Pastebin on funcallable AMOP

1 files changed, 43 insertions, 0 deletions

diff --git a/_pastebins/2023-07-22-funcallable-amop.md b/_pastebins/2023-07-22-funcallable-amop.md
new file mode 100644
index 0000000..e3e796d
--- /dev/null
+++ b/_pastebins/2023-07-22-funcallable-amop.md
@@ -0,0 +1,43 @@
+---
+
+title: Funcallable AMOP
+
+date: 2022-07-14
+
+layout: post
+
+lang: en
+
+ref: funcallable-amop
+
+---
+
+
+Using `macrolet` to allow a `funcallable-standard-class` to be invoked without
+using `funcall` directly, and let the macroexpansion do that instead:
+
+```
+#!/usr/bin/env li
+
+(asdf:load-system :closer-mop)
+
+(defclass constructor ()
+  ((name   :initarg :name   :accessor constructor-name))
+  (:metaclass closer-mop:funcallable-standard-class))
+
+(defmethod initialize-instance :after ((c constructor) &key)
+  (with-slots (name) c
+    (closer-mop:set-funcallable-instance-function
+     c
+     (lambda (x)
+       (format t "~s: ~s - ~s~%" name :funcalled x)))))
+
+(let ((c (make-instance 'constructor :name "the-name")))
+  (funcall c 1))
+
+(let ((c (make-instance 'constructor :name "the-name")))
+  (macrolet ((c (&body body)
+               `(funcall c ,@body)))
+    (funcall c 2)
+    (c 3)))
+```