boost::spirit::karma output of string in quotation marks -


i trying escape string in quotation marks using boost::spirit::karma. works fine if it's string. however, string in boost::variant in std::vector, not. printing string work however, not quite understand why.

line (1) works fine, doesn't want. line (2) should it, doesn't.

#include <iostream> #include <string> #include <boost/variant.hpp> #include <boost/spirit/include/karma.hpp> namespace karma = boost::spirit::karma;  typedef std::vector<boost::variant<int, std::string>> parameterlist; typedef boost::variant<int, std::string, parameterlist> parameter;  main() {     using karma::int_;     using boost::spirit::ascii::string;     using karma::eol;     using karma::lit;      std::string generated;     std::back_insert_iterator<std::string> sink(generated);      // (1)     karma::rule<std::back_insert_iterator<std::string>, parameterlist()> parameterlistrule = (int_ | string) % lit(", "); // works!      // (2)     //karma::rule<std::back_insert_iterator<std::string>, parameterlist()> parameterlistrule = (int_ | (lit('"') << string << lit('"'))) % lit(", "); // not work      karma::rule<std::back_insert_iterator<std::string>, parameter()> parameterrule = (int_ | (lit('"') << string << lit('"')) | parameterlistrule) << eol; // work, though escapes string in pair of quotation marks      karma::generate(sink, parameterrule, 1); // works     karma::generate(sink, parameterrule, "foo"); // works     karma::generate(sink, parameterrule, parameter(parameterlist{1, "foo"})); // works using rule (1), not (2)     std::cout << generated; }

if iterate data types, should iterate rules.

#include <iostream> #include <string> #include <boost/variant.hpp> #include <boost/spirit/include/karma.hpp> namespace karma = boost::spirit::karma;  typedef boost::variant<int, std::string> item; typedef std::vector<item> parameterlist; typedef boost::variant<int, std::string, parameterlist> parameter;  int main() {   using karma::int_;   using boost::spirit::ascii::string;   using karma::eol;   using karma::lit;    std::string generated;   std::back_insert_iterator<std::string> sink(generated);    karma::rule<std::back_insert_iterator<std::string>, item()> itemrule =       int_ | (lit('"') << string << lit('"'));    karma::rule<std::back_insert_iterator<std::string>, parameterlist()>     parameterlistrule =  itemrule % lit(", ");    karma::rule<std::back_insert_iterator<std::string>, parameter()>     parameterrule = (int_ | (lit('"') << string << lit('"')) | parameterlistrule) << eol;    karma::generate(sink, parameterrule, 1);   karma::generate(sink, parameterrule, "foo");   karma::generate(sink, parameterrule, parameter(parameterlist {1, "foo"}));   std::cout << generated;    return 0; }

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