I can't see what's wrong: I've taken the effort to reconstruct your SSCCE.
In the process, it seems I must have removed the problem. I suggest you do the same.
Oh, and this is how I'd write this:
- no more phoenix
- no more constructors
- no more qi::locals
- no more needless copying
- using expectation points
In short: no more fuss.
#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/adapted/struct.hpp>
#include <cstdint>
namespace qi = boost::spirit::qi;
namespace chs = boost::spirit::ascii; //qi;
typedef std::string::const_iterator StringIterator;
struct Color
{
float r,g,b,a;
};
BOOST_FUSION_ADAPT_STRUCT(Color, (float, r)(float, g)(float, b)(float, a))
template <typename ItType, typename Skipper>
struct ColorGrammar : public qi::grammar<StringIterator, Color(), Skipper>
{
ColorGrammar()
: ColorGrammar::base_type(rule_color, "color-grammar")
{
using namespace qi;
rule_rgb = lit("rgb") >> '(' > float_ > ',' > float_ > ',' > float_ > attr(1.0f) > ')';
rule_rgba = lit("rgba") >> '(' > float_ > ',' > float_ > ',' > float_ > ',' > float_ > ')';
rule_color = rule_rgb | rule_rgba;
}
private:
qi::uint_parser<uint8_t, 10, 1, 3> number; // unused
qi::uint_parser<uint8_t, 16, 1, 1> hexdigit; // unused
qi::rule<ItType, Color(), Skipper> rule_rgb, rule_rgba, rule_color;
};
int main()
{
Color out;
std::string str = " rgb ( 0.3 , .4 , 0.5 )";
StringIterator begin = str.cbegin();
StringIterator end = str.cend();
ColorGrammar<StringIterator, chs::space_type> color_;
bool result = qi::phrase_parse(begin, end, color_, chs::space, out);
std::cout << std::boolalpha << result << '\n';
std::cout << "remains: '" << std::string(begin, end) << "'\n";
}