#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ranked_index.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/container/flat_set.hpp>


struct multi_index_thing
{
	int a;
	int b;
	int c;
};

typedef boost::multi_index::multi_index_container<
	multi_index_thing,
	boost::multi_index::indexed_by<
		boost::multi_index::ranked_non_unique<
			boost::multi_index::member<multi_index_thing, int, &multi_index_thing::a>,
			std::less<int>
		>,
		boost::multi_index::ranked_non_unique<
			boost::multi_index::member<multi_index_thing, int, &multi_index_thing::b>,
			std::less<int>
		>,
		boost::multi_index::ranked_non_unique<
			boost::multi_index::member<multi_index_thing, int, &multi_index_thing::c>,
			std::less<int>
		>
	>
> MultiIndex;

int main() {
	MultiIndex multi_index;
	auto& a_index = multi_index.get<0>();
	a_index.upper_bound_rank(0);
	auto& b_index = multi_index.get<1>();
	b_index.upper_bound_rank(0);
	auto& c_index = multi_index.get<2>();
	c_index.upper_bound_rank(0);
}