[Development] RFC: RAII for property changes

[Keith Gardner]

>
> I'd certainly be interested to seeing how you solved this, yes. Thanks!
>

I have made a repository for the class with an example.  Sorry that there
is no documentation for it.  It requires C++11 support for r-value
references, std::functional, and some type traits features.  In addition to
having a notify callback, it also provides an optional pre-notify callback
to let you know the current value and the value it will change to.

https://github.com/kreios4004/Property_Class
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