QGrpcCallOptions: add swap() and lift move SMFs to be inline

Add a custom deleter to the std::unique_ptr so that we can
lift the SMF to be inline.

As a drive-by add the missing documentation.

Task-number: QTBUG-123625
Pick-to: 6.8
Change-Id: I11509ae925a6964f4d7e9ddd30a30c604edcb909
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>

src/grpc/qgrpccalloptions.cpp

@@ -27,10 +27,15 @@ public:
     QGrpcMetadata metadata;
 };
 
+static void dPtrDeleter(QGrpcCallOptionsPrivate *ptr)
+{
+    delete ptr;
+}
+
 /*!
     Constructs an empty QGrpcCallOptions object.
 */
-QGrpcCallOptions::QGrpcCallOptions() : dPtr(std::make_unique<QGrpcCallOptionsPrivate>())
+QGrpcCallOptions::QGrpcCallOptions() : dPtr(new QGrpcCallOptionsPrivate(), dPtrDeleter)
 {
 }
 
@@ -43,7 +48,7 @@ QGrpcCallOptions::~QGrpcCallOptions() = default;
     Construct a copy of QGrpcCallOptions with \a other object.
 */
 QGrpcCallOptions::QGrpcCallOptions(const QGrpcCallOptions &other)
-    : dPtr(std::make_unique<QGrpcCallOptionsPrivate>(*other.dPtr))
+    : dPtr(new QGrpcCallOptionsPrivate(*other.dPtr), dPtrDeleter)
 {
 }
 
@@ -58,9 +63,30 @@ QGrpcCallOptions &QGrpcCallOptions::operator=(const QGrpcCallOptions &other)
     return *this;
 }
 
-QGrpcCallOptions::QGrpcCallOptions(QGrpcCallOptions &&other) noexcept = default;
+/*!
+    \fn QGrpcCallOptions::QGrpcCallOptions(QGrpcCallOptions &&other) noexcept
+    Move-constructs a new QGrpcCallOptions from \a other.
 
-QGrpcCallOptions &QGrpcCallOptions::operator=(QGrpcCallOptions &&other) noexcept = default;
+    \note The moved-from object \a other is placed in a partially-formed state,
+    in which the only valid operations are destruction and assignment of a new
+    value.
+*/
+
+/*!
+    \fn QGrpcCallOptions &QGrpcCallOptions::operator=(QGrpcCallOptions &&other) noexcept
+    Move-assigns \a other to this QGrpcCallOptions instance and returns a
+    reference to it.
+
+    \note The moved-from object \a other is placed in a partially-formed state,
+    in which the only valid operations are destruction and assignment of a new
+    value.
+*/
+
+/*!
+    \since 6.8
+    \fn void QGrpcCallOptions::swap(QGrpcCallOptions &other) noexcept
+    Swaps this instance with \a other. This operation is very fast and never fails.
+*/
 
 /*!
     Sets deadline value with \a deadline and returns updated QGrpcCallOptions object.

src/grpc/qgrpccalloptions.h

@@ -7,6 +7,8 @@
 #include <QtGrpc/qgrpcdefs.h>
 #include <QtGrpc/qtgrpcglobal.h>
 
+#include <QtCore/qtclasshelpermacros.h>
+
 #include <memory>
 #include <optional>
 
@@ -23,8 +25,11 @@ public:
 
     Q_GRPC_EXPORT QGrpcCallOptions(const QGrpcCallOptions &other);
     Q_GRPC_EXPORT QGrpcCallOptions &operator=(const QGrpcCallOptions &other);
-    Q_GRPC_EXPORT QGrpcCallOptions(QGrpcCallOptions &&other) noexcept;
-    Q_GRPC_EXPORT QGrpcCallOptions &operator=(QGrpcCallOptions &&other) noexcept;
+
+    QGrpcCallOptions(QGrpcCallOptions &&other) noexcept = default;
+    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QGrpcCallOptions)
+
+    void swap(QGrpcCallOptions &other) noexcept { dPtr.swap(other.dPtr); }
 
     Q_GRPC_EXPORT QGrpcCallOptions &setDeadline(QGrpcDuration deadline);
     Q_GRPC_EXPORT QGrpcCallOptions &setMetadata(const QGrpcMetadata &metadata);
@@ -35,7 +40,7 @@ public:
     [[nodiscard]] Q_GRPC_EXPORT QGrpcMetadata metadata() && noexcept;
 
 private:
-    std::unique_ptr<QGrpcCallOptionsPrivate> dPtr;
+    std::unique_ptr<QGrpcCallOptionsPrivate, void (*)(QGrpcCallOptionsPrivate *)> dPtr;
 
 #ifndef QT_NO_DEBUG_STREAM
     friend Q_GRPC_EXPORT QDebug operator<<(QDebug debug, const QGrpcCallOptions &callOpts);