>>>>> On Wed, 02 Mar 2011 07:48:34 +0100, Kazimir Majorinc said: > > ------------------- > reader macro n. 1. a textual notation introduced by dispatch on one or > two characters that defines special-purpose syntax for use by the Lisp > reader, and that is implemented by a reader macro function. See Section > 2.2 (Reader Algorithm). 2. the character or characters that introduce a > reader macro[1]; that is, a macro character or the conceptual pairing of > a dispatching macro character and the character that follows it. (A > reader macro is not a kind of macro.) > ------------------- > > I do not understand item 1. In code > > ... > (set-macro-character #\G (lambda(s c) 9.81)) > (setf s (* (/ G 2) (* tt tt))) > > #\G is the reader-macro in a sense 2. What is the reader-macro in > a sense 1.?
There is no difference in that simple case, but consider the standard Sharpsign X case: #X123 is the reader macro in sense 1 #X is the reader macro in sense 2 I.e. sense 2 describes the characters that the built-in reader algorithm processes and sense 1 contains those characters plus anything that the reader macro function reads. -- Martin Simmons LispWorks Ltd http://www.lispworks.com/ _______________________________________________ pro mailing list [email protected] http://common-lisp.net/cgi-bin/mailman/listinfo/pro
