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From: Florian Weimer <fw@s.netic.de>
Subject: Re: Subverting 'Access for Sub-programs
Date: 1999/08/07
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Hyman Rosen <hymie@prolifics.com> writes:

> C++ does allow you to declare a derived class inside a function,
> including new member functions. This only affects visibility, but
> sometimes that's what you want.

There are some limitations, too.  Local classes, as they are called by
the standard, aren't allowed to define static data members.  In additon,
it is impossible to access auto variables in the enclosing function
directly (you have to pass pointers and/or references, which can be
dangerous, or copy the objects, which can be expensive).