int main()
{
	std::vector<int> v1{ 1, 2 ,3, 4, 5, 6, 7, 8, 9, 10 };
	std::vector<int*> v2;

	std::copy_if(v1.begin(), v1.end(), back_ref_inserter(v2), [](int i) {
		return i % 2 == 0;
	});
}

template<class T>
class back_ref_iterator : public std::back_insert_iterator<T>
{
public:
	_Myt& operator=(const _Valty& _Val)
	{	// push value into container
		container->push_back(&_Val);
		return (*this);
	}
};

template<class _Container> inline
back_ref_iterator<_Container> back_ref_inserter(_Container& _Cont)
{	// return a back_insert_iterator
	return (back_ref_iterator<_Container>(_Cont));
}