netdev - Re: [RFC v3 1/6] can: extend sockaddr

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Message-ID: <1300112100.3423.24.camel@edumazet-laptop>
Date:	Mon, 14 Mar 2011 15:15:00 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Kurt Van Dijck <kurt.van.dijck@....be>
Cc:	socketcan-core@...ts.berlios.de, netdev@...r.kernel.org
Subject: Re: [RFC v3 1/6] can: extend sockaddr_can to include j1939 members

Le lundi 14 mars 2011 à 14:24 +0100, Kurt Van Dijck a écrit :

> +/*
> + * required_size
> + * macro to find the minimum size of a struct
> + * that includes a requested member
> + */
> +#define required_size(member, struct_type) \
> +	(offsetof(typeof(struct_type), member) + \
> +	 sizeof(((typeof(struct_type) *)(0))->member))
> +

Hmm, most similar macros reverse arguments.

(For example : offsetof())

What about

#define required_size(TYPE, MEMBER) ...



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