* virtual inline vs inline
@ 2013-11-04 13:33 Norbert Dajka
2013-11-04 14:51 ` Jonathan Wakely
0 siblings, 1 reply; 2+ messages in thread
From: Norbert Dajka @ 2013-11-04 13:33 UTC (permalink / raw)
To: gcc-help
Hello,
I would like to know, if there is any difference (in allocated memory
space) between defining a function inline in the class declaration
(with the inline word), and defining a function inline explicit after
the class declaration.
In addition, does anybody know, why a previously only inline declared
function takes up more memory space, if it's declared virtual inline
(even if the classes to which the declaring class of the function is a
parent class doesn't have their own implementation)?
Best regards,
Norbert
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: virtual inline vs inline
2013-11-04 13:33 virtual inline vs inline Norbert Dajka
@ 2013-11-04 14:51 ` Jonathan Wakely
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2013-11-04 14:51 UTC (permalink / raw)
To: Norbert Dajka; +Cc: gcc-help
On 4 November 2013 13:33, Norbert Dajka wrote:
> Hello,
>
> I would like to know, if there is any difference (in allocated memory
> space) between defining a function inline in the class declaration
> (with the inline word), and defining a function inline explicit after
> the class declaration.
There is no difference.
> In addition, does anybody know, why a previously only inline declared
> function takes up more memory space, if it's declared virtual inline
> (even if the classes to which the declaring class of the function is a
> parent class doesn't have their own implementation)?
Because virtual functions need additional metadata in the class,
specifically in the ABI used by G++ the class must have a pointer to
the vtable (if it didn't have one already) and the vtable will have an
additional entry for the virtual function.
^ permalink raw reply [flat|nested] 2+ messages in thread
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