Select every even (or odd) argument in template parameter pack

Though the code got a little lengthy, I suppose the mechanism doesn't have unnecessary peculiarities.
If I understand the question correctly, probably the following code will meet the purpose:

// push front for tuple
template< class, class > struct PFT;

template< class A, class... T > struct PFT< A, tuple< T... > > {
  typedef tuple< A, T... > type;
};

// for even
template< class... > struct even_tuple;

template< class A, class B > struct even_tuple< A, B > {
  typedef tuple< A > type;
};
template< class A, class B, class... T > struct even_tuple< A, B, T... > {
  typedef typename PFT< A, typename even_tuple< T... >::type >::type type;
};
// As for odd elements, in the same way as even(please see the test on ideone)

// objective type
template< class > struct storage_type;

template< class... T > struct storage_type< tuple< T... > > {
  typedef tuple< vector< T >... > type;
};

template< class... T >
struct MyClass {
  typename storage_type< typename even_tuple< T... >::type >::type
    m_storage_even_;
  typename storage_type< typename  odd_tuple< T... >::type >::type
    m_storage_odd_;
};

Here is a test on ideone.

Perhaps something like this:

#include <tuple>

// Example receptacle    
template <typename ...Args> struct MyContainer;

// Tuple concatenator
template<typename PackR, typename PackL> struct cat;
template<typename ...R, typename ...L>
struct cat<std::tuple<R...>, std::tuple<L...>>
{
  typedef std::tuple<R..., L...> type;
};

// Even/Odd extractors
template <typename ...Args> struct GetEven;
template <typename ...Args> struct GetOdd;

template <typename E1, typename O1, typename ...Args>
struct GetEven<E1, O1, Args...>
{
  typedef typename cat<std::tuple<E1>, typename GetEven<Args...>::value>::type value;
};
template <typename E1, typename O1>
struct GetEven<E1, O1>
{
  typedef std::tuple<E1> value;
};

template <typename E1, typename O1, typename ...Args>
struct GetOdd<E1, O1, Args...>
{
  typedef typename cat<std::tuple<O1>, typename GetEven<Args...>::value>::type value;
};
template <typename E1, typename O1>
struct GetOdd<E1, O1>
{
  typedef std::tuple<O1> value;
};

// Tuple-to-Receptacle mover
template <typename Pack, template <typename ...T> class Receiver> struct Unpack;
template <typename ...Args, template <typename ...T> class Receiver>
struct Unpack<std::tuple<Args...>, Receiver>
{
  typedef Receiver<Args...> type;
};

// Example consumer
template <typename ...Args>
struct Foo
{
  typedef typename Unpack<typename GetEven<Args...>::value, MyContainer>::type EvenVector;
  typedef typename Unpack<typename GetOdd<Args...>::value, MyContainer>::type OddVector;

  EvenVector x;
  OddVector y;
};

You still have to define your MyContainer class to do something useful with the variadic parameters, e.g. implement your tuple of vectors... (why not a vector of tuples, though?)

Credits to brunocodutra for the tuple trick.