Raymond Wiker <rwi...@gmail.com> writes: > On Jun 14, 2011, at 19:30 , Martin Simmons wrote: > >>>>>>> On Tue, 14 Jun 2011 09:32:50 -0400, Daniel Weinreb said: >>> >>> But Fare pointed out to me that being able to add generic functions >>> specialized on these would be a good thing. This would mean making them use >>> CLOS not for encapsulation but for genericty. >> >> Use can specialize methods on defstruct classes too, so they don't have to be >> CLOS instances defined with defclass. > > Built-in classes too[1], which means that you can have methods > specialized on (e.g.) single-float and double-float, fixnum and > bignum, list and vector, etc.
Well, only if those types also happen to have a corresponding implementation-specific class. SINGLE-FLOAT, DOUBLE-FLOAT, FIXNUM, and BIGNUM are specified as types. LIST and VECTOR are system classes. FLOAT is also a system class. I recently ran into some accidentally unportable code that specialized a method argument on DOUBLE-FLOAT. It worked in SBCL but failed in CLISP because CLISP provides no DOUBLE-FLOAT class. Zach _______________________________________________ pro mailing list pro@common-lisp.net http://lists.common-lisp.net/cgi-bin/mailman/listinfo/pro
