[boost] Preprocessor warning from BOOST_PP_SEQ_ELEM

2 Mar 2005

      Hi All,

When I run the following code through the preprocessor, it emits the
correct output:

     alpha is simple;
     beta is simple;
     gamma is complex and color is red;
     delta is simple;
     epsilon is complex ;

but it also emits the folowing warning (several times):

     macro "BOOST_PP_SEQ_ELEM_III" requires 2 arguments, but only 1 given

My question is, how can I eliminate the warning. Thanks in advance
for any comments/advice.

#  include <boost/preprocessor/library.hpp>

#define IS_SIMPLE(t)   BOOST_PP_NOT_EQUAL(3, BOOST_PP_SEQ_SIZE(t))
#define PROPERTIES(t)  BOOST_PP_SEQ_ELEM(2,t)
#define HAS_COLOR(t)   BOOST_PP_EQUAL(2, BOOST_PP_SEQ_ELEM(0, \
                                                PROPERTIES(t)))
#define COLOR(t)       BOOST_PP_SEQ_ELEM(1, PROPERTIES(t))

#define FSIMPLE(a, s, i, t)                                      \
     BOOST_PP_SEQ_ELEM(0,t) is simple;

#define FCOMPLEX(a, s, i, t)                                      \
     BOOST_PP_SEQ_ELEM(0,t) is complex \
     BOOST_PP_IF(HAS_COLOR(t), and color is COLOR(t) , );

#define FCHOICE(a, s, i, t) \
     BOOST_PP_IF(IS_SIMPLE(t), \
         FSIMPLE(a, s, i, t), \
         FCOMPLEX(a, s, i, t))

#define T(s)\
     BOOST_PP_SEQ_FOR_EACH_I(FCHOICE, s, s) \

T (
    //  ID        Frequency       Properties
    (   (alpha)   (16)                                       )
    (   (beta)     (3)                                       )
    (   (gamma)   (13)            ((2) (red))                )
    (   (delta)    (5)                                       )
    (   (epsilon) (13)            ((4) (heavy))              )
)

[boost] Preprocessor warning from BOOST_PP_SEQ_ELEM

Edward Bishop