ceph/src/rocksdb/util/kv_map.h

   1 //  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5 #pragma once
   6
   7 #include <map>
   8 #include <string>
   9
  10 #include "rocksdb/comparator.h"
  11 #include "rocksdb/slice.h"
  12 #include "util/coding.h"
  13
  14 namespace ROCKSDB_NAMESPACE {
  15 namespace stl_wrappers {
  16
  17 struct LessOfComparator {
  18   explicit LessOfComparator(const Comparator* c = BytewiseComparator())
  19       : cmp(c) {}
  20
  21   bool operator()(const std::string& a, const std::string& b) const {
  22     return cmp->Compare(Slice(a), Slice(b)) < 0;
  23   }
  24   bool operator()(const Slice& a, const Slice& b) const {
  25     return cmp->Compare(a, b) < 0;
  26   }
  27
  28   const Comparator* cmp;
  29 };
  30
  31 using KVMap = std::map<std::string, std::string, LessOfComparator>;
  32 }  // namespace stl_wrappers
  33 }  // namespace ROCKSDB_NAMESPACE