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+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_COMPILER_RUBY_GENERATOR_MAP_INL_H
+#define GRPC_INTERNAL_COMPILER_RUBY_GENERATOR_MAP_INL_H
+
+#include "src/compiler/config.h"
+
+#include <iostream>
+#include <initializer_list>
+#include <map>
+#include <ostream>  // NOLINT
+#include <vector>
+
+using std::initializer_list;
+using std::map;
+using std::vector;
+
+namespace grpc_ruby_generator {
+
+// Converts an initializer list of the form { key0, value0, key1, value1, ... }
+// into a map of key* to value*. Is merely a readability helper for later code.
+inline std::map<grpc::string, grpc::string> ListToDict(
+    const initializer_list<grpc::string> &values) {
+  if (values.size() % 2 != 0) {
+    std::cerr << "Not every 'key' has a value in `values`."
+              << std::endl;
+  }
+  std::map<grpc::string, grpc::string> value_map;
+  auto value_iter = values.begin();
+  for (unsigned i = 0; i < values.size() / 2; ++i) {
+    grpc::string key = *value_iter;
+    ++value_iter;
+    grpc::string value = *value_iter;
+    value_map[key] = value;
+    ++value_iter;
+  }
+  return value_map;
+}
+
+}  // namespace grpc_ruby_generator
+
+#endif  // GRPC_INTERNAL_COMPILER_RUBY_GENERATOR_MAP_INL_H