Make Qt exception safer.

Squashed commit of the branch haralds-haralds-qt-s60-topics/topic/exceptions,
which also contains the full history.

Rev-By: Harald Fernengel
Rev-By: Ralf Engels

1 files changed, 64 insertions, 0 deletions

diff --git a/doc/src/snippets/code/src_corelib_tools_qscopedpointer.cpp b/doc/src/snippets/code/src_corelib_tools_qscopedpointer.cpp
new file mode 100644
index 0000000..05377dd
--- /dev/null
+++ b/doc/src/snippets/code/src_corelib_tools_qscopedpointer.cpp
@@ -0,0 +1,64 @@
+//! [0]
+void myFunction(bool useSubClass)
+{
+    MyClass *p = useSubClass ? new MyClass() : new MySubClass;
+    QIODevice *device = handsOverOwnership();
+    QIODevi
+
+    if (m_value > 3) {
+        delete p;
+        delete device;
+        return;
+    }
+
+    try {
+        process(device);
+    }
+    catch (...) {
+        delete p;
+        delete device;
+        throw;
+    }
+
+    delete p;
+    delete device;
+}
+//! [0]
+
+//! [1]
+void myFunction(bool useSubClass)
+{
+    QScopedPointer<MyClass> p(useSubClass ? new MyClass() : new MySubClass);
+    QScopedPointer<QIODevice> device(handsOverOwnership());
+
+    if (m_value > 3)
+        return;
+
+    process(device);
+}
+//! [1]
+
+//! [2]
+    const QWidget *const p = new QWidget();
+    // is equivalent to:
+    const QScopedPointer<const QWidget> p(new QWidget());
+
+    QWidget *const p = new QWidget();
+    // is equivalent to:
+    const QScopedPointer<QWidget> p(new QWidget());
+
+    QWidget *const p = new QWidget();
+    // is equivalent to:
+    const QScopedPointer<QWidget> p(new QWidget());
+
+    const QWidget *p = new QWidget();
+    // is equivalent to:
+    QScopedPointer<const QWidget> p(new QWidget());
+
+//! [2]
+
+//! [3]
+if (scopedPointer) {
+    ...
+}
+//! [3]