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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;; ;;; MAP-OPERATORS-2 (eval-when (:compile-toplevel :load-toplevel :execute) (defun map-operators-2 (func form &optional env) (agnostic-lizard:walk-form form env :on-special-form (lambda (f env) (if (consp f) (funcall func f :special env) f)) :on-function-form (lambda (f env) (if (consp f) (funcall func f :function env) f))))) ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;; ;;; WITH-OVERLOAD (defmacro with-overload (specs &body body &environment env) (map-operators-2 (lambda (op type env) (declare (ignore env)) (if (eq type :function) (let ((new (find (car op) specs :key #'first :test #'string-equal))) (if new (cons (second new) (cdr op)) op)) op)) `(progn ,@body) env)) ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;; ;;; WITH-OVERLOAD Examples ;;; WITH-OVERLOAD Example 1 (with-overload ((+ -)) (+ 2 2)) ;; => 0 ;;; WITH-OVERLOAD Example 2 (values (multiple-value-list (values (+ 2 2) (+ (+ (+ 0 1) 2) 3))) (multiple-value-list (with-overload ((+ -)) (values (+ 2 2) (+ (+ (+ 0 1) 2) 3))))) ;; => (4 6), (0 -6) ;;; TODO: WITH-OVERLOAD Example 3 (defmacro zoz (a b) `(format t "zoz: ~a, ~a!~%" ,a ,b)) (with-overload ((zoz +)) (zoz 1 2)) ;; >> zoz: 1, 2! ;; => NIL ;;; TODO: WITH-OVERLOAD Example 4 (macrolet ((hello (a b) `(format t "zoz: ~a, ~a!~%" ,a ,b))) (with-overload ((hello +)) (hello 1 2))) ;; => 3