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-827 Clojure <p>Add a clojure equivalent of &gt;&gt;&gt;.</p> <p>A simple version of this is implemented here (<a href="https://github.com/joegallo/clojure/tree/unsigned-bit-shift-right">https://github.com/joegallo/clojure/tree/unsigned-bit-shift-right</a>), and just follows the example set by shift-right.</p> <p>The downside of this implementation is that it treats all integer types as longs, and shifts them accordingly, which yields different results than you would get in java. A previous version of this did not have the same problem, when BitOps was its own thing. I'm not sure if this limitation is acceptable and appropriate, or needs to be worked around (my inclination is the latter).</p> CLJ-827

unsigned-bit-shift-right

Enhancement Major Open Unresolved Unassigned Joe Gallo Tue, 9 Aug 2011 11:42:09 -0500 Fri, 12 Apr 2013 09:52:24 -0500 Release 1.6 12 3 <p>I just realized (with the asssistance of Paul Stadig) that just doing only longs is probably sufficient, as you can get the integer version if you really want it: </p> <p>&gt; (int (bit-and Integer/MAX_VALUE (unsigned-bit-shift-right -5 1)))<br/> 2147483645 </p> <p>Of course, that's less efficient than just doing it directly with java, but it's enough that I think my concern from the previous comment is addressed.</p> <p>I have attached "0001-<a href="http://dev.clojure.org/jira/browse/CLJ-827" title="unsigned-bit-shift-right">CLJ-827</a>-Add-bit-shift-right-logical.patch", which implements a logical bit-shift-right using the same JVM bytecode as &gt;&gt;&gt;.</p> <p>The patch mimics the implementations of &lt;&lt; and &gt;&gt;.</p> <p>For context, this feature appears to be needed for Clojure-in-Clojure data structures: <a href="https://groups.google.com/d/msg/clojure-dev/iAwH7CLSFzE/6wzDH4RS1YQJ">https://groups.google.com/d/msg/clojure-dev/iAwH7CLSFzE/6wzDH4RS1YQJ</a></p> <p>Just wanted to note that I've introduced this operation to ClojureScript when implementing PersistentHashMap. The name over there is bit-shift-right-zero-fill. Would it be alright for Clojure to use that name? Failing that, ClojureScript would probably have to change to match.</p> Approval Vetted Global Rank Patch Code