cl-anonfun is a Common Lisp library that provides a simple anonymous function notation.
fn form => lambda-form
fn macro returns lambda form of anonymous function form. If special symbols starting with % are found in form, its symbols will be placed to lambda-list of lambda form. Special symbol % represents its first argument. Special symbol formed %<n> represents its n'th argument. Special symbol %& represents its rest of arguments.
(macroexpand '(fn (* % %)))
; => #'(LAMBDA (%) (* % %))
(funcall (fn (* % %)) 3)
; => 9
(macroexpand '(fn (mapcar %2 %1)))
; => #'(LAMBDA (%1 %2) (MAPCAR %2 %1))
(funcall (fn (mapcar %2 %1)) '(1 2 3) (fn (* % %)))
; => 1 4 9
(macroexpand '(fn (apply #'+ 1 2 3 %&)))
; => #'(LAMBDA (&REST %&) (APPLY #'+ 1 2 3 %&))
(funcall (fn (apply #'+ 1 2 3 %&)) 4 5)
; => 15
fnn narg form => lambda-form
Like fn except that fnn macro can take the number of arguments of the anonymous function.
(macroexpand '(fnn 3 (eq %2 1)))
; => #'(LAMBDA (#:IGNORE_1_846 %2 #:IGNORE_3_847)
(DECLARE (IGNORE #:IGNORE_1_846 #:IGNORE_3_847))
(EQ %2 1))
(funcall (fnn 3 (eq %2 1)) 3 1 2)
; => T
enable-fn-syntax
By calling this function, you can use special syntax #%(...) instead of fn macro. Any forms of fn macro can be used. If an integer is suppied after #%, fnn macro will be used with the integer instead of fn.
(enable-fn-syntax)
(funcall #%(* % %) 3)
; => 9
(funcall #%3(eq %2 1) 3 1 2)
; => T
Copyright (C) 2011 Tomohiro Matsuyama <[email protected]>. Licensed under the LLGPL License.