Re: [boost] [typeof-users] Looking for a consistent scheme for adding Typeof support to Boost libraries

From: Arkadiy Vertleyb (vertleyb_at_[hidden])
Date: 2006-01-19 09:42:59

"Tobias Schwinger" <tschwinger_at_[hidden]> wrote

> The library [option #2] would implement typeof support like this:
>
> --- boost/<LIB>/typeof_support.hpp
>
>      #if !defined(<LIB>_TYPEOF_SUPPORT)
>      #  define <LIB>_TYPEOF_SUPPORT
>      #endif
>
>      #if defined(<include guard macro 1st file>)
>      #   if !defined(<typeof guard macro 1st file>)
>      #     define <typeof guard macro 1st file>
>      // <--  register components in file 1 here
>      #   endif
>      #endif
>
>      #if defined(<include guard macro 2nd file>)
>      #   if !defined(<typeof guard macro 2nd file>)
>      #     define <typeof guard macro 2nd file>
>      // <--  register components in file 2 here
>      #   endif
>      #endif
>
>      // [...]
>
> --- at the end of every source file:
>
>      #if defined(<LIB>_TYPEOF_SUPPORT)
>      #   include <boost/<LIB>/typeof_support.hpp>
>      #endif

OK, understand.  The last lines above make this solution intrusive, and #3
is intrusive as well...

What are the drawbacks of #1?

Regards,
Arkadiy