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21
22
23 #if ! defined(INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX)
24 #define INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX
25
26 #include "boost/shared_ptr.hpp"
27 #include <functional>
28
29 namespace comphelper {
30
31 /// @internal
32 namespace detail {
33 /// @internal
34 template <typename T> struct ReleaseFunc : ::std::unary_function<T *, void> {
operator ()comphelper::detail::ReleaseFunc35 void operator()( T * p ) const { p->release(); }
36 };
37 } // namespace detail
38
39 /** Makes a boost::shared_ptr from a ref-counted UNO object pointer.
40 This makes sense if the object is used via UNO (implementing some X
41 interface) and also internally using its implementation class, e.g.
42
43 <pre>
44 boost::shared_ptr<MyUnoImpl> const ptr(
45 comphelper::make_shared_from_UNO( new MyUnoImpl ) );
46 ...
47 xUno->callingUno( uno::Reference<XSomeInterface>( ptr.get() ) );
48 ...
49 takeSharedPtr( ptr );
50 ...
51 </pre>
52
53 @attention The shared_ptr operates on a separate reference counter, so
54 weak pointers (boost::weak_ptr) are invalidated when the last
55 shared_ptr is destroyed, although the UNO object may still be
56 alive.
57
58 @param p object pointer
59 @return shared_ptr to object
60 */
61 template <typename T>
make_shared_from_UNO(T * p)62 inline ::boost::shared_ptr<T> make_shared_from_UNO( T * p )
63 {
64 p->acquire();
65 return ::boost::shared_ptr<T>( p, detail::ReleaseFunc<T>() );
66 }
67
68 } // namespace comphelper
69
70 #endif // ! defined(INCLUDED_COMPHELPER_MAKE_SHARED_FROM_UNO_HXX)
71
72