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diff --git a/src/msg/async/dpdk/array_map.h b/src/msg/async/dpdk/array_map.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright (C) 2014 Cloudius Systems, Ltd.
+ */
+
+#ifndef CEPH_ARRAY_MAP_HH_
+#define CEPH_ARRAY_MAP_HH_
+
+#include <array>
+
+// unordered_map implemented as a simple array
+
+template <typename Value, size_t Max>
+class array_map {
+  std::array<Value, Max> _a {};
+ public:
+  array_map(std::initializer_list<std::pair<size_t, Value>> i) {
+    for (auto kv : i) {
+      _a[kv.first] = kv.second;
+    }
+  }
+  Value& operator[](size_t key) { return _a[key]; }
+  const Value& operator[](size_t key) const { return _a[key]; }
+
+  Value& at(size_t key) {
+    if (key >= Max) {
+      throw std::out_of_range(std::to_string(key) + " >= " + std::to_string(Max));
+    }
+    return _a[key];
+  }
+};
+
+#endif /* ARRAY_MAP_HH_ */