// Gimme a better name, please! The abstraction is a thing that // is always used in pairs, where each instance contains some // redundant information in common. auto concept Factorable<typename T> { typename common_data = void; typename unique_data = T;
common_data common(T) {} unique_data unique(T x) { return x; } T reconstruct(common_data, unique_data x) { return x; } };
How is the separation of common_data and unique_data different from a separation of ranges and iterators? If iterators of ranges can rely on their range to exist, this is where common data like functors, end iterators etc. can be stored. Arno -- Dr. Arno Schoedl · aschoedl@think-cell.com Technical Director think-cell Software GmbH · Invalidenstr. 34 · 10115 Berlin, Germany http://www.think-cell.com · phone +49-30-666473-10 · toll-free (US) +1-800-891-8091 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl · Amtsgericht Charlottenburg, HRB 85229