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
30namespace boost
31{
32
33// Debug hooks
34
35#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
36
37void sp_scalar_constructor_hook(void * p);
38void 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
47template<class T> class scoped_ptr // noncopyable
48{
49private:
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
61public:
62
63 typedef T element_type;
64
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
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
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
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
97 T & operator*() const // never throws
98 {
99 BOOST_ASSERT( px != 0 );
100 return *px;
101 }
102
103 T * operator->() const // never throws
104 {
105 BOOST_ASSERT( px != 0 );
106 return px;
107 }
108
109 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
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
127template<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
132template<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
137template<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
142template<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
149template<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
156template<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

source code of boost/boost/smart_ptr/scoped_ptr.hpp