linux-kernel - Re: Comma at end of enum lists

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Date:	Sat, 29 Mar 2008 18:19:38 +0100
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Jacek Luczak <difrost.kernel@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Comma at end of enum lists

Jacek Luczak writes:
 > Hi All,
 > 
 > I've found that in many enum lists, there's a comma at the end, e.g. 
 > (arch/x86/kernel/early_printk.c):
 > 
 > enum {
 >          MAGIC1 = 0xBACCD00A,
 >          MAGIC2 = 0xCA110000,
 >          XOPEN = 5,
 >          XWRITE = 4,
 > };
 > 
 > Just out of curiosity, is there any particular reason here (no word in 
 > CodingStyle about that).

Yes. This idiom allows you to add or remove items without
changing adjacent lines.

In a language with strict a comma-as-separator rule you can
get this benefit by placing the comma before new items rather
than after existing items:

enum {	FOO
	,FIE
	,FUM
};

but luckily C doesn't need this perversion.
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