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From: prj@po.cwru.edu (Paul Jarc)
Cc: guile-devel@gnu.org
Subject: Re: OpenBSD does not define INT8_MIN etc.
Date: Sat, 10 Jul 2004 11:57:41 -0400	[thread overview]
Message-ID: <m33c3zlur8.fsf@multivac.cwru.edu> (raw)
In-Reply-To: <873c40xab2.fsf@zagadka.ping.de> (Marius Vollmer's message of "Sat, 10 Jul 2004 15:26:41 +0200")

Marius Vollmer <mvo@zagadka.de> wrote:
>     #define SCM_I_UTYPE_MAX(type)       (~(type)0)

Maybe just personal preference, but I'd use ((type)-1).  That's
guaranteed to work by the C standard.

>     #define SCM_I_TYPE_MAX(type,utype)  ((type)((~(utype)0)/2))
>     #define SCM_I_TYPE_MIN(type,utype)  (-((type)((~(utype)0)/2))-1)

Will integer promotions get in the way here for smaller types?  I
think (utype)0 will be promoted to int before ~ is applied, etc.


paul


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      parent reply	other threads:[~2004-07-10 15:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-07-10  8:47 OpenBSD does not define INT8_MIN etc Andreas Vögele
2004-07-10 12:32 ` Andreas Vögele
2004-07-10 13:26 ` Marius Vollmer
2004-07-10 14:43   ` Andreas Vögele
2004-07-11  9:56     ` Andreas Vögele
2004-07-10 15:57   ` Paul Jarc [this message]

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