QJsonValue: add rvalue overloads for QJsonArray and QJsonObject ctors

These can be noexcept. Requires to add rvalue overloads for
QCborMap::fromJsonObject() and QCborArray::fromJsonArray(), too.

[ChangeLog][QtCore][QJsonValue] Added constructors taking
rvalue QJsonArray and rvalue QJsonObject.

[ChangeLog][QtCore][QCborMap] Added rvalue overload of
fromJsonObject().

[ChangeLog][QtCore][QCborArray] Added rvalue overload of
fromJsonArray().

Change-Id: I523c9a41166ea932fba4dd204072bd39d2192d2e
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/serialization/qcborarray.h

@@ -267,6 +267,7 @@ public:
     static QCborArray fromStringList(const QStringList &list);
     static QCborArray fromVariantList(const QVariantList &list);
     static QCborArray fromJsonArray(const QJsonArray &array);
+    static QCborArray fromJsonArray(QJsonArray &&array) noexcept;
     QVariantList toVariantList() const;
     QJsonArray toJsonArray() const;
 

src/corelib/serialization/qcbormap.h

@@ -318,6 +318,7 @@ public:
     static QCborMap fromVariantMap(const QVariantMap &map);
     static QCborMap fromVariantHash(const QVariantHash &hash);
     static QCborMap fromJsonObject(const QJsonObject &o);
+    static QCborMap fromJsonObject(QJsonObject &&o) noexcept;
     QVariantMap toVariantMap() const;
     QVariantHash toVariantHash() const;
     QJsonObject toJsonObject() const;

src/corelib/serialization/qjsoncbor.cpp

@@ -875,6 +875,18 @@ QCborArray QCborArray::fromJsonArray(const QJsonArray &array)
     return result;
 }
 
+/*!
+    \overload
+    \since 6.3
+ */
+QCborArray QCborArray::fromJsonArray(QJsonArray &&array) noexcept
+{
+    QCborArray result;
+    result.d = std::exchange(array.a, {});
+    return result;
+
+}
+
 /*!
     Converts the CBOR values to QVariant using QCborValue::toVariant() and
     "stringifies" all the CBOR keys in this map, returning the QVariantMap that
@@ -989,4 +1001,15 @@ QCborMap QCborMap::fromJsonObject(const QJsonObject &obj)
     return result;
 }
 
+/*!
+    \overload
+    \since 6.3
+ */
+QCborMap QCborMap::fromJsonObject(QJsonObject &&obj) noexcept
+{
+    QCborMap result;
+    result.d = std::exchange(obj.o, {});
+    return result;
+}
+
 QT_END_NAMESPACE

src/corelib/serialization/qjsonvalue.cpp

@@ -222,6 +222,15 @@ QJsonValue::QJsonValue(const QJsonArray &a)
 {
 }
 
+/*!
+    \overload
+    \since 6.3
+ */
+QJsonValue::QJsonValue(QJsonArray &&a) noexcept
+    : value(QCborArray::fromJsonArray(std::move(a)))
+{
+}
+
 /*!
     Creates a value of type Object, with value \a o.
  */
@@ -230,6 +239,15 @@ QJsonValue::QJsonValue(const QJsonObject &o)
 {
 }
 
+/*!
+    \overload
+    \since 6.3
+ */
+QJsonValue::QJsonValue(QJsonObject &&o) noexcept
+    : value(QCborMap::fromJsonObject(std::move(o)))
+{
+}
+
 
 /*!
     Destroys the value.

src/corelib/serialization/qjsonvalue.h

@@ -81,7 +81,9 @@ public:
         : QJsonValue(QString::fromUtf8(s)) {}
 #endif
     QJsonValue(const QJsonArray &a);
+    QJsonValue(QJsonArray &&a) noexcept;
     QJsonValue(const QJsonObject &o);
+    QJsonValue(QJsonObject &&o) noexcept;
 
     ~QJsonValue();