[boost] [MPL] Type detection

From: David B. Held (dheld_at_[hidden])
Date: 2003-10-23 01:53:42

Is it possible to detect whether a template parameter is
an MPL container or not?  I would like to be able to do
something roughly like this:

template <typename T>
struct foo
{
    typedef if_<is_mpl_container<T>::type,
        begin<T>::type,
        T
    >::type my_type;
};

Actually, what I would really like to do is create an array
of objects based on the types in T if T is an MPL container,
and an array of 1 if it's not.  That way, I can say:

foo<int> f;

or:

foo<mpl::list<int, double, char> > f;

Dave

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