From 9129d2714a5e9b1ca86cf7911edee90ee13493d8 Mon Sep 17 00:00:00 2001
From: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Date: Wed, 2 Sep 2015 16:22:41 +0200
Subject: Implement QDebug support for QSharedPointer

... otherwise the type goes through operator bool() and prints
"true" or "false" (!).

[ChangeLog][QtCore][QSharedPointer] Added support for debug
printing via QDebug.

Change-Id: Ic3ef9b9feee8d6ca08f1dd69f20f421fea20ca00
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
---
 src/corelib/tools/qsharedpointer.cpp    | 11 +++++++++++
 src/corelib/tools/qsharedpointer.h      |  2 ++
 src/corelib/tools/qsharedpointer_impl.h | 11 +++++++++++
 3 files changed, 24 insertions(+)

diff --git a/src/corelib/tools/qsharedpointer.cpp b/src/corelib/tools/qsharedpointer.cpp
index 86f4c6a268..4d30396cb6 100644
--- a/src/corelib/tools/qsharedpointer.cpp
+++ b/src/corelib/tools/qsharedpointer.cpp
@@ -1292,6 +1292,17 @@
     compile. Use qSharedPointerConstCast to cast away the constness.
 */
 
+/*!
+    \fn QDebug operator<<(QDebug debug, const QSharedPointer<T> &ptr)
+    \relates QSharedPointer
+    \since 5.7
+
+    Writes the pointer tracked by \a ptr into the debug object \a debug for
+    debugging purposes.
+
+    \sa {Debugging Techniques}
+*/
+
 #include <qset.h>
 #include <qmutex.h>
 
diff --git a/src/corelib/tools/qsharedpointer.h b/src/corelib/tools/qsharedpointer.h
index 279ec36a28..56e13d500f 100644
--- a/src/corelib/tools/qsharedpointer.h
+++ b/src/corelib/tools/qsharedpointer.h
@@ -153,6 +153,8 @@ template <class X, class T> QSharedPointer<X> qSharedPointerObjectCast(const QWe
 
 template <class X, class T> QWeakPointer<X> qWeakPointerCast(const QWeakPointer<T> &src);
 
+template <class T> QDebug operator<<(QDebug debug, const QSharedPointer<T> &ptr);
+
 QT_END_NAMESPACE
 
 #endif // Q_QDOC
diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index 1323dd6b1c..e224b26d9f 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -55,6 +55,7 @@ QT_END_NAMESPACE
 #include <new>
 #include <QtCore/qatomic.h>
 #include <QtCore/qobject.h>    // for qobject_cast
+#include <QtCore/qdebug.h>
 #if QT_DEPRECATED_SINCE(5, 5)
 #include <QtCore/qhash.h>
 #endif
@@ -858,6 +859,16 @@ inline void qSwap(QSharedPointer<T> &p1, QSharedPointer<T> &p2)
     p1.swap(p2);
 }
 
+#ifndef QT_NO_DEBUG_STREAM
+template <class T>
+Q_INLINE_TEMPLATE QDebug operator<<(QDebug debug, const QSharedPointer<T> &ptr)
+{
+    QDebugStateSaver saver(debug);
+    debug.nospace() << "QSharedPointer(" << ptr.data() << ")";
+    return debug;
+}
+#endif
+
 QT_END_NAMESPACE
 namespace std {
     template <class T>
-- 
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