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QgsFeatureSource::hasFeatures() -> Yes, No, Maybe
This method allows to determine if a feature source has content or not (or maybe). This method works for "generator" sources as well as for "collection" sources. Collection sources like QgsVectorDataProvider which allow to easily and in a cheap way determine if features are available can return FeaturesAvailable or NoFeaturesAvailable, generators will return FeaturesMaybeAvailable. QgsVectorDataProvider also implements an empty() method.
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