Re: [Boost-users] [preprocessor] Strange BOOST_PP_CAT behavior

From: Sergey Sadovnikov (flex_ferrum_at_[hidden])
Date: 2008-05-08 06:37:32

Hello, John.

Thursday, May 8, 2008 at 2:24:56 PM you wrote:

JF> Since PP_CAT in the first version expanded to BAR_MACRO_1(S), the
JF> preprocessor expanded it which invokes PP_CAT again.
JF> By putting the sequence outside of the  PP_CAT  macro,  it just expanded
JF> to BAR_MACRO_1 -- no parenthesis -- and therefor it was not expanded
JF> inside PP_CAT macro, and we were safe.

JF> Since your own macro was not PP_CAT, there was no recursion in yours and
JF> apparently everything worked.

JF> At least I think that is what happened :)
Yes. I think so too.
John, thanks a lot for such extended explanation! You really help me.

-- 
Best Regards,
 Sergey                          mailto:flex_ferrum_at_[hidden]