Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/include/comphelper/make_shared_from_uno.hxx b/include/comphelper/make_shared_from_uno.hxx
new file mode 100644
index 000000000..7075e3000
--- /dev/null
+++ b/include/comphelper/make_shared_from_uno.hxx
@@ -0,0 +1,68 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX
+#define INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX
+
+#include <memory>
+
+namespace comphelper
+{
+/// @internal
+namespace detail
+{
+/// @internal
+template <typename T> struct ReleaseFunc
+{
+    void operator()(T* p) const { p->release(); }
+};
+} // namespace detail
+
+/** Makes a std::shared_ptr from a ref-counted UNO object pointer.
+    This makes sense if the object is used via UNO (implementing some X
+    interface) and also internally using its implementation class, e.g.
+
+    <pre>
+        std::shared_ptr<MyUnoImpl> const ptr(
+            comphelper::make_shared_from_UNO( new MyUnoImpl ) );
+        ...
+        xUno->callingUno( uno::Reference<XSomeInterface>( ptr.get() ) );
+        ...
+        takeSharedPtr( ptr );
+        ...
+    </pre>
+
+    @attention The shared_ptr operates on a separate reference counter, so
+               weak pointers (std::weak_ptr) are invalidated when the last
+               shared_ptr is destroyed, although the UNO object may still be
+               alive.
+
+    @param p object pointer
+    @return shared_ptr to object
+*/
+template <typename T> inline std::shared_ptr<T> make_shared_from_UNO(T* p)
+{
+    p->acquire();
+    return std::shared_ptr<T>(p, detail::ReleaseFunc<T>());
+}
+
+} // namespace comphelper
+
+#endif // ! defined(INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX)
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */