http://dev.clojure.org/jira This file is an XML representation of an issue en-us 4.4 649 25-07-2011 http://dev.clojure.org/jira/browse/CLJ-966 Clojure <p>The attached patch adds support to marker protocols, for example</p> <p>(defprotocol Sequential<br/> "marker protocol indicating a sequential type")</p> CLJ-966

Add support for marker protocols

Enhancement Minor Closed Completed Unassigned Nicola Mometto Thu, 5 Apr 2012 07:16:52 -0500 Sat, 18 Aug 2012 07:50:41 -0500 Sat, 18 Aug 2012 07:50:41 -0500 Release 1.5 2 1 <p>Marker protocols are supported and used in ClojureScript.</p> <p>what are the uses for marker protocols? I know there are marker interfaces in java, but is it a pattern we want to carry forward?</p> <p>Nice and simple. Tested with:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>(defprotocol P (hi [_])) (defprotocol M) (deftype T [a] M P (hi [_] "hi there")) (satisfies? P (T. 1)) (satisfies? M (T. 1)) (hi (T. 1)) (defprotocol M2 "marker for 2") (extend-type T M2) (satisfies? M2 (T. 1)) </pre> </div></div> <p>Similar tests are included in the additional patch file as test cases. This additional patch file should be applied after the feature's main patch file.</p> Approval Ok Global Rank Patch Code and Test