reference-counted-singleton 0.1.0

Reference-counted singleton whose protected data can be recreated as needed
Documentation 
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# Reference-Counted Singleton

`RefCountedSingleton` is a reference-counted singleton whose protected data
can be recreated as needed.

The protected data is created when `RefCountedSingleton::get_or_init`
is called.
That functions returns an `RCSRef` reference to the singleton.

`RCSRef` instances can be cloned as needed.
The last `RCSRef` reference drops the data.
Calling `RefCountedSingleton::get_or_init` again recreates the data.

## Versioning

This project adheres to [Semantic Versioning].
The `CHANGELOG.md` file details notable changes over time.

[Semantic Versioning]: https://semver.org/spec/v2.0.0.html