observer_ptr<T>
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Description
There was much disagreement on the future of [`std::observer_ptr`](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/n4786.html#memory.observer.ptr.overview) during the WG21 Cologne meeting this summer ([objection against moving it into the standard](https://wg21.link/p1408r0), but no consensus for dropping it from the library fundamentals TS3). So maybe Boost is the right place for this handy little utility.
What are your thoughts? Would you accept a PR adding `observer_ptr` to Boost.SmartPtr?
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