Hi all,

Today starts the formal Fast-Track review of the Boost.Utility/Singleton library. This is a very useful utility, so I'm expecting lots of reviews ;)


A Singleton describes a globally accessible and unique facility, typically implemented as a class with inaccessible constructors and a globally accessible function for clients to access a single instance which is created when accessed for the first time.

This library provides three Singleton templates that share an identical interface :

- boost::singleton : can be used to create Singletons with synchronized initialization. If further synchronization is required it has to be implemented by the user.

- boost::mutexed_singleton : additionally ensures that concurrent access to the instance is mutually exclusive. In other words, only one thread can access the instance at a given time.

- boost::thread_specific_singleton : instances exist once per thread.


Tobias Schwinger


Get it from here:

Read documentation online here:

What to include in Review Comments

Your comments may be brief or lengthy, but basically the Review Manager
needs your evaluation of the library. If you identify problems along
the way, please note if they are minor, serious, or showstoppers.

Here are some questions you might want to answer in your review:

* What is your evaluation of the design?
* What is your evaluation of the implementation?
* What is your evaluation of the documentation?
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* Did you try to use the library? With what compiler?
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