Re: [boost] Alternative implementation for BOOST_PP_VARIADIC_SIZE

Subject: Re: [boost] Alternative implementation for BOOST_PP_VARIADIC_SIZE
From: Paul Mensonides (pmenso57_at_[hidden])
Date: 2011-11-14 02:53:21

On Sun, 13 Nov 2011 21:10:11 -0800, Jeffrey Lee Hellrung, Jr. wrote:

> I'm just curious, is
> 
> --------
> #define A(...)
> A(,)
> --------
> 
> legal?

Yes.  "Empty" is a valid argument in >= C99 and >= C++0x.  An example of 
when an empty argument actually appears when passing around a cv-
qualifier: nothing | const | volatile | const volatile.  This is only one 
of many many scenarios where emptiness is a valid element and has meaning.

Regards,
Paul Mensonides