMOLISH\*(C'\fR method anywhere in your inheritance hierarchy, a \f(CW\*(C`DESTROY\*(C'\fR method is created on first object construction which will call \&\f(CW\*(C`$instance\->DEMOLISH($in_global_destruction)\*(C'\fR for each \f(CW\*(C`DEMOLISH\*(C'\fR method from child upwards to parents. .PP Note that the \f(CW\*(C`DESTROY\*(C'\fR method is created on first construction of an object of your class in order to not add overhead to classes without \f(CW\*(C`DEMOLISH\*(C'\fR methods; this may prove slightly surprising if you try and define your own. .SS "does" .IX Subsection "does" .Vb 3 \& if ($foo\->does(\*(AqSome::Role1\*(Aq)) { \& ... \& } .Ve .PP Returns true if the object composes in the passed role. .SH "IMPORTED SUBROUTINES" .IX Header "IMPORTED SUBROUTINES" .SS "extends" .IX Subsection "extends" .Vb 1 \& extends \*(AqParent::Class\*(Aq; .Ve .PP Declares base class. Multiple superclasses can be passed for multiple inheritance (but please use roles instead). .PP Calling extends more than once will \s-1REPLACE\s0 your superclasses, not add to them like 'use base' would. .SS "with" .IX Subsection "with" .Vb 1 \& with \*(AqSome::Role1\*(Aq; .Ve .PP or .PP .Vb 1 \& with \*(AqSome::Role1\*(Aq, \*(AqSome::Role2\*(Aq; .Ve .PP Composes one or more Moo::Role (or Role::Tiny) roles into the current class. An error will be raised if these roles have conflicting methods. .SS "has" .IX Subsection "has" .Vb 3 \& has attr => ( \& is => \*(Aqro\*(Aq, \& ); .Ve .PP Declares an attribute for the class. .PP The options for \f(CW\*(C`has\*(C'\fR are as follows: .IP "\(bu" 2 is .Sp \&\fBrequired\fR, may be \f(CW\*(C`ro\*(C'\fR, \f(CW\*(C`lazy\*(C'\fR, \f(CW\*(C`rwp\*(C'\fR or \f(CW\*(C`rw\*(C'\fR. .Sp \&\f(CW\*(C`ro\*(C'\fR generates an accessor that dies if you attempt to write to it \- i.e. a getter only \- by defaulting \f(CW\*(C`reader\*(C'\fR to the name of the attribute. .Sp \&\f(CW\*(C`lazy\*(C'\fR generates a reader like \f(CW\*(C`ro\*(C'\fR, but also sets \f(CW\*(C`lazy\*(C'\fR to 1 and \&\f(CW\*(C`builder\*(C'\fR to \f(CW\*(C`_build_${attribute_name}\*(C'\fR to allow on-demand generated attributes. This feature was my attempt to fix my incompetence when originally designing \f(CW\*(C`lazy_build\*(C'\fR, and is also implemented by MooseX::AttributeShortcuts. .Sp \&\f(CW\*(C`rwp\*(C'\fR generates a reader like \f(CW\*(C`ro\*(C'\fR, but also sets \f(CW\*(C`writer\*(C'\fR to \&\f(CW\*(C`_set_${attribute_name}\*(C'\fR for attributes that are designed to be written from inside of the class, but read-only from outside. This feature comes from MooseX::AttributeShortcuts. .Sp \&\f(CW\*(C`rw\*(C'\fR generates a normal getter/setter by defaulting \f(CW\*(C`accessor\*(C'\fR to the name of the attribute. .IP "\(bu" 2 isa .Sp Takes a coderef which is meant to validate the attribute. Unlike Moose Moo does not include a basic type system, so instead of doing \f(CW\*(C`isa => \*(AqNum\*(Aq\*(C'\fR, one should do .Sp .Vb 3 \& isa => quote_sub q{ \& die "$_[0] is not a number!" unless looks_like_number $_[0] \& }, .Ve .Sp Sub::Quote aware .Sp Since Moo does \fBnot\fR run the \f(CW\*(C`isa\*(C'\fR check before \f(CW\*(C`coerce\*(C'\fR if a coercion subroutine has been supplied, \f(CW\*(C`isa\*(C'\fR checks are not structural to your code and can, if desired, be omitted on non-debug builds (although if this results in an uncaught bug causing your program to break, the Moo authors guarantee nothing except that you get to keep both halves). .Sp If you want MooseX::Types style named types, look at MooX::Types::MooseLike. .Sp To cause your \f(CW\*(C`isa\*(C'\fR entries to be automatically mapped to named Moose::Meta::TypeConstraint objects (rather than the default behaviour of creating an anonymous type), set: .Sp .Vb 4 \& $Moo::HandleMoose::TYPE_MAP{$isa_coderef} = sub { \& require MooseX::Types::Something; \& return MooseX::Types::Something::TypeName(); \& }; .Ve .Sp Note that this example is purely illustrative; anything that returns a Moose::Meta::TypeConstraint object or something similar enough to it to make Moose happy is fine. .IP "\(bu" 2 coerce .Sp Takes a coderef which is meant to coerce the attribute. The basic idea is to do something like the following: .Sp .Vb 3 \& coerce => quote_sub q{ \& $_[0] + 1 unless $_[0] % 2 \& }, .Ve .Sp Note that Moo will always fire your coercion \- this is to permit isa entries to be used purely for bug trapping, whereas coercions are always structural to your code. We do, however, apply any supplied \f(CW\*(C`isa\*(C'\fR check after the coercion has run to ensure that it returned a valid value. .Sp Sub::Quote aware .IP "\(bu" 2 handles .Sp Takes a string .Sp .Vb 1 \& handles => \*(AqRobotRole\*(Aq .Ve .Sp Where \f(CW\*(C`RobotRole\*(C'\fR is a role (Moo::Role) that defines an interface which becomes the list of methods to handle. .Sp Takes a list of methods .Sp .Vb 1 \& handles => [ qw( one two ) ] .Ve .Sp Takes a hashref .Sp .Vb 3 \& handles => { \& un => \*(Aqone\*(Aq, \& } .Ve .IP "\(bu" 2 trigger .Sp Takes a coderef which will get called any time the attribute is set. This includes the constructor. Coderef will be invoked against the object with the new value as an argument. .Sp If you set this to just \f(CW1\fR, it generates a trigger which calls the \&\f(CW\*(C`_trigger_${attr_name}\*(C'\fR method on \f(CW$self\fR. This feature comes from MooseX::AttributeShortcuts. .Sp Note that Moose also passes the old value, if any; this feature is not yet supported. .Sp Sub::Quote aware .IP "\(bu" 2 default .Sp Takes a coderef which will get called with \f(CW$self\fR as its only argument to populate an attribute if no value is supplied to the constructor \- or if the attribute is lazy, when the attribute is first retrieved if no value has yet been provided. .Sp Note that if your default is fired during \fInew()\fR there is no guarantee that other attributes have been populated yet so you should not rely on their existence. .Sp Sub::Quote aware .IP "\(bu" 2 predicate .Sp Takes a method name which will return true if an attribute has a value. .Sp If you set this to just \f(CW1\fR, the predicate is automatically named \&\f(CW\*(C`has_${attr_name}\*(C'\fR if your attribute's name does not start with an underscore, or <_has_${attr_name_without_the_underscore}> if it does. This feature comes from MooseX::AttributeShortcuts. .IP "\(bu" 2 builder .Sp Takes a method name which will be called to create the attribute \- functions exactly like default except that instead of calling .Sp .Vb 1 \& $default\->($self); .Ve .Sp Moo will call .Sp .Vb 1 \& $self\->$builder; .Ve .Sp If you set this to just \f(CW1\fR, the predicate is automatically named \&\f(CW\*(C`_build_${attr_name}\*(C'\fR. This feature comes from MooseX::AttributeShortcuts. .IP "\(bu" 2 clearer .Sp Takes a method name which will clear the attribute. .Sp If you set this to just \f(CW1\fR, the clearer is automatically named \&\f(CW\*(C`clear_${attr_name}\*(C'\fR if your attribute's name does not start with an underscore, or <_clear_${attr_name_without_the_underscore}> if it does. This feature comes from MooseX::AttributeShortcuts. .IP "\(bu" 2 lazy .Sp \&\fBBoolean\fR. Set this if you want values for the attribute to be grabbed lazily. This is usually a good idea if you have a \*(L"builder\*(R" which requires another attribute to be set. .IP "\(bu" 2 required .Sp \&\fBBoolean\fR. Set this if the attribute must be passed on instantiation. .IP "\(bu" 2 reader .Sp The value of this attribute will be the name of the method to get the value of the attribute. If you like Java style methods, you might set this to \&\f(CW\*(C`get_foo\*(C'\fR .IP "\(bu" 2 writer .Sp The value of this attribute will be the name of the method to set the value of the attribute. If you like Java style methods, you might set this to \&\f(CW\*(C`set_foo\*(C'\fR .IP "\(bu" 2 weak_ref .Sp \&\fBBoolean\fR. Set this if you want the reference that the attribute contains to be weakened; use this when circular references are possible, which will cause leaks. .IP "\(bu" 2 init_arg .Sp Takes the name of the key to look for at instantiation time of the object. A common use of this is to make an underscored attribute have a non-underscored initialization name. \f(CW\*(C`undef\*(C'\fR means that passing the value in on instantiation is ignored. .SS "before" .IX Subsection "before" .Vb 1 \& before foo => sub { ... }; .Ve .PP See \*(L"before method(s) => sub { ... }\*(R" in Class::Method::Modifiers for full documentation. .SS "around" .IX Subsection "around" .Vb 1 \& around foo => sub { ... }; .Ve .PP See \*(L"around method(s) => sub { ... }\*(R" in Class::Method::Modifiers for full documentation. .SS "after" .IX Subsection "after" .Vb 1 \& after foo => sub { ... }; .Ve .PP See \*(L"after method(s) => sub { ... }\*(R" in Class::Method::Modifiers for full documentation. .SH "SUB QUOTE AWARE" .IX Header "SUB QUOTE AWARE" \&\*(L"quote_sub\*(R" in Sub::Quote allows us to create coderefs that are \*(L"inlineable,\*(R" giving us a handy, XS-free speed boost. Any option that is Sub::Quote aware can take advantage of this. .SH "INCOMPATIBILITIES WITH MOOSE" .IX Header "INCOMPATIBILITIES WITH MOOSE" There is no built in type system. \f(CW\*(C`isa\*(C'\fR is verified with a coderef, if you need complex types, just make a library of coderefs, or better yet, functions that return quoted subs. MooX::Types::MooseLike provides a similar \s-1API\s0 to MooseX::Types::Moose so that you can write .PP .Vb 1 \& has days_to_live => (is => \*(Aqro\*(Aq, isa => Int); .Ve .PP and have it work with both; it is hoped that providing only subrefs as an \&\s-1API\s0 will encourage the use of other type systems as well, since it's probably the weakest part of Moose design-wise. .PP \&\f(CW\*(C`initializer\*(C'\fR is not supported in core since the author considers it to be a bad idea but may be supported by an extension in future. Meanwhile \f(CW\*(C`trigger\*(C'\fR or \&\f(CW\*(C`coerce\*(C'\fR are more likely to be able to fulfill your needs. .PP There is no meta object. If you need this level of complexity you wanted Moose \- Moo succeeds at being small because it explicitly does not provide a metaprotocol. However, if you load Moose, then .PP .Vb 1 \& Class::MOP::class_of($moo_class_or_role) .Ve .PP will return an appropriate metaclass pre-populated by Moo. .PP No support for \f(CW\*(C`super\*(C'\fR, \f(CW\*(C`override\*(C'\fR, \f(CW\*(C`inner\*(C'\fR, or \f(CW\*(C`augment\*(C'\fR \- the author considers augment to be a bad idea, and override can be translated: .PP .Vb 5 \& override foo => sub { \& ... \& super(); \& ... \& }; \& \& around foo => sub { \& my ($orig, $self) = (shift, shift); \& ... \& $self\->$orig(@_); \& ... \& }; .Ve .PP The \f(CW\*(C`dump\*(C'\fR method is not provided by default. The author suggests loading Devel::Dwarn into \f(CW\*(C`main::\*(C'\fR (via \f(CW\*(C`perl \-MDevel::Dwarn ...\*(C'\fR for example) and using \f(CW\*(C`$obj\->$::Dwarn()\*(C'\fR instead. .PP \&\*(L"default\*(R" only supports coderefs, because doing otherwise is usually a mistake anyway. .PP \&\f(CW\*(C`lazy_build\*(C'\fR is not supported; you are instead encouraged to use the \&\f(CW\*(C`is =\*(C'\fR 'lazy'> option supported by Moo and MooseX::AttributeShortcuts. .PP \&\f(CW\*(C`auto_deref\*(C'\fR is not supported since the author considers it a bad idea. .PP \&\f(CW\*(C`documentation\*(C'\fR will show up in a Moose metaclass created from your class but is otherwise ignored. Then again, Moose ignores it as well, so this is arguably not an incompatibility. .PP Since \f(CW\*(C`coerce\*(C'\fR does not require \f(CW\*(C`isa\*(C'\fR to be defined but Moose does require it, the metaclass inflation for coerce-alone is a trifle insane and if you attempt to subtype the result will almost certainly break. .PP Handling of warnings: when you \f(CW\*(C`use Moo\*(C'\fR we enable \s-1FATAL\s0 warnings. The nearest similar invocation for Moose would be: .PP .Vb 2 \& use Moose; \& use warnings FATAL => "all"; .Ve .PP Additionally, Moo supports a set of attribute option shortcuts intended to reduce common boilerplate. The set of shortcuts is the same as in the Moose module MooseX::AttributeShortcuts as of its version 0.009+. So if you: .PP .Vb 2 \& package MyClass; \& use Moo; .Ve .PP The nearest Moose invocation would be: .PP .Vb 1 \& package MyClass; \& \& use Moose; \& use warnings FATAL => "all"; \& use MooseX::AttributeShortcuts; .Ve .PP or, if you're inheriting from a non-Moose class, .PP .Vb 1 \& package MyClass; \& \& use Moose; \& use MooseX::NonMoose; \& use warnings FATAL => "all"; \& use MooseX::AttributeShortcuts; .Ve .PP Finally, Moose requires you to call .PP .Vb 1 \& _\|_PACKAGE_\|_\->meta\->make_immutable; .Ve .PP at the end of your class to get an inlined (i.e. not horribly slow) constructor. Moo does it automatically the first time \->new is called on your class. .SH "SUPPORT" .IX Header "SUPPORT" Users' \s-1IRC:\s0 #moose on irc.perl.org .PP Development and contribution \s-1IRC:\s0 #web\-simple on irc.perl.org .SH "AUTHOR" .IX Header "AUTHOR" mst \- Matt S. Trout (cpan:MSTROUT) .SH "CONTRIBUTORS" .IX Header "CONTRIBUTORS" dg \- David Leadbeater (cpan:DGL) .PP frew \- Arthur Axel \*(L"fREW\*(R" Schmidt (cpan:FREW) .PP hobbs \- Andrew Rodland (cpan:ARODLAND) .PP jnap \- John Napiorkowski (cpan:JJNAPIORK) .PP ribasushi \- Peter Rabbitson (cpan:RIBASUSHI) .PP chip \- Chip Salzenberg (cpan:CHIPS) .PP ajgb \- Alex J. G. BurzyXski (cpan:AJGB) .PP doy \- Jesse Luehrs (cpan:DOY) .PP perigrin \- Chris Prather (cpan:PERIGRIN) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright (c) 2010\-2011 the Moo \*(L"\s-1AUTHOR\s0\*(R" and \*(L"\s-1CONTRIBUTORS\s0\*(R" as listed above. .SH "LICENSE" .IX Header "LICENSE" This library is free software and may be distributed under the same terms as perl itself.