From: Eljay Love-Jensen <eljay@adobe.com>
To: Ming-Chia Jiang <jmc@wire.cs.nthu.edu.tw>, gcc-help@gcc.gnu.org
Subject: Re: extern functions in header file
Date: Fri, 10 Sep 2004 10:40:00 -0000 [thread overview]
Message-ID: <6.1.2.0.2.20040910053141.02d76340@iplan-mn.corp.adobe.com> (raw)
In-Reply-To: <20040910062659.M23072@wire.cs.nthu.edu.tw>
Hi Ming-Chia,
>Is there any difference between declaring functions with prefix "extern"
and without "extern" keyword in header files?
From a C++ vantage point...
Effectively (by and large), no there's no difference.
Philosophically, yes. Some consider (including myself) that supplying the
(optional) <code>extern</code> keyword is good practice because it is
self-documenting code.
Also, be aware that <code>extern "C"</code> has several important
(critical!) implications regarding C++ code.
Also, in some areas, <code>extern</code> is REQUIRED to distinguish
something that is "just a declaration" from being mistaken for a
"definition" (without having the <code>extern</code>). See Stroustrup's
C++ Programming Language (3rd or special edition) section 9.2.
I haven't done C work since 1990, so my comments may not be appropriate for
C "good style / best practices".
HTH,
--Eljay
next prev parent reply other threads:[~2004-09-10 10:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-10 6:37 Ming-Chia Jiang
2004-09-10 10:40 ` Eljay Love-Jensen [this message]
2004-09-10 11:04 ` Sriharsha Vedurmudi
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