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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-21 11:54:28 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-21 11:54:28 +0000
commite6918187568dbd01842d8d1d2c808ce16a894239 (patch)
tree64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/table/iter_heap.h
parentInitial commit. (diff)
downloadceph-e6918187568dbd01842d8d1d2c808ce16a894239.tar.xz
ceph-e6918187568dbd01842d8d1d2c808ce16a894239.zip
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/table/iter_heap.h')
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1 files changed, 44 insertions, 0 deletions
diff --git a/src/rocksdb/table/iter_heap.h b/src/rocksdb/table/iter_heap.h
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+// 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 "db/dbformat.h"
+#include "table/iterator_wrapper.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+// When used with std::priority_queue, this comparison functor puts the
+// iterator with the max/largest key on top.
+class MaxIteratorComparator {
+ public:
+ MaxIteratorComparator(const InternalKeyComparator* comparator)
+ : comparator_(comparator) {}
+
+ bool operator()(IteratorWrapper* a, IteratorWrapper* b) const {
+ return comparator_->Compare(a->key(), b->key()) < 0;
+ }
+
+ private:
+ const InternalKeyComparator* comparator_;
+};
+
+// When used with std::priority_queue, this comparison functor puts the
+// iterator with the min/smallest key on top.
+class MinIteratorComparator {
+ public:
+ MinIteratorComparator(const InternalKeyComparator* comparator)
+ : comparator_(comparator) {}
+
+ bool operator()(IteratorWrapper* a, IteratorWrapper* b) const {
+ return comparator_->Compare(a->key(), b->key()) > 0;
+ }
+
+ private:
+ const InternalKeyComparator* comparator_;
+};
+
+} // namespace ROCKSDB_NAMESPACE