下面的宏尝试从 init 参数分配一个成员变量。
但
name 'self' is not defined
(defmacro optional_assign [x &optional [base self]]
`(lif ~x (setv (. ~base ~x) ~x) (setv (. ~base ~x ) None) ))
(defclass clsa []
(defn __init__ [self &optional y]
(optional_assign y)
))
(setv insa1 (clsa 123))
(print insa1.y) ;;=>123
(setv insa2 (clsa))
(print insa2.y) ;;=>None