core=> (defrecord Puffball [id name])
core.Puffball
core=> (Puffball. 149 "Urist")
#core.Puffball{:id 149, :name "Urist"}
core=> (apply Puffball. [149 "Urist"])
CompilerException java.lang.RuntimeException: java.lang.ClassNotFoundException: Puffball., compiling:(NO_SOURCE_PATH:3)
core=> (apply Puffball [149 "Urist"])
ClassCastException java.lang.Class cannot be cast to clojure.lang.IFn clojure.core/apply (core.clj:600)
如何从矢量创建马勃球?
最佳答案
在 Clojure 1.3 中,记录定义自动引入工厂函数:
Clojure 1.3.0
user=> (defrecord Puffball [id name])
user.Puffball
user=> (apply ->Puffball [149 "Urist"])
#user.Puffball{:id 149, :name "Urist"}
->Puffball
是“位置”工厂函数;还有 map->Puffball
,顾名思义。
关于constructor - 使用 defrecord 构造函数调用 apply?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8876425/