Make Digest32 implicitly shared class

src/base/bittorrent/infohash.h

@@ -85,3 +85,6 @@ namespace BitTorrent
 }
 
 Q_DECLARE_METATYPE(BitTorrent::TorrentID)
+// We can declare it as Q_MOVABLE_TYPE to improve performance
+// since base type uses QSharedDataPointer as the only member
+Q_DECLARE_TYPEINFO(BitTorrent::TorrentID, Q_MOVABLE_TYPE);

src/base/digest32.h

@@ -32,6 +32,8 @@
 
 #include <QByteArray>
 #include <QHash>
+#include <QSharedData>
+#include <QSharedDataPointer>
 #include <QString>
 
 template <int N>
@@ -43,11 +45,11 @@ public:
     Digest32() = default;
 
     Digest32(const UnderlyingType &nativeDigest)
-        : m_valid {true}
-        , m_nativeDigest {nativeDigest}
     {
+        m_dataPtr->valid = true;
+        m_dataPtr->nativeDigest = nativeDigest;
         const QByteArray raw = QByteArray::fromRawData(nativeDigest.data(), length());
-        m_hashString = QString::fromLatin1(raw.toHex());
+        m_dataPtr->hashString = QString::fromLatin1(raw.toHex());
     }
 
     static constexpr int length()
@@ -57,12 +59,12 @@ public:
 
     bool isValid() const
     {
-        return m_valid;
+        return m_dataPtr->valid;
     }
 
     operator UnderlyingType() const
     {
-        return m_nativeDigest;
+        return m_dataPtr->nativeDigest;
     }
 
     static Digest32 fromString(const QString &digestString)
@@ -75,22 +77,27 @@ public:
             return {};
 
         Digest32 result;
-        result.m_valid = true;
-        result.m_hashString = digestString;
-        result.m_nativeDigest.assign(raw.constData());
+        result.m_dataPtr->valid = true;
+        result.m_dataPtr->hashString = digestString;
+        result.m_dataPtr->nativeDigest.assign(raw.constData());
 
         return result;
     }
 
     QString toString() const
     {
-        return m_hashString;
+        return m_dataPtr->hashString;
     }
 
 private:
-    bool m_valid = false;
-    UnderlyingType m_nativeDigest;
-    QString m_hashString;
+    struct Data : public QSharedData
+    {
+        bool valid = false;
+        UnderlyingType nativeDigest;
+        QString hashString;
+    };
+
+    QSharedDataPointer<Data> m_dataPtr {new Data};
 };
 
 template <int N>