std::atomic<int32_t> gNodeInstanceCount(0);
std::atomic<int32_t> gConfigInstanceCount(0);

struct YGNode {
...
  // We must setChildRoot() for new child
  void replaceChild(YGNodeRef oldChild, YGNodeRef newChild);
  void replaceChild(YGNodeRef child, uint32_t index);
  void insertChild(YGNodeRef child, uint32_t index);
...
  private:
    YGNodeRef pRoot = nullptr;

  public:
    uint32_t  gCurrentGenerationCount = 0;
    uint32_t  gDepth = 0;
    YGNodeRef getRoot();
    void setChildRoot(YGNodeRef node);
}
...
void YGNode::setChildRoot(YGNodeRef node) {
  node->pRoot = getRoot();
  for (auto child: node->children_) {
    setChildRoot(child);
  }
}

//gCurrentGenerationCount++;
node->getRoot()->gCurrentGenerationCount++;

//gDepth++;
node->getRoot()->gDepth++;