[libvirt] [PATCH 02/10] internal: Introduce macro for stealing pointers

[Pavel Hrdina]

On Wed, Aug 03, 2016 at 10:10:54AM +0200, Peter Krempa wrote:
> VIR_STEAL copies the second argument into the first and then sets it to
> NULL. This is useful for stealing pointers.
> ---
>  src/internal.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/src/internal.h b/src/internal.h
> index 0dc34c7..c633ee6 100644
> --- a/src/internal.h
> +++ b/src/internal.h
> @@ -307,6 +307,18 @@
>      } while (0)
> 
>  /**
> + * VIR_STEAL:
> + *
> + * Steals pointer passed as second argument into the first argument. Second
> + * argument must not have side effects.
> + */
> +# define VIR_STEAL(a, b)  \
> +    do { \
> +        (a) = (b); \
> +        (b) = NULL;\
> +    } while (0)

I guess that there is no harm having this macro even though it's only two lines
of code.

I would align the backslash to the same column as we tend to do in libvirt code.

ACK