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--- rfc:traits [2009/01/18 17:03] – Updated syntax according to the patch gron
+++ rfc:traits [2012/01/30 08:27] – Make the outdated note bold, and move it away from the headline where it keeps being unnoticed gron
@@ Line 1: / Line 1: @@
-====== Request for Comments: Traits for PHP ======
+====== Request for Comments: Traits for PHP (Superseded by Horizontal Reuse for PHP) ======
-This RFC is outdated and replaced by [[rfc:HorizontalReuse|RFC: Horizontal Reuse for PHP]].
   * Version: 1.5
   * Date: 2008-03-06
   * Author: Stefan Marr <php.at.stefan-marr.de>
-  * Status: Patch available, Superseded by [[rfc:HorizontalReuse|Horizontal Reuse for PHP]]
+  * Status: **Superseded by [[rfc:HorizontalReuse|Horizontal Reuse for PHP]]**
   * Patch: http://www.stefan-marr.de/archives/20-New-Traits-Patch-Ready-for-Testing.html
   * First Published at: http://www.stefan-marr.de/artikel/rfc-traits-for-php.html
@@ Line 16: / Line 15: @@
 additional resources about Traits are given.
+**This RFC is outdated and replaced by [[rfc:HorizontalReuse|RFC: Horizontal Reuse for PHP]].**
 ===== Introduction =====
@@ Line 504: / Line 504: @@
 This section collects proposals for alternative Traits syntaxes.
+==== Scala Synthax and practical example ====
+This is inpired from [[http://www.scala-lang.org/node/117]].
+<code php>
+trait User_Comments
+{
+     function addComment($c)
+     {
+           $db = App::getDb();
+           $db->Execute("INSERT INTO user_comments (type, type_id, user_id, text)VALUES ($c->type, $c->type_id, $c->uid, $c->text)");
+     }
+     function getComments($filter)
+     {
+           return array();
+     }
+     function removeComment($id)
+     {
+           $db = App::getDb();
+           $db->Execute("DELETE FROM user_comments ... ");
+     }
+}
+class App_Email with User_Comments {}
+class App_Document with User_Comments  {
+     function removeComment($id)
+     {
+           $db = App::getDb();
+           $db->Execute("DELETE FROM user_comments ... ");
+           $db->Execute("UPDATE app_documents SET comments_count = ... ");
+     }
+}
+// PHP notice : 'User_Comments::removeComment() definition skipped in App_Document'
+$doc = new App_Document;
+echo is_a($doc, 'App_Document');     // true
+echo is_a($doc, 'User_Comments');    // false
+echo is_with($doc, 'User_Comments'); // true
+</code>
+We deal with conflicting class definitions by simply ignoring them.
+<code php>
+trait Conflict_Comments
+{
+     function removeComment($id)
+     {
+           return false;
+     }
+}
+class App_Document_Conflict with User_Comments, Conflict_Comments  {
+     function removeComment($id)
+     {
+           $db = App::getDb();
+           $db->Execute("DELETE FROM user_comments ... ");
+           $db->Execute("UPDATE app_documents SET comments_count = ... ");
+     }
+}
+// PHP notice : 'User_Comments::removeComment() definition skipped in App_Document_Conflict'
+// PHP notice : 'Conflict_Comments::removeComment() definition skipped in App_Document_Conflict'
+$doc = new App_Document_Conflict;
+echo is_a($doc, 'App_Document_Conflict');// true
+echo is_with($doc, 'User_Comments');     // true
+echo is_with($doc, 'Conflict_Comments'); // true
+</code>
 === Alternative Keywords for use ===

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