from display_wallet.h and display_wallet.cpp
They are now all wrapped in the long promised
and long forgotten wrapper class.
Long, long ago, I intended to implement the Pimpl idiom,
but these days std::unique takes care of all that work for
you. You just wrap your low level pimple class in a high
level wrapper whose base class is an std_unique_ptr to
to an instance of your low level class.
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