From: ludo@gnu.org (Ludovic Courtès)
To: guile-user@gnu.org
Subject: Re: make-hash-table: Wrong type argument
Date: Thu, 10 Jul 2008 09:35:54 +0200 [thread overview]
Message-ID: <871w228a3p.fsf@gnu.org> (raw)
In-Reply-To: d16b1c80807090134i70e23fd5x2f64abe05dbdf864@mail.gmail.com
Hi,
"Shakthi Kannan" <shakthimaan@gmail.com> writes:
> Newbie here. I am trying to pass key/value to a procedure to add it to
> the hash-table. It fails at:
>
> "you"ERROR: In procedure hash_fn_create_handle_x:
> ERROR: Wrong type argument in position 1: "foo"
Note: If you run Guile with `--debug', you should get a nice backtrace
here.
The problem is that you pass `hash-set!' the string "foo" as its first
argument, while it expects a hash table (as returned by
`make-hash-table').
I think there is some confusion:
> (define make-dictionary
> (lambda (name size)
> (lambda ()
> (define name (make-hash-table size)))))
`define' here is an "internal define", i.e., it defines a variable
that's local to the lambda where it occurs. Furthermore, `name' is
taken literally, it's not substituted by the actual parameter passed to
`make-dictionary'.
Hope this helps,
Ludovic.
prev parent reply other threads:[~2008-07-10 7:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-09 8:34 make-hash-table: Wrong type argument Shakthi Kannan
2008-07-10 7:35 ` Ludovic Courtès [this message]
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