union and casting -> memcpy

explicit constructors.
T -> ChecksumType.

3 files changed, 10 insertions, 13 deletions

diff --git a/searchcore/src/tests/proton/documentmetastore/documentmetastore_test.cpp b/searchcore/src/tests/proton/documentmetastore/documentmetastore_test.cpp
index 7e16094bbf1..42d038e6b88 100644
--- a/searchcore/src/tests/proton/documentmetastore/documentmetastore_test.cpp
+++ b/searchcore/src/tests/proton/documentmetastore/documentmetastore_test.cpp
@@ -774,7 +774,7 @@ TEST("requireThatWeCanSortGids")
     }
 }
 
-template <typename T>
+template <typename ChecksumType>
 void
 requireThatBasicBucketInfoWorks()
 {
@@ -813,7 +813,7 @@ requireThatBasicBucketInfoWorks()
         m.erase(std::make_pair(bucketId, gid));
     }
     assert(!m.empty());
-    T cksum(BucketChecksum(0));
+    ChecksumType cksum(BucketChecksum(0));
     BucketId prevBucket = m.begin()->first.first;
     uint32_t cnt = 0u;
     uint32_t maxcnt = 0u;
diff --git a/searchcore/src/vespa/searchcore/proton/bucketdb/checksumaggregators.cpp b/searchcore/src/vespa/searchcore/proton/bucketdb/checksumaggregators.cpp
index f56d29bb82d..a118f416b6b 100644
--- a/searchcore/src/vespa/searchcore/proton/bucketdb/checksumaggregators.cpp
+++ b/searchcore/src/vespa/searchcore/proton/bucketdb/checksumaggregators.cpp
@@ -12,14 +12,10 @@ using GlobalId = ChecksumAggregator::GlobalId;
 namespace {
 
 uint32_t
-gidChecksum(const document::GlobalId &gid)
+gidChecksum(const GlobalId &gid)
 {
-    union {
-        const unsigned char *_c;
-        const uint32_t *_i;
-    } u;
-    u._c = gid.get();
-    const uint32_t *i = u._i;
+    uint32_t i[3];
+    memcpy(i, gid.get(), GlobalId::LENGTH);
     return i[0] + i[1] + i[2];
 }
 
@@ -106,8 +102,9 @@ XXH64ChecksumAggregator::empty() const { return _checksum == 0; }
 uint64_t
 XXH64ChecksumAggregator::compute(const GlobalId &gid, const Timestamp &timestamp) {
     char buffer[20];
-    memcpy(&buffer[0], gid.get(), 12);
-    reinterpret_cast<uint64_t *>(&buffer[12])[0] = timestamp.getValue();
+    memcpy(&buffer[0], gid.get(), GlobalId::LENGTH);
+    uint64_t tmp = timestamp.getValue();
+    memcpy(&buffer[GlobalId::LENGTH], &tmp, sizeof(tmp));
     return XXH64(buffer, sizeof(buffer), 0);
 }
 
diff --git a/searchcore/src/vespa/searchcore/proton/bucketdb/checksumaggregators.h b/searchcore/src/vespa/searchcore/proton/bucketdb/checksumaggregators.h
index 6d6f1b7f842..49762ad107f 100644
--- a/searchcore/src/vespa/searchcore/proton/bucketdb/checksumaggregators.h
+++ b/searchcore/src/vespa/searchcore/proton/bucketdb/checksumaggregators.h
@@ -9,7 +9,7 @@ namespace proton::bucketdb {
  **/
 class LegacyChecksumAggregator : public ChecksumAggregator {
 public:
-    LegacyChecksumAggregator(BucketChecksum seed) : _checksum(seed) { }
+    explicit LegacyChecksumAggregator(BucketChecksum seed) : _checksum(seed) { }
     LegacyChecksumAggregator * clone() const override;
     LegacyChecksumAggregator & addDoc(const GlobalId &gid, const Timestamp &timestamp) override;
     LegacyChecksumAggregator & removeDoc(const GlobalId &gid, const Timestamp &timestamp) override;
@@ -26,7 +26,7 @@ private:
  **/
 class XXH64ChecksumAggregator : public ChecksumAggregator {
 public:
-    XXH64ChecksumAggregator(BucketChecksum seed) : _checksum(seed) { }
+    explicit XXH64ChecksumAggregator(BucketChecksum seed) : _checksum(seed) { }
     XXH64ChecksumAggregator * clone() const override;
     XXH64ChecksumAggregator & addDoc(const GlobalId &gid, const Timestamp &timestamp) override;
     XXH64ChecksumAggregator & removeDoc(const GlobalId &gid, const Timestamp &timestamp) override;