NewIDPool creates and initializes an IDPool.

NewResourcePool creates a new ResourcePool pool.

ErrClosed is returned if ResourcePool is used when it's closed.

ErrTimeout is returned if a resource get times out.

IDPool is used to ensure that the set of IDs in use concurrently never contains any duplicates.

Numbered allows you to manage resources by tracking them with numbers.

ResourcePool allows you to use a pool of resources.

Resource defines the interface that every resource must provide.

Factory is a function that can be used to create a resource.