Re: [boost] [preprocessor] BOOST_PP_IS_UNARY()

Subject: Re: [boost] [preprocessor] BOOST_PP_IS_UNARY()
From: Lorenzo Caminiti (lorcaminiti_at_[hidden])
Date: 2010-04-11 18:38:28

On Sun, Apr 4, 2010 at 11:06 AM, Lorenzo Caminiti <lorcaminiti_at_[hidden]> wrote:
> Do you know what are the drawbacks of using BOOST_PP_IS_UNARY()? If
> you have used it, what is your experience with its portability?

Can at least the authors/maintainers of Boost.Preprocessor,
Boost.Spirit, and Boost.Typeof reply based on their experience using
BOOST_PP_IS_UNARY()?

Is it OK to use BOOST_PP_UNARY() as follow?

    #define PUBLIC_public (1)
    #define IS_PUBLIC(token) BOOST_PP_IS_UNARY(BOOST_PP_CAT(PUBLIC_, token))

    IS_PUBLIC(public)   // Expand to 1.
    IS_PUBLIC(xyz)       // Expand to 0.

This does work just fine on both GCC and MSVC.

Thank you very much.
Lorenzo