how to make private class member private

[rikki cattermole]

Your thought model is much younger than modules. Modules have existed 
since the mid 70's.
They work, other designs over the years have proven to have faults and 
problems.

D's design is evolved from already existing ideas to try and give the 
best of both worlds and modules is no different.

The reality is, Java and C++ both are great examples where module system 
was added after many years too late. D had it built in from the get go 
and was designed to benefit from it.