Scheme基本概念之 Disjointness of Types

来源:互联网 发布:淘宝客交流群 编辑:程序博客网 时间:2024/06/10 11:42
Every object satisfi es at most one of the following predicates :
bit-string?        environment?     port?                symbol?
boolean?            null?                 procedure?       vector?
cell?                  number?           promise?           weak-pair?
char?                 pair?                string?
condition?