The boost tuple documentation says:
The current version supports tuples with 0-10 elements. If necessary, the upper limit can be increased up to, say, a few dozen elements.
However, I could not find where it says how to do this.
I would like the tuple to have BOOST_MPL_LIMIT_VECTOR_SIZE elements (20 by default). This is because I am mapping between mpl::vectors and boost::tuples and would like all the containers to have the same number of elements.