我一直在寻找的源defmacro它使用“让”,在它的定义:在clojure中defmacro如何根据自身来定义?
(def
^{:doc "Like defn, but the resulting function name is declared as a
macro and will be used as a macro by the compiler when it is
called."
:arglists '([name doc-string? attr-map? [params*] body]
[name doc-string? attr-map? ([params*] body)+ attr-map?])
:added "1.0"}
defmacro (fn [&form &env
name & args]
(let [prefix (loop [p (list name) args args]
然而,“让”被定义为一个宏本身:
(defmacro let
"binding => binding-form init-expr
Evaluates the exprs in a lexical context in which the symbols in
the binding-forms are bound to their respective init-exprs or parts
therein."
{:added "1.0", :special-form true, :forms '[(let [bindings*] exprs*)]}
[bindings & body]
(assert-args
(vector? bindings) "a vector for its binding"
(even? (count bindings)) "an even number of forms in binding vector")
`(let* ~(destructure bindings) [email protected]))
有人能解释一下这是有效的,因为我无法理解如何根据需要“defmacro”的事物来定义“defmacro”。 (如果这是有道理的:)
不是关于明显的循环定义的问题吗? – Jeremy