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Boost.Spirit.Qi: Take a rule's attribute and set it as a field of an enclosing rule's struct attribute?
struct Integer {
  int value;
};
BOOST_FUSION_ADAPT_STRUCT(Integer, (int, value))

qi::rule<Iterator, Integer> integer;

integer = qi::int_;

qi::phrase_parse(iter, end, g, space, myInteger);

integer = qi::int_[qi::_val = qi::_1]; //compiles, uninitialized value
integer = qi::int_[qi::_r1 = qi::_1]; //doesn't compile
integer = qi::int_[phoenix::bind(&Integer::value, qi::_val) = qi::_1]; //doesn't
integer = qi::int_[phoenix::at_c<0>(qi::_val) = qi::_1]; //doesn't

qi::rule<Iterator, Integer()> integer;

integer = qi::int_[qi::_val = qi::_1];

struct Integer {
    int value;
    Integer& operator=(int) {...}
};

integer = qi::int_ >> qi::eps;

integer = qi::int_[qi::_r1 = qi::_1];

integer = qi::int_[phoenix::bind(&Integer::value, qi::_val) = qi::_1];

integer = qi::int_[phoenix::at_c<0>(qi::_val) = qi::_1];