Revision 6c2bf9e916db3dc7a43c70f3c0a482b8f7d54bdf authored by Fosco Marotto on 18 April 2019, 17:51:19 UTC, committed by Facebook Github Bot on 18 April 2019, 17:55:01 UTC
Summary: internal task: T35568575 Pull Request resolved: https://github.com/facebook/rocksdb/pull/5199 Differential Revision: D14962794 Pulled By: gfosco fbshipit-source-id: 93838ede6d0235eaecff90d200faed9a8515bbbe
1 parent 392f6d4
iter_heap.h
// 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 {
// 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
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