Though there is some difference between null and void, MPL provides a void
type. http://www.boost.org/doc/libs/1_54_0/libs/mpl/doc/refmanual/void.html
I think there may also be some type "na" or something to that effect used
to fill empty elements of a sequence to work around the lack of variadic
templates in C++03, but I couldn't find the exact reference in a cursory
search.
Cheers!
Andrew Hundt
On Sat, Jul 13, 2013 at 7:56 AM, Bjorn Reese
It seems like different Boost libraries use different nullable types.
* Optional uses boost::none * Tribool uses boost::logic::indeterminate_**keyword_t * Tuple uses boost::tuples::null_type * Variant uses boost::blank
And there are possibly more.
What are your opinions about unifying these?
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