问题描述
我想定义一个专门处理带有无符号字节8个元素的数组类型对象的方法.在sbcl中，当您(make-array x :element-type '(unsigned-byte 8))时，对象类由SB-KERNEL :: SIMPLE-ARRAY-UNSIGNED-BYTE-8实现.有没有专门针对无符号字节数组类型的与实现无关的方法?
I want to define a method that will specialize on an object of array type with unsigned byte 8 elements. In sbcl, when you (make-array x :element-type '(unsigned-byte 8)) the object class is implemented by SB-KERNEL::SIMPLE-ARRAY-UNSIGNED-BYTE-8. Is there an implementation independent way of specializing on unsigned-byte array types?
推荐答案
使用尖锐的点在读取时插入依赖于实现的对象类:
(defmethod foo ((v #.(class-of (make-array 0 :element-type '(unsigned-byte 8)))))
:unsigned-byte-8-array)
sharpsign -dot reader宏在读取时评估表单，确定数组的类.该方法将专门用于特定Common Lisp实现用于数组的类.
The sharpsign-dot reader macro evaluates the form at read-time, determining the class of the array. The method will be specialized on the class the particular Common Lisp implementation uses for the array.
这篇关于在普通的Lisp中，我该如何以可移植的方式检查对象的类型的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！