linux-kernel - Re: [Q]staging/comedi: Considation of *_find

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Date:	Tue, 29 Jan 2013 15:58:37 -0800
From:	Joe Perches <joe@...ches.com>
To:	Peter Hüwe <PeterHuewe@....de>
Cc:	Ian Abbott <abbotti@....co.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: Re: [Q]staging/comedi: Considation of *_find_boardinfo possible?

On Wed, 2013-01-30 at 00:41 +0100, Peter Hüwe wrote:
> ---> is there a way to consolidate these functions into one function (which 
> can operate on the different types) ?  It's almost a bit like 'templates'.
> Maybe with some gcc extensions or kernel magic functions ?

Nothing wrong with a macro.

Maybe something like:

#define comedi_find_board(array, board_id)		\
({							\
	int i;						\
	typeof array *p = array;			\
	typeof array *rtn = NULL;			\
	for (i = 0; i < ARRAY_SIZE(array); i++, p++) {	\
		if (p->device_id == board_id) {		\
			rtn = p;			\
			break;				\
		}					\
	}						\
	rtn;						\
})


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