Common headers — The common types used by front- and back-ends
This header provides one type, wrap, which is an empty type whose only reason to exist is to be cheap to construct, so that it can be used with mpl::for_each, as shown in the Metaprogramming book, chapter 9.
template <class Dummy> wrap{}; {
}
This header contains the row type tags which front-ends can support partially or totally. Please see the Internals section for a description of the different types.