1 files changed, 33 insertions, 0 deletions
diff --git a/src/rocksdb/util/kv_map.h b/src/rocksdb/util/kv_map.h
new file mode 100644
index 000000000..62be6d18e
--- /dev/null
+++ b/src/rocksdb/util/kv_map.h
@@ -0,0 +1,33 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+#pragma once
+
+#include <map>
+#include <string>
+
+#include "rocksdb/comparator.h"
+#include "rocksdb/slice.h"
+#include "util/coding.h"
+
+namespace ROCKSDB_NAMESPACE {
+namespace stl_wrappers {
+
+struct LessOfComparator {
+  explicit LessOfComparator(const Comparator* c = BytewiseComparator())
+      : cmp(c) {}
+
+  bool operator()(const std::string& a, const std::string& b) const {
+    return cmp->Compare(Slice(a), Slice(b)) < 0;
+  }
+  bool operator()(const Slice& a, const Slice& b) const {
+    return cmp->Compare(a, b) < 0;
+  }
+
+  const Comparator* cmp;
+};
+
+using KVMap = std::map<std::string, std::string, LessOfComparator>;
+}  // namespace stl_wrappers
+}  // namespace ROCKSDB_NAMESPACE