Clojure＃=阅读器宏 [英] Clojure #= reader macro

问题描述

我只是从＃= -make-my-macro-expand-before-system-macros> post 在Stackoverflow
，它解决了一个问题。这个读者宏成为一个
官方（记录的）语言的一部分的可能性有多大？

I just "discovered" the #= reader macro from a post on Stackoverflow and it solves a problem. How likely is this reader macro to become an official (documented) part of the language? How about deprecated or changed behavior?

＃= 阅读器宏会导致以下s表达式

The #= reader macro causes the following s-expression to be evaluated by the Lisp reader (before macro expansion).

推荐答案

当核心语言打印时，它被核心语言使用* print-dup * true，所以我打赌它会留下来。不知道为什么它没有记录。

It is used by the core language when something is printed with *print-dup* true, so I'd wager that it is going to stay. No idea why it is not documented.

user=> (binding [*print-dup* true] (prn {:foo 1 :bar 2}))
#=(clojure.lang.PersistentArrayMap/create {:foo 1, :bar 2})
nil

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