--- Joel Falcou
I have two sequences. Both represent sets, one is
subset of the other. What I want to do is for each element in the superset, generate one value if it is in the subset, and another value if it is not in
a the
subset. The problem is that the elements are not numeric (they are just tokens), so I can not seem to compare them to determine if they are the same.
Any sugestions?
What I woukld write is borrowed from the inner mechanics of Boost::PP. let's say you have two token FOO & BAR.
#define IS_SAME_TOKEN_FOO_FOO 1 #define IS_SAME_TOKEN_FOO_BAR 0 #define IS_SAME_TOKEN_BAR_FOO 0 #define IS_SAME_TOKEN_BAR_BAR 0
#define IS_SAME_TOKEN(X,Y)
BOOST_PP_CAT(BOOST_PP_CAT(BOOST_PP_CAT(IS_SAME_TOKEN_,X),_),Y)
then use IS_SAME_TOKEN in BOOST_PP_IF
I knwo it gets cumbersome as the number of tokens increase but I can't see hwo to do it better.
I have about a dozen tokens. Maybe I can automagicly generate the defines. . . I'll give it a try. Thanks, -EdK Ed Keith e_d_k@yahoo.com Blog: edkeith.blogspot.com ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ