[boost] Re: [MPL] Type detection

From: David B. Held (dheld_at_[hidden])
Date: 2003-10-23 14:24:18

"Joel de Guzman" <joel_at_[hidden]> wrote in message
news:02b501c3994b$a8625780$64646464_at_godzilla...
> [...]
> The Fusion lib (in the sandbox) hopefully to replace the old tuple
> lib can do that easily (example):
>
>         typedef boost::mpl::list<int, double, X, int> mpl_list1;
>         type_sequence<mpl_list1> view;
>         std::cout << generate(view) << std::endl;
>
> generate(view) creates a tuple from the view.

This looks promising, but could you briefly explain what a view
is?  And can I just create my tuple directly from the sequence?
Like so:

template <typename T>
struct foo
{
    typedef typename as_sequence<T>::type my_types;

    foo(void) : my_tuple(generate(type_sequence<my_types>())) { }

    tuple<???> my_tuple;
};

Remember that I'm trying to get to here:

get<3>(foo().my_tuple);

That is, I want to be able to access the individual tuple elements
at run-time.  So if there's a better way to do that in fusion, then
I'm all ears.

Dave

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