Re: [Boost-users] [preprocessor]:issues with expansion.

Subject: Re: [Boost-users] [preprocessor]:issues with expansion.
From: Jeffrey Lee Hellrung, Jr. (jeffrey.hellrung_at_[hidden])
Date: 2012-12-19 23:13:23

On Wed, Dec 19, 2012 at 3:58 PM, Littlefield, Tyler <tyler_at_[hidden]>wrote:

> hello all:
> I have the following code:
> #define REGISTER_MODULE(module)(\
> #ifdef BOOST_PP_EQUAL(BOOST_PP_LIST_**SIZE(MODULES), 0)\
> //there are currently no modules in the list.
> #define MODULES((module), BOOST_PP_NIL)
> #else
> BOOST_PP_LIST_APPEND(MODULES, module)\
> #endif
> )
>
> I am somewhat of a newb at preprocessor magic, so any advice would be
> useful. For whatever reason this translates out to 'module)' when I try to
> compile it with -E -P.
> The idea is that it will add to the modules list (assuming the modules
> list exists) the module to be registered, which should just be a type.
> Thanks,

Someone can correct me here, but I believe you can't use preprocessor
directives (#define, #if, etc.) within a macro definition, and, well, who
knows what'll happen if you try :/

- Jeff