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left_align[], center[], right_align[])repeat[])verbatim[], no_delimit[], delimit[])upper[], lower[])maxwidth[])buffer[])omit[] and skip[])duplicate[])columns[])as<T>, as_string[], as_wstring[])
          This module includes different generator directives. It includes alignment
          directives (left_align[], center[], and right_align[]), repetition (repeat[]), directives controlling automatic delimiting
          (verbatim[],
          no_delimit[],
          and delimit[]),
          controlling case sensitivity (upper[] and lower[]), field width (maxwidth[]), buffering (buffer[]), splitting into columns (columns[])
          and attribute handling (duplicate[], omit[], and skip[]).
        
// forwards to <boost/spirit/home/karma/directive.hpp> #include <boost/spirit/include/karma_directive.hpp>
Also, see Include Structure.