[preprocessor] one comma too many

26 May 2010

      Hello,

Near sure this is trivial, but I don't see it, and hope someone might
point out the obvious:

#include 
#include 
#include 

#define OPERATOR(z, n, _)            \
                                     \
  BOOST_PP_ENUM_PARAMS(n, T r)
  /**/

#define BOOST_PP_LOCAL_MACRO(n) OPERATOR(_, n, _)
#define BOOST_PP_LOCAL_LIMITS(1, 3)
#include BOOST_PP_LOCAL_ITERATE()
#undef BOOST_PP_LOCAL_MACRO
#undef BOOST_PP_LOCAL_LIMITS
#undef OPERATOR

..The above works as expected:

   T r0
   T r0, T r1
   T r0, T r1, T r2

However, I would like to replace "T" with the following instead:

  std::pair

ie:  I want to write something to the effect of:

  BOOST_PP_ENUM_PARAMS(n, std::pair r)

Of course, BOOST_PP_ENUM_PARAMS now sees one too many arguments, and
errors.  Any ideas on how to achieve this would be most appreciated.

With thanks in advance,
-- 
Manfred

Manfred Doudar

Maxime van Noppen

Manfred Doudar

Daniel Bradburn

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