QWeakPointer: add lock() for std::weak_ptr compatibility

[ChangeLog][QtCore][QWeakPointer] Added lock() method for std::weak_ptr compatibility.

Change-Id: I0851d91c51f5a4f04a855a1d8082234ce38396b4
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

3 files changed, 12 insertions, 0 deletions

diff --git a/src/corelib/tools/qsharedpointer.cpp b/src/corelib/tools/qsharedpointer.cpp
index a610fc46e5..19c88fcf1c 100644
--- a/src/corelib/tools/qsharedpointer.cpp
+++ b/src/corelib/tools/qsharedpointer.cpp
@@ -894,6 +894,15 @@
 */
 
 /*!
+    \fn QSharedPointer<T> QWeakPointer::lock() const
+    \since 5.4
+
+    Same as toStrongRef().
+
+    This function is provided for API compatibility with std::weak_ptr.
+*/
+
+/*!
     \fn void QWeakPointer::clear()
 
     Clears this QWeakPointer object, dropping the reference that it
diff --git a/src/corelib/tools/qsharedpointer.h b/src/corelib/tools/qsharedpointer.h
index 34b4bfbb12..ea9b4fbf27 100644
--- a/src/corelib/tools/qsharedpointer.h
+++ b/src/corelib/tools/qsharedpointer.h
@@ -126,6 +126,7 @@ public:
     void clear();
 
     QSharedPointer<T> toStrongRef() const;
+    QSharedPointer<T> lock() const;
 };
 
 template<class T, class X> bool operator==(const QSharedPointer<T> &ptr1, const QSharedPointer<X> &ptr2);
diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index c077b84492..e59efce7ae 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -639,6 +639,8 @@ public:
     inline void clear() { *this = QWeakPointer(); }
 
     inline QSharedPointer<T> toStrongRef() const { return QSharedPointer<T>(*this); }
+    // std::weak_ptr compatibility:
+    inline QSharedPointer<T> lock() const { return toStrongRef(); }
 
 #if defined(QWEAKPOINTER_ENABLE_ARROW)
     inline T *operator->() const { return data(); }