[c++0x] aligned_union implementation

[CoffeeBuzz <chris dot fairles at gmail dot com>]

Tossed together a aligned_union implementation. I just want to make sure I'm
understanding what its suppose to do. 

  template<typename... _Types>
    struct __largest_alignment;
  
  template<typename _Tp, typename... _Types>
    struct __largest_alignment<_Tp,_Types...> {
        typedef typename conditional< 
            (alignment_of<typename
__largest_alignment<_Types...>::type>::value > alignment_of<_Tp>::value),
                integral_constant<size_t,alignment_of<typename
__largest_alignment<_Types...>::type>::value>,
                integral_constant<size_t,alignment_of<_Tp>::value>>::type
type;
    };
    
  template<typename _Tp>
    struct __largest_alignment<_Tp> {typedef
integral_constant<size_t,alignment_of<_Tp>::value> type;};
  
  template<std::size_t _Len, typename... _Types>
  struct aligned_union {   
    static const size_t alignment_value =
__largest_alignment<_Types...>::type::value; 
    typedef typename aligned_storage<_Len, alignment_value>::type type;
  };

So 'alignment_value' gives the "largest" alignment of all the types. I'm not
sure if "largest" means "most stringent" so correct me if I'm wrong. Now,
for the type I think the above isn't quite correct since it must be "at
least" _Len but if _Len is smaller than the largest in _Types then it should
be sizeof(the largest type) correct?

Chris
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