Boost mpl has sequences composed of integral constants:

http://www.boost.org/doc/libs/1_39_0/libs/mpl/doc/refmanual/integral-sequence-wrapper.html

Why couldn't this be implemented with variadic templates something
like:

   template<class T, T... C>
   struct SEQ_c
   : SEQ<integral_c<T,C>...>
   {};

?  I tried compiling something like this; however, I got
a compile error:

   error: parameter packs not expanded with '...':

However, when the T in the expansion was replaced with a constant
type, e.g. int, the expansion worked.

Code illustrating the problem is in the boost vault under
variadic_templates:

   http://www.boostpro.com/vault/index.php?&directory=variadic_templates

in file:

   list_c_expansion_wish.cpp

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