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node_modules/react-native/React/Fabric/Utils/RCTIdentifierPool.h

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <bitset>
+
+namespace facebook::react {
+
+template <size_t size>
+class RCTIdentifierPool {
+ public:
+  void enqueue(int index)
+  {
+    usage[index] = false;
+  }
+
+  int dequeue()
+  {
+    while (true) {
+      if (!usage[lastIndex]) {
+        usage[lastIndex] = true;
+        return lastIndex;
+      }
+      lastIndex = (lastIndex + 1) % size;
+    }
+  }
+
+  void reset()
+  {
+    for (int i = 0; i < size; i++) {
+      usage[i] = false;
+    }
+  }
+
+ private:
+  std::bitset<size> usage;
+  int lastIndex;
+};
+
+} // namespace facebook::react