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  1. #include <boost/variant.hpp>
  2. #include <boost/spirit/include/karma.hpp>
  3.  
  4. namespace karma = boost::spirit::karma;
  5. typedef boost::variant<int, std::string> Parameter;
  6. typedef std::vector<Parameter> Parameters;
  7.  
  8. void test(boost::variant<Parameters, Parameter> const& v)
  9. {
  10.     typedef boost::spirit::ostream_iterator It;
  11.     using namespace karma;
  12.  
  13.     const static rule<It, std::string()> quoted
  14.         = '"' << *('\\' << char_('"') | char_) << '"'
  15.         ;
  16.     const static rule<It, Parameter()>   param
  17.         = int_ | quoted
  18.         ;
  19.     const static rule<It, boost::variant<Parameters, Parameter>()> rule
  20.         = param | param % ", "
  21.         ;
  22.  
  23.     std::cout << karma::format(rule, v) << '\n';
  24. }
  25.  
  26. int main()
  27. {
  28.     test(1);
  29.     test("foo");
  30.     test("escape: \"foo\"");
  31.     test(Parameters { 1, 2, 3, "escape: \"foo\"" });
  32. }
  33.  
  34.  
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https://ideone.com/wzgSXX
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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