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1 | //----------------------------------------------------------------------------- |
2 | // boost variant/detail/backup_holder.hpp header file | |
3 | // See http://www.boost.org for updates, documentation, and revision history. | |
4 | //----------------------------------------------------------------------------- | |
5 | // | |
6 | // Copyright (c) 2003 | |
7 | // Eric Friedman | |
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 | #ifndef BOOST_VARIANT_DETAIL_BACKUP_HOLDER_HPP | |
14 | #define BOOST_VARIANT_DETAIL_BACKUP_HOLDER_HPP | |
15 | ||
16 | #include <boost/config.hpp> | |
17 | #include <boost/assert.hpp> | |
18 | ||
19 | namespace boost { | |
20 | namespace detail { namespace variant { | |
21 | ||
22 | template <typename T> | |
23 | class backup_holder | |
24 | { | |
25 | private: // representation | |
26 | ||
27 | T* backup_; | |
28 | ||
29 | public: // structors | |
30 | ||
31 | ~backup_holder() BOOST_NOEXCEPT | |
32 | { | |
33 | delete backup_; | |
34 | } | |
35 | ||
36 | explicit backup_holder(T* backup) BOOST_NOEXCEPT | |
37 | : backup_(backup) | |
38 | { | |
39 | } | |
40 | ||
41 | backup_holder(const backup_holder&); | |
42 | ||
43 | public: // modifiers | |
44 | ||
45 | backup_holder& operator=(const backup_holder& rhs) | |
46 | { | |
47 | *backup_ = rhs.get(); | |
48 | return *this; | |
49 | } | |
50 | ||
51 | backup_holder& operator=(const T& rhs) | |
52 | { | |
53 | *backup_ = rhs; | |
54 | return *this; | |
55 | } | |
56 | ||
57 | void swap(backup_holder& rhs) BOOST_NOEXCEPT | |
58 | { | |
59 | T* tmp = rhs.backup_; | |
60 | rhs.backup_ = this->backup_; | |
61 | this->backup_ = tmp; | |
62 | } | |
63 | ||
64 | public: // queries | |
65 | ||
66 | T& get() BOOST_NOEXCEPT | |
67 | { | |
68 | return *backup_; | |
69 | } | |
70 | ||
71 | const T& get() const BOOST_NOEXCEPT | |
72 | { | |
73 | return *backup_; | |
74 | } | |
75 | ||
76 | }; | |
77 | ||
78 | template <typename T> | |
79 | backup_holder<T>::backup_holder(const backup_holder&) | |
80 | : backup_(0) | |
81 | { | |
82 | // not intended for copy, but do not want to prohibit syntactically | |
83 | BOOST_ASSERT(false); | |
84 | } | |
85 | ||
86 | template <typename T> | |
87 | void swap(backup_holder<T>& lhs, backup_holder<T>& rhs) BOOST_NOEXCEPT | |
88 | { | |
89 | lhs.swap(rhs); | |
90 | } | |
91 | ||
92 | }} // namespace detail::variant | |
93 | } // namespace boost | |
94 | ||
95 | #endif // BOOST_VARIANT_DETAIL_BACKUP_HOLDER_HPP |