clojure - 可以记住 Clojure 中的 Java 反射吗？

Question

类型提示可以极大地改善反射发生多次的执行时间。我对类型提示的理解是它只允许编译器缓存反射查找。缓存可以动态发生吗？或者有什么原因这会很糟糕/不可能？

Answer 1

来自 Programming Clojure :

These warnings indicate that Clojure has no way to know the type of c. You can provide a type hint to fix this, using the metadata syntax ^Class:

(defn describe-class [#^Class c]
{:name (.getName c)
:final (java.lang.reflect.Modifier/isFinal (.getModifiers c))})

With the type hint in place, the reflection warnings will disappear. The compiled Clojure code will be exactly the same as compiled Java code. Further, attempts to call describe-class with something other than a Class will fail with a ClassCastException.

所以总而言之，反射转换不仅仅是缓存，它被消除了。