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== Implementation ==
Object pools can be implemented in an automated fashion in languages like C++ via [[Smart pointer|smart pointers]]. In the constructor of the smart pointer - an object can be requested from the pool and in the destructor of the smart pointer - the object can be released back to the pool. In garbage collected languages, where there are no destructors (which are guaranteed to be called as part of a stack unwind) - object pools MUST be implemented in a manual fashion, by explicitly requesting an object from the [[Factory (object-oriented programming)|factory]] and returning the object by calling a dispose method (as in the [[dispose pattern]]). Using a [[finalizer]] to do this is not a good idea as there are usually no guarantees on when (or if ever) the finalizer will be run. Instead - prefer using try ... finally to ensure that getting and releasing the object is exception neutral.
Manual object pools are simple to implement, but harder to use, as they require [[manual memory management]] of pool objects.
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