YugabyteDB (2.13.1.0-b60, 21121d69985fbf76aa6958d8f04a9bfa936293b5)

//  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.

//

// The following only applies to changes made to this file as part of YugaByte development.

//

// Portions Copyright (c) YugaByte, Inc.

//

// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except

// in compliance with the License.  You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software distributed under the License

// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

// or implied.  See the License for the specific language governing permissions and limitations

// under the License.

//

#pragma once

#include "yb/rocksdb/comparator.h"

#include "yb/rocksdb/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