[boost] Re: Infinite number of parameters?

From: Philippe A. Bouchard (philippe_at_[hidden])
Date: 2003-08-05 12:09:20

Brock Peabody wrote:
> That's a cool idea.  It's a lot prettier than using the preprocessor.

Thanks, Brock.

> Does anyone know whether or not a language solution is being
> considered
> for this or variable class template arguments?

It would be valueable for expressions only, not declarator lists.  But in
general those infinite parameters function instanciations happens mostly for
function overloading.

[...]

>> int main()
>> {
>>  foo((infinite::begin, true, (char *) "adasd", 12367, 127.2));
>> }

The previous syntax or the following by using a px() helper which would
generate another type:

template <typename T>
    struct p_t
    {
        T const & t;

        ...
    };

template <typename T>
    p_t<T> px(T const & p)
    {
        return p_t<T>(p);
    }

template <...>
    infinite< V, infinite<T, U> > operator , (infinite<T, U> const & u,
p_t<V> const & p)
    {
        return infinite< V, infinite<T, U> >(u, p.t);
    }

...

int main()
{
    foo((px(true), px((char *) "adasd"), px(12367), px(127.2)));
}

My 0,03$

Philippe