[boost] [MultiIndex] Why do constructions of multi_indx_base_type<> and multi_index_node_type<> differ?

From: Grzegorz Jakacki (jakackipub_at_[hidden])
Date: 2008-05-23 11:00:54

Hello,

I have a question about implementation details of MultiIndex.

The type multi_index_base_type<> is created with the metafunction
nth_layer<>, which in turn uses mpl::eval_if_c<> and mpl::apply2<> to
build the type by recursion.

The construction of the type multi_index_node_type<> is very similar,
but it is implemented in more succinct way using
mpl::reverse_iter_fold<> and mpl::bind2<>.

I am trying to find out whether there are reasons to keep the
more complex construction for multi_index_base_type<>,
your input will be appreciated.

Thank you
Greg