lazy construction of an immutable object

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On Wednesday, 16 July 2014 at 00:38:46 UTC, Puming wrote:
> 3. define all classes and use template magic to generate 
> companion builders just like protobuffer does. But that would 
> be complicated and I don't know how to do it. Do you have any 
> suggestion for this approach?

This would probably be a good solution, but it will be a bit 
tricky to generate the builder classes. Certainly doable. Take a 
look at std.traits: FieldTypeTuple and RepresentationTypeTuple, 
and the built in __traits(allMembers, <symbol>).