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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 | ||
6 | #pragma once | |
7 | ||
1e59de90 TL |
8 | #include "rocksdb/comparator.h" |
9 | ||
f67539c2 | 10 | namespace ROCKSDB_NAMESPACE { |
11fdf7f2 TL |
11 | // A comparator to be used in std::set |
12 | struct SetComparator { | |
13 | explicit SetComparator() : user_comparator_(BytewiseComparator()) {} | |
14 | explicit SetComparator(const Comparator* user_comparator) | |
15 | : user_comparator_(user_comparator ? user_comparator | |
16 | : BytewiseComparator()) {} | |
17 | bool operator()(const Slice& lhs, const Slice& rhs) const { | |
18 | return user_comparator_->Compare(lhs, rhs) < 0; | |
19 | } | |
20 | ||
21 | private: | |
22 | const Comparator* user_comparator_; | |
23 | }; | |
f67539c2 | 24 | } // namespace ROCKSDB_NAMESPACE |