Reflections on Serialization APIs in D

["Nordlöw"]

In the road to develop a new kind of search engine that caches 
types, statistics, etc about files and directories I'm currently 
trying to implement persistent caching of my internal directory 
tree using `msgpack-d`:

Why doesn't `msgpack-d` and, from what I can see also, 
`std.serialization` (Orange) support implementing *both* packing 
and unpacking through one common template (member) function 
overload like **Boost.Serialization** does?. For example 
containers can be handled using this concise and elegant syntax 
in C++11:

         friend class boost::serialization::access;
         template<class Ar> void serialize(Ar& ar, const uint 
version) {
             for (const auto& e : *this) { ar & e; }
         }

This halves the code size aswell as removes the risk of making 
the `pack` and `unpack` go out of sync.