1 #ifndef BOOST_SCOPED_PTR_HPP_INCLUDED

     2 #define BOOST_SCOPED_PTR_HPP_INCLUDED

     3 

     4 //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.

     5 //  Copyright (c) 2001, 2002 Peter Dimov

     6 //

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

     8 //  accompanying file LICENSE_1_0.txt or copy at

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

    10 //

    11 //  http://www.boost.org/libs/smart_ptr/scoped_ptr.htm

    12 //

    13 

    14 #include <boost/assert.hpp>

    15 #include <boost/checked_delete.hpp>

    16 #include <boost/detail/workaround.hpp>

    17 

    18 #ifndef BOOST_NO_AUTO_PTR

    19 # include <memory>          // for std::auto_ptr

    20 #endif

    21 

    22 namespace boost

    23 {

    24 

    25 // Debug hooks

    26 

    27 #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)

    28 

    29 void sp_scalar_constructor_hook(void * p);

    30 void sp_scalar_destructor_hook(void * p);

    31 

    32 #endif

    33 

    34 //  scoped_ptr mimics a built-in pointer except that it guarantees deletion

    35 //  of the object pointed to, either on destruction of the scoped_ptr or via

    36 //  an explicit reset(). scoped_ptr is a simple solution for simple needs;

    37 //  use shared_ptr or std::auto_ptr if your needs are more complex.

    38 

    39 template<class T> class scoped_ptr // noncopyable

    40 {

    41 private:

    42 

    43     T * ptr;

    44 

    45     scoped_ptr(scoped_ptr const &);

    46     scoped_ptr & operator=(scoped_ptr const &);

    47 

    48     typedef scoped_ptr<T> this_type;

    49 

    50 public:

    51 

    52     typedef T element_type;

    53 

    54     explicit scoped_ptr(T * p = 0): ptr(p) // never throws

    55     {

    56 #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)

    57         boost::sp_scalar_constructor_hook(ptr);

    58 #endif

    59     }

    60 

    61 #ifndef BOOST_NO_AUTO_PTR

    62 

    63     explicit scoped_ptr(std::auto_ptr<T> p): ptr(p.release()) // never throws

    64     {

    65 #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)

    66         boost::sp_scalar_constructor_hook(ptr);

    67 #endif

    68     }

    69 

    70 #endif

    71 

    72     ~scoped_ptr() // never throws

    73     {

    74 #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)

    75         boost::sp_scalar_destructor_hook(ptr);

    76 #endif

    77         boost::checked_delete(ptr);

    78     }

    79 

    80     void reset(T * p = 0) // never throws

    81     {

    82         BOOST_ASSERT(p == 0 || p != ptr); // catch self-reset errors

    83         this_type(p).swap(*this);

    84     }

    85 

    86     T & operator*() const // never throws

    87     {

    88         BOOST_ASSERT(ptr != 0);

    89         return *ptr;

    90     }

    91 

    92     T * operator->() const // never throws

    93     {

    94         BOOST_ASSERT(ptr != 0);

    95         return ptr;

    96     }

    97 

    98     T * get() const // never throws

    99     {

   100         return ptr;

   101     }

   102 

   103     // implicit conversion to "bool"

   104 

   105 #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)

   106 

   107     operator bool () const

   108     {

   109         return ptr != 0;

   110     }

   111 

   112 #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))

   113     typedef T * (this_type::*unspecified_bool_type)() const;

   114     

   115     operator unspecified_bool_type() const // never throws

   116     {

   117         return ptr == 0? 0: &this_type::get;

   118     }

   119 

   120 #else 

   121     typedef T * this_type::*unspecified_bool_type;

   122 

   123     operator unspecified_bool_type() const // never throws

   124     {

   125         return ptr == 0? 0: &this_type::ptr;

   126     }

   127 

   128 #endif

   129 

   130     bool operator! () const // never throws

   131     {

   132         return ptr == 0;

   133     }

   134 

   135     void swap(scoped_ptr & b) // never throws

   136     {

   137         T * tmp = b.ptr;

   138         b.ptr = ptr;

   139         ptr = tmp;

   140     }

   141 };

   142 

   143 template<class T> inline void swap(scoped_ptr<T> & a, scoped_ptr<T> & b) // never throws

   144 {

   145     a.swap(b);

   146 }

   147 

   148 // get_pointer(p) is a generic way to say p.get()

   149 

   150 template<class T> inline T * get_pointer(scoped_ptr<T> const & p)

   151 {

   152     return p.get();

   153 }

   154 

   155 } // namespace boost

   156 

   157 #endif // #ifndef BOOST_SCOPED_PTR_HPP_INCLUDED