boost-spirit-karma

Imagine we want to parse and generate simple C++ member function declarations with Boost.Spirit. The Qi grammar might look like this: function_ %= type_ > id_ > "()" > matches["const"]; That means, whether the function is const is stored in a bool . How to write the corresponding generator with Karma? function_ %= type_ << ' ' << id_ << "()" << XXX[" const"]; Here, we want a directive that consumes a boolean attribute, executes the embedded generator if the attribute is true and does nothing otherwise. We want something that makes the following tests succeed. test_generator_attr("abc", XXX[

I am trying to escape a string in quotation marks using boost::spirit::karma. This works fine if it's just a string. However, for a string in a boost::variant in a std::vector, it does not. Just printing the string does work however, I do not quite understand why. Line (1) works fine, but doesn't do what I want. Line (2) should do it, but 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:

I am writing a karma generator to generate a HTML page and I am experiencing inconsistent behavior while using column directive. It could very well be my understanding of how it works. Basically I am generating a grid which requires me to insert some delimiters after every 2 occurrences of the data. The below is a basic program I adopted to do a test run. #include <boost/config/warning_disable.hpp> #include <boost/spirit/include/karma.hpp> #include <boost/fusion/include/struct.hpp> #include <boost/fusion/include/nview.hpp> #include <boost/assign/std/vector.hpp> namespace fusion = boost::fusion

I have a Qi grammar definition that I use to parse an input. Later I have a Karma generator to output in a way that should be similar to the input. Is this possible at all? It seem that a parser grammar can be transformed into a generator grammar automatically (??). #include <boost/config/warning_disable.hpp> #include <boost/spirit/include/qi.hpp> #include <boost/spirit/include/karma.hpp> #include <iostream> int main(){ //test input std::string s = "Xx 1.233 pseudo"; //input variables std::string element; double mass; std::string pseudo; auto GRAMMAR = boost::spirit::qi::lexeme[+(boost::spirit