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Re: make ignore_value more generic; deprecate ignore_ptr


From: Eric Blake
Subject: Re: make ignore_value more generic; deprecate ignore_ptr
Date: Thu, 06 Jan 2011 15:19:37 -0700
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On 01/06/2011 03:15 PM, Eric Blake wrote:
> 
> +# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 1)
> +#  define ignore_value(x) ((void) (x))
> +# else
>  static inline void _ignore_value (intptr_t p) { (void) p; }
> -# define ignore_value(x) _ignore_value ((intptr_t) x)
> +#  define ignore_value(x) \
> +     _ignore_value (({__typeof__(x) __x = (x); (intptr_t) __x;}))
> +# endif

In fact, the simpler:

#  define ignore_value(x) (({__typeof__(x) __x = (x);(void)__x;}))

works on coreutils, and has the added perk of silencing _wur on aggregates!

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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