Use std::make_unique when possible (#10578)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/10578

Test Plan: make check

Reviewed By: ajkr

Differential Revision: D39064748

Pulled By: riversand963

fbshipit-source-id: c7c135b7b713608edb14614846050ece6d4cc59d

db/range_del_aggregator.cc

@@ -82,12 +82,6 @@ bool TruncatedRangeDelIterator::Valid() const {
           icmp_->Compare(iter_->parsed_start_key(), *largest_) < 0);
 }
 
-void TruncatedRangeDelIterator::Next() { iter_->TopNext(); }
-
-void TruncatedRangeDelIterator::Prev() { iter_->TopPrev(); }
-
-void TruncatedRangeDelIterator::InternalNext() { iter_->Next(); }
-
 // NOTE: target is a user key
 void TruncatedRangeDelIterator::Seek(const Slice& target) {
   if (largest_ != nullptr &&
@@ -149,9 +143,8 @@ TruncatedRangeDelIterator::SplitBySnapshot(
   std::for_each(
       split_untruncated_iters.begin(), split_untruncated_iters.end(),
       [&](FragmentedIterPair& iter_pair) {
-        std::unique_ptr<TruncatedRangeDelIterator> truncated_iter(
-            new TruncatedRangeDelIterator(std::move(iter_pair.second), icmp_,
-                                          smallest_ikey_, largest_ikey_));
+        auto truncated_iter = std::make_unique<TruncatedRangeDelIterator>(
+            std::move(iter_pair.second), icmp_, smallest_ikey_, largest_ikey_);
         split_truncated_iters.emplace(iter_pair.first,
                                       std::move(truncated_iter));
       });
@@ -322,9 +315,8 @@ void ReadRangeDelAggregator::AddTombstones(
   if (input_iter == nullptr || input_iter->empty()) {
     return;
   }
-  rep_.AddTombstones(
-      std::unique_ptr<TruncatedRangeDelIterator>(new TruncatedRangeDelIterator(
-          std::move(input_iter), icmp_, smallest, largest)));
+  rep_.AddTombstones(std::make_unique<TruncatedRangeDelIterator>(
+      std::move(input_iter), icmp_, smallest, largest));
 }
 
 bool ReadRangeDelAggregator::ShouldDeleteImpl(const ParsedInternalKey& parsed,
@@ -471,19 +463,16 @@ CompactionRangeDelAggregator::NewIterator(const Slice* lower_bound,
                                           const Slice* upper_bound,
                                           bool upper_bound_inclusive) {
   InvalidateRangeDelMapPositions();
-  std::unique_ptr<TruncatedRangeDelMergingIter> merging_iter(
-      new TruncatedRangeDelMergingIter(icmp_, lower_bound, upper_bound,
-                                       upper_bound_inclusive, parent_iters_));
+  auto merging_iter = std::make_unique<TruncatedRangeDelMergingIter>(
+      icmp_, lower_bound, upper_bound, upper_bound_inclusive, parent_iters_);
 
   auto fragmented_tombstone_list =
       std::make_shared<FragmentedRangeTombstoneList>(
           std::move(merging_iter), *icmp_, true /* for_compaction */,
           *snapshots_);
 
-  return std::unique_ptr<FragmentedRangeTombstoneIterator>(
-      new FragmentedRangeTombstoneIterator(
-          fragmented_tombstone_list, *icmp_,
-          kMaxSequenceNumber /* upper_bound */));
+  return std::make_unique<FragmentedRangeTombstoneIterator>(
+      fragmented_tombstone_list, *icmp_, kMaxSequenceNumber /* upper_bound */);
 }
 
 }  // namespace ROCKSDB_NAMESPACE

db/range_del_aggregator.h

@@ -38,10 +38,10 @@ class TruncatedRangeDelIterator {
 
   bool Valid() const;
 
-  void Next();
-  void Prev();
+  void Next() { iter_->TopNext(); }
+  void Prev() { iter_->TopPrev(); }
 
-  void InternalNext();
+  void InternalNext() { iter_->Next(); }
 
   // Seeks to the tombstone with the highest visible sequence number that covers
   // target (a user key). If no such tombstone exists, the position will be at
@@ -281,11 +281,11 @@ class RangeDelAggregator {
       const InternalKey* smallest = nullptr,
       const InternalKey* largest = nullptr) = 0;
 
-  bool ShouldDelete(const Slice& key, RangeDelPositioningMode mode) {
+  bool ShouldDelete(const Slice& ikey, RangeDelPositioningMode mode) {
     ParsedInternalKey parsed;
 
     Status pik_status =
-        ParseInternalKey(key, &parsed, false /* log_err_key */);  // TODO
+        ParseInternalKey(ikey, &parsed, false /* log_err_key */);  // TODO
     assert(pik_status.ok());
     if (!pik_status.ok()) {
       return false;

db/range_tombstone_fragmenter.cc

@@ -67,8 +67,8 @@ FragmentedRangeTombstoneList::FragmentedRangeTombstoneList(
                         unfragmented_tombstones->value().size());
   }
   // VectorIterator implicitly sorts by key during construction.
-  auto iter = std::unique_ptr<VectorIterator>(
-      new VectorIterator(std::move(keys), std::move(values), &icmp));
+  auto iter = std::make_unique<VectorIterator>(std::move(keys),
+                                               std::move(values), &icmp);
   FragmentTombstones(std::move(iter), icmp, for_compaction, snapshots);
 }
 
@@ -433,9 +433,8 @@ FragmentedRangeTombstoneIterator::SplitBySnapshot(
       upper = snapshots[i];
     }
     if (tombstones_->ContainsRange(lower, upper)) {
-      splits.emplace(upper, std::unique_ptr<FragmentedRangeTombstoneIterator>(
-                                new FragmentedRangeTombstoneIterator(
-                                    tombstones_, *icmp_, upper, lower)));
+      splits.emplace(upper, std::make_unique<FragmentedRangeTombstoneIterator>(
+                                tombstones_, *icmp_, upper, lower));
     }
     lower = upper + 1;
   }