[boost] Userfriendly interaction of tuples with mpl containers

From: nee Spangenberg (dsp_at_[hidden])
Date: 2004-01-14 10:12:55

Hi boosters,

I am just doing first steps in using the boost::mpl library, which is
really great.
Obviously due to my ignorance of knowing it not better, I tried the
following:

#include <boost/mpl/vector.hpp>
#include <boost/mpl/size.hpp>
#include <boost/mpl/void.hpp>
#include <boost/tuple/tuple.hpp>

template<
    typename T0 = boost::mpl::void_, typename T1 = boost::mpl::void_,
    typename T2 = boost::mpl::void_, typename T3 = boost::mpl::void_,
    typename T4 = boost::mpl::void_, typename T5 = boost::mpl::void_,
    typename T6 = boost::mpl::void_, typename T7 = boost::mpl::void_,
    typename T8 = boost::mpl::void_, typename T9 = boost::mpl::void_
    >
class Test
{
    typedef boost::mpl::vector<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>
        InternalTypeContainer;

    typedef boost::tuples::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>
Tuples; // Fragile code!!
    Tuples m_Tuple;
};

typedef Test<double, char, bool> MyTypes;

As you will belief, that will not compile successfully, because
boost::mpl::void_ is
an undefined type (similar to void) and I am trying to fill my tuple
partially with undefined
types. So my problem is:

Does there exist a boost::mpl way (?) to define my
boost::tuples::tuple<> inside the given
Test class template until the last non-mpl::void_ is filled into it?
(Iteration until end??)

Or does their exist another tuple class, which I should try to use at
this place?

Shamefully I have to confess that I have to cope with the VC6 compiler
here....

Thank you very much for your ideas,

Daniel