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Revision f0879e4c396ab8ffd6246afea9f6400c5098bc12 authored by Daniel Black on 22 February 2017, 00:33:54 UTC, committed by Facebook Github Bot on 22 February 2017, 00:39:14 UTC 
Page size isn't always 4k on linux
 
Summary:
Some places autodetected. These are the two places that didn't.

closes #1498

Still unsure if the following instances of 4 * 1024 need fixing in:
util/io_posix.h
include/rocksdb/table.h (appears to be blocksize and different)
utilities/persistent_cache/block_cache_tier.cc
utilities/persistent_cache/persistent_cache_test.h
include/rocksdb/env.h
util/env_posix.cc
db/column_family.cc
Closes https://github.com/facebook/rocksdb/pull/1499

Differential Revision: D4593640

Pulled By: yiwu-arbug

fbshipit-source-id: efc48de
1 parent 18eeb7b
Raw File
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.
//

#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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