QCborValue: implement move semantics for QCbor{Array,Map} constructors

Happens a lot because of the implicit conversions. So I made it inline.

Change-Id: Icc2c231dc2c44abdb087fffd1533f311b95460b8
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/serialization/qcborarray.h

@@ -264,6 +264,11 @@ private:
 
 Q_DECLARE_SHARED(QCborArray)
 
+inline QCborValue::QCborValue(QCborArray &&a)
+    : n(-1), container(a.d.take()), t(Array)
+{
+}
+
 inline QCborArray QCborValueRef::toArray() const
 {
     return concrete().toArray();

src/corelib/serialization/qcbormap.h

@@ -322,6 +322,11 @@ private:
 
 Q_DECLARE_SHARED(QCborMap)
 
+inline QCborValue::QCborValue(QCborMap &&m)
+    : n(-1), container(m.d.take()), t(Map)
+{
+}
+
 inline QCborMap QCborValueRef::toMap() const
 {
     return concrete().toMap();

src/corelib/serialization/qcborvalue.h

@@ -139,7 +139,9 @@ public:
     QT_ASCII_CAST_WARN QCborValue(const char *s) : QCborValue(QString::fromUtf8(s)) {}
 #endif
     QCborValue(const QCborArray &a);
+    QCborValue(QCborArray &&a);
     QCborValue(const QCborMap &m);
+    QCborValue(QCborMap &&m);
     QCborValue(QCborTag tag, const QCborValue &taggedValue = QCborValue());
     QCborValue(QCborKnownTags t_, const QCborValue &tv = QCborValue())
         : QCborValue(QCborTag(t_), tv)

src/corelib/tools/qshareddata.h

@@ -159,6 +159,7 @@ public:
     inline T *operator->() const { return d; }
     inline T *data() const { return d; }
     inline const T *constData() const { return d; }
+    inline T *take() { T *x = d; d = nullptr; return x; }
 
     inline void detach() { if (d && d->ref.load() != 1) detach_helper(); }