141 struct SparseTensorCOO final {  struct
143   SparseTensorCOO(const std::vector<uint64_t> &dimSizes, uint64_t capacity)  in SparseTensorCOO()  function
152   void add(const std::vector<uint64_t> &ind, V val) {  in add()
178   void sort() {  in sort()
195   uint64_t getRank() const { return dimSizes.size(); }  in getRank()
198   const std::vector<uint64_t> &getDimSizes() const { return dimSizes; }  in getDimSizes()
201   const std::vector<Element<V>> &getElements() const { return elements; }  in getElements()
204   void startIterator() {  in startIterator()
210   const Element<V> *getNext() {  in getNext()
224   static SparseTensorCOO<V> *newSparseTensorCOO(uint64_t rank,  in newSparseTensorCOO()
237   const std::vector<uint64_t> dimSizes; // per-dimension sizes
238   std::vector<Element<V>> elements;     // all COO elements
239   std::vector<uint64_t> indices;        // shared index pool
240   bool iteratorLocked = false;
241   unsigned iteratorPos = 0;