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From: Alex Vong <alexvong1995@gmail.com>
To: guile-user@gnu.org
Subject: built-in procedural logical operator
Date: Tue, 1 Sep 2015 23:44:35 +0800	[thread overview]
Message-ID: <20150901234435.7d1c4384@debian> (raw)

Hi everyone,

I am learning scheme, please bear with me if I am wrong.

I try to define a new function LIST-OF-STRING?

    (define (list-of-string? lst)
      (reduce and #f (map string? lst)))

and I get the error

    While compiling expression:
    ERROR: Syntax error:
    unknown location: source expression failed to match any pattern in form and

It seems it is because AND is implemented as a macro,
so I try to implement my own RECURSIVE-AND

    (define (recursive-and . arg-lst)
      (cond ((null? arg-lst) #t)
            ((not (car arg-lst)) #f)
            (else (apply recursive-and (cdr arg-lst)))))

and now

    (define (list-of-string? lst)
      (reduce recursive-and #f (map string? lst)))

works as intended.

Is it a leaking implementation detail that AND is implemented as a macro?
Do we have a built-in procedural logical operators so that we don't that error?
I know it is easy enough to define your own RECURSIVE-AND and RECURSIVE-OR,
I just want to know it is a bug or a feature?
Thanks!

Cheers,
Alex



             reply	other threads:[~2015-09-01 15:44 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-01 15:44 Alex Vong [this message]
2015-09-01 16:21 ` built-in procedural logical operator David Kastrup
     [not found]   ` <CADrxHD8e6VoAsY5_rtD3od8iSR9VdZamDMiYQf2hNGcmq3Hdfw@mail.gmail.com>
2015-09-01 17:13     ` Alex Vong

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