Metaclass->add_method

[gitmo/Mouse.git] / lib / Mouse.pm

diff --git a/lib/Mouse.pm b/lib/Mouse.pm
index ae3a0b7..2df3ba1 100644 (file)
--- a/lib/Mouse.pm
+++ b/lib/Mouse.pm
@@ -68,6 +68,20 @@ do {
         around => sub {
             return \&Class::Method::Modifiers::around;
         },
+
+        with => sub {
+            my $caller = $CALLER;
+
+            return sub {
+                my $role  = shift;
+                my $class = $caller->meta;
+
+                confess "Mouse::Role only supports 'with' on individual roles at a time" if @_;
+
+                Mouse::load_class($role);
+                $role->meta->apply($class);
+            };
+        },
     );
 
     my $exporter = Sub::Exporter::build_exporter({
@@ -322,11 +336,20 @@ L</handles>, such as regular expression and coderef, are not yet supported.
 
 Lets you automatically weaken any reference stored in the attribute.
 
-=item trigger => Coderef
+=item trigger => CodeRef | HashRef
+
+Triggers are like method modifiers for setting attribute values. You can have
+a "before" and an "after" trigger, each of which receive as arguments the instance, the new value, and the attribute metaclass. Historically, triggers have
+only been "after" modifiers, so if you use a coderef for the C<trigger> option,
+it will maintain that compatibility. Like method modifiers, you can't really
+affect the act of setting the attribute value, and the return values of the 
+modifiers are ignored.
 
-Any time the attribute's value is set (either through the accessor or the
-constructor), the trigger is called on it. The trigger receives as arguments
-the instance, the new value, and the attribute instance.
+There's also an "around" trigger which you can use to change the value that
+is being set on the attribute, or even prevent the attribute from being
+updated. The around trigger receives as arguments a code reference to invoke
+to set the attribute's value (which expects as arguments the instance and
+the new value), the instance, the new value, and the attribute metaclass.
 
 =item builder => Str