#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix.hpp>
#include <boost/phoenix/stl.hpp>
#include <boost/spirit/include/qi_uint.hpp>
#include <boost/phoenix/phoenix.hpp>

std::vector<unsigned> L;

int
main() {
    using namespace boost::spirit::qi;
    using namespace boost::phoenix;
    using boost::phoenix::arg_names::_1;
    const std::string str("3 1 2 3");
    std::string::const_iterator first = str.begin();
    parse(first,str.end(), uint_[reserve(L,_1)] >> repeat(capacity(L))[ uint_ ]);

}