On 02/28/2005 01:56 AM, David Abrahams wrote:
types). fold and reverse_fold don't even have to _return_ sequences.
Which is what I'm trying to remedy. I need this because I would like to use for_each on the result of a fold invokation.
I can't understand why you're not using Fusion, or at least trying to fit into the Fusion framework
Maybe the visitor.hpp in sand-box vault will illustrate. I found it convenient to define field_sets, and then make it the base class of visits_fields<VisitorId> for VisitorId in visitor_numerals (an enumeration). IIUC, fusion tuples, if it's like the existing boost tuple, takes a sequence of types and produces a type; yet, that wouldn't make field_sets the base type. I need something where the base type (corresponding to the default empty_base for inherit_linearly), is user-specified, and tuples doesn't work.