Subject: Re: [boost] [preprocessor] ARRAY_REPLACE bug?
From: Edward Diener (eldiener_at_[hidden])
Date: 2013-07-25 07:51:03
On 7/25/2013 5:10 AM, Mostafa wrote:
> On Windows 7/Cygwin, using boost 1.53, preprocessing the following snippet:
> #include <boost/preprocessor.hpp>
> //#define BOOST_PP_TUPLE_REM_0() // nothing
> #define ARRAY (3, (a, x, c))
> BOOST_PP_ARRAY_REPLACE(ARRAY, 1, b)
> g++ -E -P -I /... pp_array.cc
> gives the following incorrect result:
> (3, (BOOST_PP_TUPLE_REM_0 () a, b , c))
> Uncommenting the pound define in the snippet gives the correct result for
> the preprocessor.
> Is this a bug?
It looks like a bug to me. In your 1.53 version of tuple/rem.hpp add:
# define BOOST_PP_TUPLE_REM_0()
before the line which says:
# define BOOST_PP_TUPLE_REM_1(e0) e0
For some reason, possibly an oversight, Paul removed the "# define
BOOST_PP_TUPLE_REM_0()" from tuple/rem.hpp when variadic macro support
was added to the preprocessor.
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