Re: [boost] Abstract STL Container Adaptors

The second way is to use sequence iteration, like this:

Sorry, for the sequence iteration it should be more like this:     #define FLATTEN_II(r, data, x) x     #define FLATTEN_I(seq) BOOST_PP_SEQ_FOR_EACH(FLATTEN_II, ~, seq)     #define FLATTEN(seq) BOOST_PP_CAT(FLATTEN_1 seq, _END)     #define FLATTEN_1(x) (FLATTEN_I(x)) FLATTEN_2     #define FLATTEN_2(x) (FLATTEN_I(x)) FLATTEN_1     #define FLATTEN_1_END     #define FLATTEN_2_END     // expands to a b c d e f     FLATTEN     (         ( (a)(b)(c) )         ( (d)(e)(f) )     )

Thanks, Paul Fultz II