#ifndef PFOR_PFOR_TUPLE_VIEW_H
#define PFOR_PFOR_TUPLE_VIEW_H

#include <cstdio>

#include <tuple>

#include "mp/meta.h"
#include "mp/pack.h"

namespace pfor {

template<typename, typename> class TupleView;

template<typename... Ts, std::size_t... indices>
class TupleView<std::tuple<Ts...>, Pack<UIntToType<indices>...>> {
public:
	using Tuple = std::tuple<Ts...>;
	using View  = Pack<UIntToType<indices>...>;

private:
	Tuple& _tuple;

public:
	TupleView(Tuple& tuple): _tuple{tuple} {}

	template<std::size_t index>
	decltype(auto) get() {
		return std::get<PackGet<View, index>::value>(_tuple);
	}

	template<std::size_t index>
	decltype(auto) get() const {
		return std::get<PackGet<View, index>::value>(_tuple);
	}
};

template<typename... Ts, std::size_t... indices>
auto makeTupleView(std::tuple<Ts...>& tuple, Pack<UIntToType<indices>...>) {
	return TupleView<std::tuple<Ts...>, Pack<UIntToType<indices>...>>{tuple};
}

}

namespace std {

template<std::size_t index, typename Tuple, typename View>
constexpr decltype(auto) get(pfor::TupleView<Tuple, View>& tupleView) {
	return tupleView.template get<index>();
}

template<std::size_t index, typename Tuple, typename View>
constexpr decltype(auto) get(pfor::TupleView<Tuple, View> const& tupleView) {
	return tupleView.template get<index>();
}

}

#endif