NAME

       Kavorka::Manual::MethodModifiers - before/after/around keywords

DESCRIPTION

       Kavorka provides the "before", "after" and "around" keywords for method modifiers.

       Method modifiers should work in Moose, Moo, Mouse and Role::Tiny classes and roles. In
       other classes they will fall back to using Class::Method::Modifiers.

       The keywords "augment" and "override" are also available, but will only work in classes
       backed by a framework that supports these modifiers (i.e. Moose or Mouse, but not Moo).

       The anatomy of a method modifier:

       1.  The keyword introducing the method.

       2.  The method names.

       3.  The signature (optional).

       4.  Traits (optional).

       5.  The prototype (optional).

       6.  The attribute list (optional).

       7.  The modifier body.

       Example:

          #  (1)   (2)    (3)    (4)     (5)  (6)     (7)
             after foobar ($foo) is cool :($) :cached { $self->log("foobar $foo") }

   The Keyword
       By default, these keywords are exported. They must be exported by request:

          use Kavorka qw( before after around );
          use Kavorka qw( -modifiers );

   The Method Names
       These are the names of the methods being wrapped.

       Multiple names may be separated by colons:

          after foo, bar, baz { ... }

   The Signature
       See Kavorka::Manual::Signatures.

       The "before" and "after" keywords have a default invocant called $self, but it does not
       have a type constraint, so can equally be used for class or object methods.

       The "around" modifier defines two invocants called $next and $self. ("${^NEXT}" is also
       available as an alias for $next for backwards compatibility with Moops::MethodModifiers.)

       Beware using type constraints for method modifiers (which are essentially wrappers);
       constraints will be checked at each level of wrapping which will slow down method calls.

   Traits
       See Kavorka::Manual::ExtendingKavorka.

   The Prototype
       See Kavorka::Manual::PrototypeAndAttributes.

       Note however that prototypes are fairly useless for methods.

   The Attributes
       Attributes may alternatively be provided before the signature.

       See Kavorka::Manual::PrototypeAndAttributes.

       Note that this applies the attribute to the modifier code, and not to the method being
       modified.

   The Modifier Body
       This is more or less what you'd expect from the modifier body you'd write with Moose,
       however the lexical variables for parameters are pre-declared and pre-populated, and
       invocants have been shifted off @_.

BUGS

       Please report any bugs to <http://rt.cpan.org/Dist/Display.html?Queue=Kavorka>.

SEE ALSO

       Kavorka::Manual, Kavorka::Manual::Signatures, Kavorka::Manual::PrototypeAndAttributes,
       Kavorka::Manual::Methods.

AUTHOR

       Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

       This software is copyright (c) 2013-2014 by Toby Inkster.

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

DISCLAIMER OF WARRANTIES

       THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
       WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
       PURPOSE.