"Eric Niebler" <eric@boost-consulting.com> writes:
One possibility is that facade defines N constructors that take up to N arguments, and just forwards them to inner_. That might work in this narrow case, but what if facade has 2 inner objects of different types? How should constructor arguments get dispatched to the different sub-objects? In general, facade has no way of knowing. Is this a problem others have run into? What sorts of techniques are people using?
Czarnecki and Eisenecker (I think) pioneered the use of tuples for this purpose.
I have come up with a little generic object construction utility using Boost.Parameter that works for me. It allows you to non-intrusively associate named parameters with a type for the purpose of construction, and a way to forward a (possibly filtered) argument pack on to sub-objects. Is there general interest in such a utility?
Neat idea; it's nice to have the by-name interface here. -- Dave Abrahams Boost Consulting www.boost-consulting.com