Geometry Boost List: [geometry] Why reverse_dispatch returns bool rather than mpl::bool_<T> ?

Subject: [geometry] Why reverse_dispatch returns bool rather than mpl::bool_<T> ?
From: Samuel Debionne (samuel.debionne_at_[hidden])
Date: 2014-05-20 10:20:17

Hello all,

It's all in title but the reason I'm asking is that non-type parameter
are not really friendly with mpl metafunction composition. For instance,
a Placeholder Expression requires that :

> All of X's template parameters, including the default ones, are types.

Concrete problem :

I would like to turn the detail::distance::default_strategy into a meta
function class :

mpl::quote5<detail::distance::default_strategy> would do the trick if
the Reverse template parameter was not a non type parameter bool.

Regards,
Samuel