MakeMethods::Composite::Universal(3pm)			User Contributed Perl Documentation		    MakeMethods::Composite::Universal(3pm)

NAME

       Class::MakeMethods::Composite::Universal - Composite Method Tricks

SYNOPSIS

	 Class::MakeMethods::Composite::Universal->make_patch(
	   -TargetClass => 'SomeClass::OverYonder',
	   name => 'foo',
	   pre_rules => [
	     sub {
	       my $method = pop;
	       warn "Arguments for foo:", @_
	     }
	   ]
	   post_rules => [
	     sub {
	       warn "Result of foo:", Class::MakeMethods::Composite->CurrentResults
	     }
	   ]
	 );

DESCRIPTION

       The Composite::Universal suclass of MakeMethods provides some generally-applicable types of methods based on Class::MakeMethods::Composite.

METHOD GENERATOR TYPES

   patch
       The patch ruleset generates composites whose core behavior is based on an existing subroutine.

       Here's a sample usage:

	 sub foo {
	   my $count = shift;
	   return 'foo' x $count;
	 }

	 Class::MakeMethods::Composite::Universal->make(
	   -ForceInstall => 1,
	   patch => {
	     name => 'foo',
	     pre_rules => [
	       sub {
		 my $method = pop @_;
		 if ( ! scalar @_ ) {
		   @{ $method->{args} } = ( 2 );
		 }
	       },
	       sub {
		 my $method = pop @_;
		 my $count = shift;
		 if ( $count > 99 ) {
		   Carp::confess "Won't foo '$count' -- that's too many!"
		 }
	       },
	     ],
	     post_rules => [
	       sub {
		 my $method = pop @_;
		 if ( ref $method->{result} eq 'SCALAR' ) {
		   ${ $method->{result} } =~ s/oof/oozle-f/g;
		 } elsif ( ref $method->{result} eq 'ARRAY' ) {
		   map { s/oof/oozle-f/g } @{ $method->{result} };
		 }
	       }
	     ],
	   },
	 );

   make_patch
       A convenient wrapper for "make()" and the "patch" method generator.

       Provides the '-ForceInstall' flag, which is required to ensure that the patched subroutine replaces the original.

       For example, one could add logging to an existing method as follows:

	 Class::MakeMethods::Composite::Universal->make_patch(
	   -TargetClass => 'SomeClass::OverYonder',
	   name => 'foo',
	   pre_rules => [
	     sub {
	       my $method = pop;
	       warn "Arguments for foo:", @_
	     }
	   ]
	   post_rules => [
	     sub {
	       warn "Result of foo:", Class::MakeMethods::Composite->CurrentResults
	     }
	   ]
	 );

SEE ALSO

       See Class::MakeMethods for general information about this distribution.

       See Class::MakeMethods::Composite for more about this family of subclasses.

perl v5.10.1							    2004-09-06				    MakeMethods::Composite::Universal(3pm)