[Boost-users] Get fields from struct

13 Jan 2012

      Hello all,

I'm currently busy to get things like this working:

struct person {
  std::string name;
  int age;
};

int main(int argc, char **argv) {

  person p;
  p.name = "Matthijs"
  p.age = 1234;

  std::string key = "name";

  // Now try to fetch the value based on the key string.
  std::cout << p.{key} << std::endl; // does not compile

  return 0;
}

Of course above doesn't work for obvious reasons.

The closest I get is:

struct person {
	std::string name;
	int age;
};

namespace keys {
	struct name;
	struct age;
}

BOOST_FUSION_ADAPT_ASSOC_STRUCT(
	person,
	(std::string, name, keys::name)
	(int, age, keys::age)
);

int main(int argc, char **argv) {

	person x;
	x.name = "Matthijs";
	x.age = 1234;

	std::cout << "Name: " << boost::fusion::at_keykeys::name(x) << std::endl;
	std::cout << "Age:  " << boost::fusion::at_keykeys::age(x) << std::endl;

	return 0;
}

Now my question, is there maybe another way to achieve this?

Regards,

Matthijs Möhlmann
Cacholong