Re: [boost] [preprocessor] [variadic] VMD_SIZE using ADD -- why?

Subject: Re: [boost] [preprocessor] [variadic] VMD_SIZE using ADD -- why?
From: Edward Diener (eldiener_at_[hidden])
Date: 2011-06-06 13:24:03

On 6/6/2011 12:51 PM, lcaminiti wrote:
> Hello all,
>
> I am using the VMD Boost Library Under Construction to handle variadic
> macros.
>
> On MVSC, this library uses PP_ADD to calculate the variadic size
> VMD_SIZE(__VA_ARGS__). However, it does not provide a reentrant version of
> VMD_SIZE (like VMD_SIZE_D) which is a problem when nesting size calculations
> within while iterations because PP_ADD uses PP_WHILE. I think, if this
> implementation is kept, the library should also provide the reentrant
> variant VMD_SIZE_D that invokes PP_ADD_D instead of PP_ADD.

Actually the latest version uses its own internal version of PP_CAT to 
avoid re-entrancy problems with end-users using PP_CAT.