From: Dan Cross <cross@math.psu.edu>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] thread
Date: Thu, 5 Jul 2001 22:05:12 -0400 [thread overview]
Message-ID: <200107060205.WAA21989@augusta.math.psu.edu> (raw)
In-Reply-To: <20010706010009.D94AF199C0@mail.cse.psu.edu>
In article <20010706010009.D94AF199C0@mail.cse.psu.edu> you write:
>Hello 9fans,
Hey Kenji,
>Manual of thread shows the example codes such as:
> char m[48];
> ...
> {nil, &m, CHANRCV},
>I wonder that &m is a typo.
No, &m in this context is perfectly legal C. ``&'' in C says
to take the address of the referenced object (m), where m refers
to that 48 char array. However, ``m'' by itself will also decay
into a pointer to the array, so the two uses are equivalent in
this context. At least, that's the gist of it; Doug Gywn would
be able to describe it more precisely than I have.
As Rob says, though, the & is irrelevant, and I've seen it be
confusing in the past; particularly for junior programmers. I
recommend writing C code which references arrays without the &.
- Dan C.
next prev parent reply other threads:[~2001-07-06 2:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-06 0:50 arisawa
2001-07-06 2:05 ` Dan Cross [this message]
2001-07-06 1:02 rob pike
2001-07-06 4:15 arisawa
2001-07-06 14:41 ` Dan Cross
2001-07-06 18:24 ` Boyd Roberts
2001-07-06 5:55 dmr
2001-07-06 16:54 ` Digby Tarvin
2001-07-09 8:33 ` Douglas A. Gwyn
2001-07-09 11:46 ` Digby Tarvin
2001-07-09 17:03 ` Dan Cross
2001-07-09 11:49 ` Boyd Roberts
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