On 27 May 2014 06:11, phi gcc wrote: > Hi All, > > I have a beginner question. > I have an ident that I #define this is a comma separated list of other > ident, and I'd like to augment this list, i.e basically something like > > #define L a > #define T L > #undef L > #define L T,b > > I have a growing list of ident (here a,b) I'd like to grow this as > include files to end up with a,b,c,d at some point this is given to a > va_args function like f(L) > > Indeed I know that the above #define/#undef will not make it, yet I > tried a lot of combo with ## in macro like > > #define A(l,x) l##,##x > #define l a > #define t A(l,b) > #undef l > #define l t > > But nothing works. You could have a look at how Boost.Preprocessor does this kind of thing, but using the preprocessor like this leads to madness.
