原谅我的无知 但两者有什么区别
(define blah)
(define* blah)
不幸的是,谷歌忽略了星号字符。
SRFI 89 是Gambits作者写的,所以假设Gambits define/code>做该文件所说的事情是有道理的。 :-)
换句话说,它是在lambda/code>(如SRFI 89所述)而不是lambda 上的合成糖。
在《甘比特计划》的文件 < a href=" http://www.iro. umontreal.ca/~gambit/doc/gambit-c.html" rel=“no follow” > Documentation 中,没有提及 "define\\\/code > 特殊形式;它可能是某种程序、定义、宏观或特殊形式,只有在你看到的代码中找到。您应该张贴一个链接,引用代码的来源,其中正在使用 define/code>。
这个问题最好多说点背景情况。
Sometimes the * just means that the form does something extra. My guess is therefore that define* works as ordinary define, but at the same time does something extra. This extra could be automatically exporting the name from a module.
This definition was found in the Racket ffi-lib illustrates this principle:
(define-syntax define*
(syntax-rules ()
[(_ (name . args) body ...)
(begin (provide name) (define (name . args) body ...))]
[(_ name expr)
(begin (provide name) (define name expr))]))
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