virtual bool HasPackages() const = 0;
virtual unsigned long Size() const = 0;
virtual bool Merge(pkgCacheGenerator &/*Gen*/,OpProgress &/*Prog*/) const {return false;};
virtual bool HasPackages() const = 0;
virtual unsigned long Size() const = 0;
virtual bool Merge(pkgCacheGenerator &/*Gen*/,OpProgress &/*Prog*/) const {return false;};