Function add

src/ArduinoJson/Memory/StringPool.hpp:45–64

  template <typename TAdaptedString>
  StringNode* add(TAdaptedString str, Allocator* allocator) {
    ARDUINOJSON_ASSERT(str.isNull() == false);

    auto node = get(str);
    if (node) {
      node->references++;
      return node;
    }

    size_t n = str.size();

    node = StringNode::create(n, allocator);
    if (!node)
      return nullptr;

    stringGetChars(str, node->data, n);
    node->data[n] = 0;  // force NUL terminator
    add(node);
    return node;
  }

  void add(StringNode* node) {
    ARDUINOJSON_ASSERT(node != nullptr);