for each of tuple

tuple_foreach.hpp

#pragma once

#include<tuple>

namespace deteil{
template<class Tuple,class Visitor>
class _tuple_foreach
{
public:
  void operator()(Tuple & tuple, Visitor& visitor)
	{
		loop<0>(visitor,tuple);
	}
private:
	static const size_t N = std::tuple_size<Tuple>::value;

	template<size_t i>
	void loop(Visitor &visitor, Tuple & tuple)
	{
		visitor(std::get<i>(tuple));
		loop<i + 1>(visitor,tuple);
	}

	template<>
	void loop<N>(Visitor& visitor, Tuple & tuple){}
};

}

template<class Tuple,class Visitor>
Visitor& tuple_foreach(Tuple&tuple, Visitor&visitor)
{
	deteil::_tuple_foreach<Tuple, Visitor> x;
	x(tuple,visitor);
	return visitor;
}