boost-spirit-qi

Here is a code sample: // file main.cpp #include <iostream> #include <boost/tuple/tuple.hpp> #include <boost/tuple/tuple_io.hpp> #include <boost/spirit/include/qi.hpp> int main() { std::string s( "1 A" ); boost::tuple<double, char> p; complex_matrix_parser::iterator b = s.begin(); complex_matrix_parser::iterator e = s.end(); qi::phrase_parse( b, e, ( qi::double_ >> qi::char_('A') ), qi::space, qi::skip_flag::postskip, p ); std::cerr << "==== " << p << std::endl; return 0; } This should print ==== (1 A) right? But it prints ==== (1 ) , so it skips the 'A' character. What am I doing wrong here?

I'm trying to write a basic OBJ file loader using the Boost Spirit library. Although I got it working using the standard std::ifstreams, I'm wondering if it's possible to do a phrase_parse on the entire file using a memory mapped file, since it seems to provide the best performance as posted here . I have the following code, which seems to work well, but it breaks when there is a comment in the file. So, my question is how do you ignore a comment that starts with a '#' in the OBJ file using Spririt? struct vertex { double x, y, z; }; BOOST_FUSION_ADAPT_STRUCT( vertex, (double, x) (double, y)

In Boost.Spirit one can read from a stream to a std::vector simply by doing: #include<vector> #include<boost/spirit/include/qi.hpp> namespace sqi = boost::spirit::qi; int main(){ std::string const v_str = "AA BB CC"; std::vector<std::string> v; auto it = begin(v_str); bool r = sqi::phrase_parse(it, end(v_str), (*sqi::lexeme[+sqi::char_("A-Z")]), sqi::space, v); assert( v.size() == 3 and v[2] == "CC" ); } However, it happens that I know the number of elements in advance because of the input format and I should be able to prereserve the space in the vector. For example if the input string is "3