NewManager creates a new change list Manager.

NewManagerOptions creates an empty ManagerOptions.

ErrAlreadyCommitted is returned when attempting to commit an already committed ChangeSet.

ErrChangeSetClosed is returned when attempting to make a change to a closed (committed / commit in progress) ChangeSet.

ErrCommitInProgress is returned when attempting to commit a change set that is already being committed.

ErrUnknownVersion is returned when attempting to commit a change for a version that doesn't exist.

A Manager manages sets of changes in a version friendly manager.

ManagerOptions are options used in creating a new ChangeSet Manager.

An ApplyFn applies a set of changes to a configuration, resulting in a new configuration.

A ChangeFn adds a change to an existing set of changes.