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