1 #ifndef BOOST_SMART_PTR_SCOPED_PTR_HPP_INCLUDED
2 #define BOOST_SMART_PTR_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/config.hpp>
15 #include <boost/assert.hpp>
16 #include <boost/checked_delete.hpp>
17 #include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
18 #include <boost/smart_ptr/detail/sp_disable_deprecated.hpp>
19 #include <boost/detail/workaround.hpp>
20
21 #ifndef BOOST_NO_AUTO_PTR
22 # include <memory> // for std::auto_ptr
23 #endif
24
25 #if defined( BOOST_SP_DISABLE_DEPRECATED )
26 #pragma GCC diagnostic push
27 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
28 #endif
29
30 namespace boost
31 {
32
33 // Debug hooks
34
35 #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
36
37 void sp_scalar_constructor_hook(void * p);
38 void sp_scalar_destructor_hook(void * p);
39
40 #endif
41
42 // scoped_ptr mimics a built-in pointer except that it guarantees deletion
43 // of the object pointed to, either on destruction of the scoped_ptr or via
44 // an explicit reset(). scoped_ptr is a simple solution for simple needs;
45 // use shared_ptr or std::auto_ptr if your needs are more complex.
46
47 template<class T> class scoped_ptr // noncopyable
48 {
49 private:
50
51 T * px;
52
53 scoped_ptr(scoped_ptr const &);
54 scoped_ptr & operator=(scoped_ptr const &);
55
56 typedef scoped_ptr<T> this_type;
57
58 void operator==( scoped_ptr const& ) const;
59 void operator!=( scoped_ptr const& ) const;
60
61 public:
62
63 typedef T element_type;
64
scoped_ptr(T * p=0)65 explicit scoped_ptr( T * p = 0 ): px( p ) // never throws
66 {
67 #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
68 boost::sp_scalar_constructor_hook( px );
69 #endif
70 }
71
72 #ifndef BOOST_NO_AUTO_PTR
73
scoped_ptr(std::auto_ptr<T> p)74 explicit scoped_ptr( std::auto_ptr<T> p ) BOOST_NOEXCEPT : px( p.release() )
75 {
76 #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
77 boost::sp_scalar_constructor_hook( px );
78 #endif
79 }
80
81 #endif
82
~scoped_ptr()83 ~scoped_ptr() // never throws
84 {
85 #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
86 boost::sp_scalar_destructor_hook( px );
87 #endif
88 boost::checked_delete( px );
89 }
90
reset(T * p=0)91 void reset(T * p = 0) // never throws
92 {
93 BOOST_ASSERT( p == 0 || p != px ); // catch self-reset errors
94 this_type(p).swap(*this);
95 }
96
operator *() const97 T & operator*() const // never throws
98 {
99 BOOST_ASSERT( px != 0 );
100 return *px;
101 }
102
operator ->() const103 T * operator->() const // never throws
104 {
105 BOOST_ASSERT( px != 0 );
106 return px;
107 }
108
get() const109 T * get() const BOOST_NOEXCEPT
110 {
111 return px;
112 }
113
114 // implicit conversion to "bool"
115 #include <boost/smart_ptr/detail/operator_bool.hpp>
116
swap(scoped_ptr & b)117 void swap(scoped_ptr & b) BOOST_NOEXCEPT
118 {
119 T * tmp = b.px;
120 b.px = px;
121 px = tmp;
122 }
123 };
124
125 #if !defined( BOOST_NO_CXX11_NULLPTR )
126
operator ==(scoped_ptr<T> const & p,boost::detail::sp_nullptr_t)127 template<class T> inline bool operator==( scoped_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
128 {
129 return p.get() == 0;
130 }
131
operator ==(boost::detail::sp_nullptr_t,scoped_ptr<T> const & p)132 template<class T> inline bool operator==( boost::detail::sp_nullptr_t, scoped_ptr<T> const & p ) BOOST_NOEXCEPT
133 {
134 return p.get() == 0;
135 }
136
operator !=(scoped_ptr<T> const & p,boost::detail::sp_nullptr_t)137 template<class T> inline bool operator!=( scoped_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
138 {
139 return p.get() != 0;
140 }
141
operator !=(boost::detail::sp_nullptr_t,scoped_ptr<T> const & p)142 template<class T> inline bool operator!=( boost::detail::sp_nullptr_t, scoped_ptr<T> const & p ) BOOST_NOEXCEPT
143 {
144 return p.get() != 0;
145 }
146
147 #endif
148
swap(scoped_ptr<T> & a,scoped_ptr<T> & b)149 template<class T> inline void swap(scoped_ptr<T> & a, scoped_ptr<T> & b) BOOST_NOEXCEPT
150 {
151 a.swap(b);
152 }
153
154 // get_pointer(p) is a generic way to say p.get()
155
get_pointer(scoped_ptr<T> const & p)156 template<class T> inline T * get_pointer(scoped_ptr<T> const & p) BOOST_NOEXCEPT
157 {
158 return p.get();
159 }
160
161 } // namespace boost
162
163 #if defined( BOOST_SP_DISABLE_DEPRECATED )
164 #pragma GCC diagnostic pop
165 #endif
166
167 #endif // #ifndef BOOST_SMART_PTR_SCOPED_PTR_HPP_INCLUDED
168