Re: [boost] [preprocessor] Warning: Incoming

Subject: Re: [boost] [preprocessor] Warning: Incoming
From: Jeffrey Lee Hellrung, Jr. (jeffrey.hellrung_at_[hidden])
Date: 2011-06-27 20:31:27

On Mon, Jun 27, 2011 at 4:21 PM, Edward Diener <eldiener_at_[hidden]>wrote:
[...]

> This has led me to work on some macros for pp-lib, which uses variadics,
> which can tell whether a macro parameter is a tuple, array, seq, or list.
>
> Then in your case you can go:
>
> #define STRIP_PARENS(x)\
> BOOST_PP_IIF(BOOSTPP_IS_TUPLE(x),BOOST_PP_TUPLE_ENUM(x),x)
>

I'm not a preprocessing expert, so I would be afraid of the preprocessor
trying to expand BOOST_PP_TUPLE_ENUM(x) when x is not a tuple.  If so, I
would think something like

#define STRIP_PARENS( x ) BOOST_PP_IIF( BOOST_PP_IS_TUPLE( x ),
BOOST_PP_TUPLE_ENUM, BOOST_PP_IDENTITY ) ( x )

would be better...?

- Jeff