为什么我得到不能动态绑定非动态var? [英] Why I'm getting Can't dynamically bind non-dynamic var?
问题描述
我试图使用clojure.tools.trace命名空间的dotrace函数。
(dotrace [my-function](my-function 5))
但我遇到这个错误:
IllegalStateException无法动态绑定非动态var:my-ns / my-function clojure.lang.Var.pushThreadBindings(Var.java:339)
这是什么意思?
我认为你需要将你的函数声明为动态绑定,例如
函数
(fn [x] .....))
是因为如果你没有明确要求动态var,Clojure(1.3以上)将使其非动态作为性能优化。
I'm trying to use dotrace function of clojure.tools.trace namespace.
(dotrace [my-function] (my-function 5))
But I got this error:
IllegalStateException Can't dynamically bind non-dynamic var: my-ns/my-function clojure.lang.Var.pushThreadBindings (Var.java:339)
What does it mean? why I'm getting it?
(I'm using Clojure 1.3)
I think you need to declare your function as being dynamically bound, e.g.
(def ^:dynamic my-function
(fn [x] .....))
The reason for that is because if you don't explicitly ask for a dynamic var, Clojure (1.3 upwards) will make it non-dynamic as a performance optimization.
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