diff options
Diffstat (limited to 'util/comparator.cc')
-rw-r--r-- | util/comparator.cc | 40 |
1 files changed, 17 insertions, 23 deletions
diff --git a/util/comparator.cc b/util/comparator.cc index 4b7b5724ef..c5766e9462 100644 --- a/util/comparator.cc +++ b/util/comparator.cc @@ -2,33 +2,34 @@ // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. See the AUTHORS file for names of contributors. -#include <algorithm> -#include <stdint.h> #include "leveldb/comparator.h" + +#include <algorithm> +#include <cstdint> +#include <string> +#include <type_traits> + #include "leveldb/slice.h" -#include "port/port.h" #include "util/logging.h" +#include "util/no_destructor.h" namespace leveldb { -Comparator::~Comparator() { } +Comparator::~Comparator() = default; namespace { class BytewiseComparatorImpl : public Comparator { public: - BytewiseComparatorImpl() { } + BytewiseComparatorImpl() = default; - virtual const char* Name() const { - return "leveldb.BytewiseComparator"; - } + const char* Name() const override { return "leveldb.BytewiseComparator"; } - virtual int Compare(const Slice& a, const Slice& b) const { + int Compare(const Slice& a, const Slice& b) const override { return a.compare(b); } - virtual void FindShortestSeparator( - std::string* start, - const Slice& limit) const { + void FindShortestSeparator(std::string* start, + const Slice& limit) const override { // Find length of common prefix size_t min_length = std::min(start->size(), limit.size()); size_t diff_index = 0; @@ -50,14 +51,14 @@ class BytewiseComparatorImpl : public Comparator { } } - virtual void FindShortSuccessor(std::string* key) const { + void FindShortSuccessor(std::string* key) const override { // Find first character that can be incremented size_t n = key->size(); for (size_t i = 0; i < n; i++) { const uint8_t byte = (*key)[i]; if (byte != static_cast<uint8_t>(0xff)) { (*key)[i] = byte + 1; - key->resize(i+1); + key->resize(i + 1); return; } } @@ -66,16 +67,9 @@ class BytewiseComparatorImpl : public Comparator { }; } // namespace -static port::OnceType once = LEVELDB_ONCE_INIT; -static const Comparator* bytewise; - -static void InitModule() { - bytewise = new BytewiseComparatorImpl; -} - const Comparator* BytewiseComparator() { - port::InitOnce(&once, InitModule); - return bytewise; + static NoDestructor<BytewiseComparatorImpl> singleton; + return singleton.get(); } } // namespace leveldb |