QStringList: add op= overloads for QList<QString>

QStringList = QList<QString> already compiled, but was interpreted as
QStringList = QStringList(QList<QString>), which involves the QList
copy ctor. Adding the overload saves that copy.

Cannot use a using declaration here, since the return type is different.

Change-Id: I9f4feb2f97480d2d6a3b6fa7c71b5d511b623601
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/src/corelib/tools/qstringlist.cpp b/src/corelib/tools/qstringlist.cpp
index a9d704ca4c..c735fbcc42 100644
--- a/src/corelib/tools/qstringlist.cpp
+++ b/src/corelib/tools/qstringlist.cpp
@@ -204,6 +204,27 @@ QT_BEGIN_NAMESPACE
 */
 
 /*!
+    \fn QStringList &QStringList::operator=(const QList<QString> &other)
+    \since 5.4
+
+    Copy assignment operator from QList<QString>. Assigns the \a other
+    list of strings to this string list.
+
+    After the operation, \a other and \c *this will be equal.
+*/
+
+/*!
+    \fn QStringList &QStringList::operator=(QList<QString> &&other)
+    \overload
+    \since 5.4
+
+    Move assignment operator from QList<QString>. Moves the \a other
+    list of strings to this string list.
+
+    After the operation, \a other will be empty.
+*/
+
+/*!
     \fn void QStringList::sort(Qt::CaseSensitivity cs)
 
     Sorts the list of strings in ascending order.
diff --git a/src/corelib/tools/qstringlist.h b/src/corelib/tools/qstringlist.h
index 1cdafb4ec2..271599b9d7 100644
--- a/src/corelib/tools/qstringlist.h
+++ b/src/corelib/tools/qstringlist.h
@@ -68,6 +68,13 @@ public:
     inline QStringList(std::initializer_list<QString> args) : QList<QString>(args) { }
 #endif
 
+    QStringList &operator=(const QList<QString> &other)
+    { QList<QString>::operator=(other); return *this; }
+#ifdef Q_COMPILER_RVALUE_REFS
+    QStringList &operator=(QList<QString> &&other)
+    { QList<QString>::operator=(std::move(other)); return *this; }
+#endif
+
     inline void sort(Qt::CaseSensitivity cs = Qt::CaseSensitive);
     inline int removeDuplicates();