}
	if quota.Spec.ScopeSelector != nil {
		selectors = append(selectors, quota.Spec.ScopeSelector.MatchExpressions...)
	}
	return selectors
}

// CalculateUsageStats is a utility function that knows how to calculate aggregate usage.
func CalculateUsageStats(options quota.UsageStatsOptions,
	listFunc ListFuncByNamespace,
	scopeFunc MatchesScopeFunc,
	usageFunc UsageFunc) (quota.UsageStats, error) {

	return PodUsageFunc(item, p.clock)
}

// UsageStats calculates aggregate usage for the object.
func (p *podEvaluator) UsageStats(options quota.UsageStatsOptions) (quota.UsageStats, error) {
	return generic.CalculateUsageStats(options, p.listFuncByNamespace, podMatchesScopeFunc, p.Usage)
}

// verifies we implement the required interface.
var _ quota.Evaluator = &podEvaluator{}