Revision 8e6345d2df40756c5ef62f3190cb152058fec890 authored by Maysam Yabandeh on 25 June 2017, 01:07:34 UTC, committed by Facebook Github Bot on 25 June 2017, 01:12:03 UTC
Summary: Closes https://github.com/facebook/rocksdb/pull/2494 Differential Revision: D5317902 Pulled By: maysamyabandeh fbshipit-source-id: 097330292180816b3d0c9f4cbbdb6f68f0180200
1 parent 499ebb3
iter_heap.h
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.
//
#pragma once
#include "rocksdb/comparator.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 Comparator* comparator) :
comparator_(comparator) {}
bool operator()(IteratorWrapper* a, IteratorWrapper* b) const {
return comparator_->Compare(a->key(), b->key()) < 0;
}
private:
const Comparator* 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 Comparator* comparator) :
comparator_(comparator) {}
bool operator()(IteratorWrapper* a, IteratorWrapper* b) const {
return comparator_->Compare(a->key(), b->key()) > 0;
}
private:
const Comparator* comparator_;
};
} // namespace rocksdb
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