Please consider this addition for tuples in c++0x

Hello. I would like to propose a small addition to the tuple class
template in c++0x. I'm surprised I didn't
see this in any proposal, since it's gonna give us more than a
headache (I think) if it's not included.
Since the tuple class template is a container, it would be very useful
to be able to loop over
each element in the tuple. This is not easy, since that requires
metaprogramming.

A good small addition would be to do something like this:

struct do_something
{
       template <class T>
       void operator()(const T & elem)
       {
          //...
       }
};

int main()
{
     tuple<int, float, std::string> t(3, 2.38f, "hello");

    tuple_elem_each(t, do_something());
}

I recommend this or a similar thing to be included. Because looping a
tuple in a manual way is difficult.

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