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       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : #ifndef INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX
      20             : #define INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX
      21             : 
      22             : #include <boost/shared_ptr.hpp>
      23             : #include <functional>
      24             : 
      25             : namespace comphelper {
      26             : 
      27             : /// @internal
      28             : namespace detail {
      29             : /// @internal
      30             : template <typename T> struct ReleaseFunc : ::std::unary_function<T *, void> {
      31           0 :     void operator()( T * p ) const { p->release(); }
      32             : };
      33             : } // namespace detail
      34             : 
      35             : /** Makes a boost::shared_ptr from a ref-counted UNO object pointer.
      36             :     This makes sense if the object is used via UNO (implementing some X
      37             :     interface) and also internally using its implementation class, e.g.
      38             : 
      39             :     <pre>
      40             :         boost::shared_ptr<MyUnoImpl> const ptr(
      41             :             comphelper::make_shared_from_UNO( new MyUnoImpl ) );
      42             :         ...
      43             :         xUno->callingUno( uno::Reference<XSomeInterface>( ptr.get() ) );
      44             :         ...
      45             :         takeSharedPtr( ptr );
      46             :         ...
      47             :     </pre>
      48             : 
      49             :     @attention The shared_ptr operates on a separate reference counter, so
      50             :                weak pointers (boost::weak_ptr) are invalidated when the last
      51             :                shared_ptr is destroyed, although the UNO object may still be
      52             :                alive.
      53             : 
      54             :     @param p object pointer
      55             :     @return shared_ptr to object
      56             : */
      57             : template <typename T>
      58           0 : inline ::boost::shared_ptr<T> make_shared_from_UNO( T * p )
      59             : {
      60           0 :     p->acquire();
      61           0 :     return ::boost::shared_ptr<T>( p, detail::ReleaseFunc<T>() );
      62             : }
      63             : 
      64             : } // namespace comphelper
      65             : 
      66             : #endif // ! defined(INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX)
      67             : 
      68             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */