I have been working on a better understanding of compile time code especially where spirit::x3 is concerned. I have a class my_uuid and it is working fine compiled with x3::rule. But as Iterator is declared outside of the scope, it is only good for std::string::iterator. So I thought I'd just create a component written like x3::int_parser. And as far as I can see, it has exactly the same signature. I've tried putting it in the x3 namespace and including right after the `..\x3\numeric\int.hpp' header thinking there is some good reason, but it evades me.
If I set a break point in my uuid_parser and the int_parser I can see that the int_parser is left alone, called right from the parser sequence. But my parser is wrapped as if it were a container. If I uncomment the parser at line 40, the compiler starts looking for the likes of insert. So, that is even more confusing, why doesn't it compile with the need of insert or move if I leave it as the last component in the sequence?
I seem to be missing something very fundamental here. My question is not how to fix this but what am I missing. Thanks.
#include<iostream>
#include <vector>
#include <boost/spirit/home/x3.hpp>
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/uuid/uuid_io.hpp>
namespace x3 = boost::spirit::x3;
struct uuid_parser : x3::parser<uuid_parser> {
typedef boost::uuids::uuid attribute_type;
static bool const has_attribute = true;
static bool const handles_container = false;
template <typename Iterator, typename Context, typename Attribute>
bool parse(Iterator& first, Iterator const& last, Context const& context, x3::unused_type, Attribute& uuid) const {
boost::iterator_range<Iterator> rng;
auto ret = x3::parse(first, last, x3::raw[*x3::char_("0-9a-fA-F-")], rng);
try {
uuid = boost::uuids::string_generator()(rng.begin(), rng.end());
}
catch (std::exception& e) {
boost::ignore_unused(e);
return false;
}
return true;
}
};
const uuid_parser uuid_ = {};
int main() {
std::string uuid_str(R"( id(78461bab-6d7c-48bc-a79a-b716d1ab97cb
id(9350cf32-7fe5-40d2-8a0d-c7f7562d7a15
id(bad-9350cf32-7fe5-40d2-8a0d-c7f7562d7a15
)");
auto first(uuid_str.begin());
std::vector<boost::uuids::uuid> attr;
x3::phrase_parse(first, uuid_str.end(), *(x3::lit("id(") >> uuid_), x3::space, attr);
//x3::phrase_parse(first, uuid_str.end(), *(x3::lit("uid(") >> uuid_ >> ')'), x3::space, attr);
for (auto& item : attr)
std::cout << item << std::endl;
std::string int_str(" x(1) x(2) x(3)"); auto ibegin(int_str.begin());
std::vector<int> int_vect;
x3::phrase_parse(ibegin, int_str.end(), *(x3::lit("x(") >> x3::int_ >> ')'), x3::space, int_vect);
for (auto& item : int_vect)
std::cout << item << std::endl;
return 0;
}
