This interface is the interface implemented for all counter types. A Counter can represent a real counter or a virtual counter that will be computed using one or more other counters.
Real counters
are counters which represent real values. The user will call methods of such counters to modify the associated value of the counter.
Computed counters
are computed using one or more associated counters. Such counters represent operations computed on associated counters. Usually, these counters will never be used directly, but will only used to retrieve the computed values.
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