double-nested aggregate attribute not working

[akrzemi1]

The following example works with Boost.Spirit but not with Boost.Parser.

#include <vector>

#ifdef WITH_BOOST_SPIRIT
#include <boost/fusion/adapted/struct/adapt_struct.hpp>
#include <boost/spirit/include/qi.hpp>
namespace bp = boost::spirit::qi;
#else
#include <boost/parser/parser.hpp>
namespace bp = boost::parser;
#endif

struct X {
  char a;
  int b;
};

struct Y {
  std::vector<X> x;
  int c;
};

struct Z {
  std::vector<Y> y;
  int d;
};

#ifdef WITH_BOOST_SPIRIT
BOOST_FUSION_ADAPT_STRUCT(X, a, b);
BOOST_FUSION_ADAPT_STRUCT(Y, x, c);
BOOST_FUSION_ADAPT_STRUCT(Z, y, d);
#endif

int main()
{
  auto parse_x = bp::char_ >> bp::int_;
  auto parse_y = +parse_x >> bp::int_;
  auto parse_z = +parse_y >> bp::char_;

  Z z;
  std::string input = "d 2 3 c";

#ifdef WITH_BOOST_SPIRIT
  auto begin = input.begin();
  bool b = bp::phrase_parse(begin, input.end(), parse_z, bp::ascii::space, z);
#else
  auto b = bp::parse(input, parse_z, bp::ws, z);
#endif

  if (b)
    std::cout << ":-)" << std::endl;
  else
    std::cout << ":-(" << std::endl;
}

[akrzemi1]

My next PR will be triple-nested attribute. I am not sure how costly (in terms of runtime performance) this is, but this is based on my real parser, and it used to work in Boost.Spirit.

[tzlaine]

Thanks again for all the great reports, including the reduced code.

I just pushed a fix. It also tests the triple-nested case. I don't expect this to have any runtime cost at all.