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7c673cae | 1 | // Copyright (c) 2011-present, Facebook, Inc. All rights reserved. |
11fdf7f2 TL |
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). | |
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5 | // |
6 | ||
7 | #pragma once | |
8 | ||
11fdf7f2 | 9 | #include "db/dbformat.h" |
7c673cae FG |
10 | #include "table/iterator_wrapper.h" |
11 | ||
f67539c2 | 12 | namespace ROCKSDB_NAMESPACE { |
7c673cae FG |
13 | |
14 | // When used with std::priority_queue, this comparison functor puts the | |
15 | // iterator with the max/largest key on top. | |
16 | class MaxIteratorComparator { | |
17 | public: | |
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18 | MaxIteratorComparator(const InternalKeyComparator* comparator) |
19 | : comparator_(comparator) {} | |
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20 | |
21 | bool operator()(IteratorWrapper* a, IteratorWrapper* b) const { | |
22 | return comparator_->Compare(a->key(), b->key()) < 0; | |
23 | } | |
24 | private: | |
11fdf7f2 | 25 | const InternalKeyComparator* comparator_; |
7c673cae FG |
26 | }; |
27 | ||
28 | // When used with std::priority_queue, this comparison functor puts the | |
29 | // iterator with the min/smallest key on top. | |
30 | class MinIteratorComparator { | |
31 | public: | |
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32 | MinIteratorComparator(const InternalKeyComparator* comparator) |
33 | : comparator_(comparator) {} | |
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34 | |
35 | bool operator()(IteratorWrapper* a, IteratorWrapper* b) const { | |
36 | return comparator_->Compare(a->key(), b->key()) > 0; | |
37 | } | |
38 | private: | |
11fdf7f2 | 39 | const InternalKeyComparator* comparator_; |
7c673cae FG |
40 | }; |
41 | ||
f67539c2 | 42 | } // namespace ROCKSDB_NAMESPACE |