1 #ifndef BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED

     2 #define BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED

     3 

     4 //

     5 //  enable_shared_from_this.hpp

     6 //

     7 //  Copyright (c) 2002 Peter Dimov

     8 //

     9 // Distributed under the Boost Software License, Version 1.0. (See

    10 // accompanying file LICENSE_1_0.txt or copy at

    11 // http://www.boost.org/LICENSE_1_0.txt)

    12 //

    13 //  http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html

    14 //

    15 

    16 #include <boost/weak_ptr.hpp>

    17 #include <boost/shared_ptr.hpp>

    18 #include <boost/assert.hpp>

    19 #include <boost/config.hpp>

    20 

    21 namespace boost

    22 {

    23 

    24 template<class T> class enable_shared_from_this

    25 {

    26 protected:

    27 

    28     enable_shared_from_this()

    29     {

    30     }

    31 

    32     enable_shared_from_this(enable_shared_from_this const &)

    33     {

    34     }

    35 

    36     enable_shared_from_this & operator=(enable_shared_from_this const &)

    37     {

    38         return *this;

    39     }

    40 

    41     ~enable_shared_from_this()

    42     {

    43     }

    44 

    45 public:

    46 

    47     shared_ptr<T> shared_from_this()

    48     {

    49         shared_ptr<T> p(_internal_weak_this);

    50         BOOST_ASSERT(p.get() == this);

    51         return p;

    52     }

    53 

    54     shared_ptr<T const> shared_from_this() const

    55     {

    56         shared_ptr<T const> p(_internal_weak_this);

    57         BOOST_ASSERT(p.get() == this);

    58         return p;

    59     }

    60 

    61 //  Note: No, you don't need to initialize _internal_weak_this

    62 //

    63 //  Please read the documentation, not the code

    64 //

    65 //  http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html

    66 

    67     typedef T _internal_element_type; // for bcc 5.5.1

    68     mutable weak_ptr<_internal_element_type> _internal_weak_this;

    69 };

    70 

    71 } // namespace boost

    72 

    73 #endif  // #ifndef BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED