[CLJ-910] [Patch] Allow for type-hinting the method receiver in memfn

Sat, 1 Sep 2012 08:37:48 -0500

The attached patch copies metadata given to the method name symbol of memfn to the method receiver in the expansion. That way, memfn is able to be used even for type-hinted calls resulting in a big performance win.

user> (time (dotimes [i 1000000] ((memfn intValue) 1)))
Reflection warning, NO_SOURCE_FILE:1 - call to intValue can't be resolved.
"Elapsed time: 2579.229115 msecs"
nil
user> (time (dotimes [i 1000000] ((memfn ^Number intValue) 1)))
"Elapsed time: 12.015235 msecs"
nil

Clojure JIRA

[CLJ-910] [Patch] Allow for type-hinting the method receiver in memfn