PMDK C++ bindings  1.2.0
This is the C++ bindings documentation for PMDK's libpmemobj.
life.hpp
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32 
38 #ifndef LIBPMEMOBJ_DESTROYER_HPP
39 #define LIBPMEMOBJ_DESTROYER_HPP
40 
41 #include <stddef.h>
42 #include <utility>
43 
45 
46 namespace pmem
47 {
48 
49 namespace detail
50 {
51 
52 /*
53  * Template for checking if T is not an array.
54  */
55 template <typename T>
56 struct if_not_array {
57  typedef T type;
58 };
59 
60 /*
61  * Template for checking if T is not an array.
62  */
63 template <typename T>
64 struct if_not_array<T[]>;
65 
66 /*
67  * Template for checking if T is not an array.
68  */
69 template <typename T, size_t N>
70 struct if_not_array<T[N]>;
71 
72 /*
73  * Template for checking if T is an array.
74  */
75 template <typename T>
76 struct if_size_array;
77 
78 /*
79  * Template for checking if T is an array.
80  */
81 template <typename T>
82 struct if_size_array<T[]>;
83 
84 /*
85  * Template for checking if T is an array.
86  */
87 template <typename T, size_t N>
88 struct if_size_array<T[N]> {
89  typedef T type[N];
90 };
91 
92 /*
93  * Calls object's constructor.
94  */
95 template <typename T, typename... Args>
96 void
97 create(typename if_not_array<T>::type *ptr, Args &&... args)
98 {
99  new (static_cast<void *>(ptr)) T(std::forward<Args>(args)...);
100 }
101 
102 /*
103  * Recursively calls array's elements' constructors.
104  */
105 template <typename T, typename... Args>
106 void
107 create(typename if_size_array<T>::type *ptr, Args &&... args)
108 {
109  typedef typename detail::pp_array_type<T>::type I;
110  enum { N = pp_array_elems<T>::elems };
111 
112  for (std::size_t i = 0; i < N; ++i)
113  create<I>(&(*ptr)[i], std::forward<Args>(args)...);
114 }
115 
116 /*
117  * Calls object's destructor.
118  */
119 template <typename T,
120  typename = typename std::enable_if<!std::is_pod<T>::value>::type>
121 void
122 destroy(typename if_not_array<T>::type &arg)
123 {
124  arg.~T();
125 }
126 
127 /*
128  * Don't call destructors for POD types.
129  */
130 template <typename T, typename dummy = void,
131  typename = typename std::enable_if<std::is_pod<T>::value>::type>
132 void
133 destroy(typename if_not_array<T>::type &arg)
134 {
135 }
136 
137 /*
138  * Recursively calls array's elements' destructors.
139  */
140 template <typename T>
141 void
142 destroy(typename if_size_array<T>::type &arg)
143 {
144  typedef typename detail::pp_array_type<T>::type I;
145  enum { N = pp_array_elems<T>::elems };
146 
147  for (std::size_t i = 0; i < N; ++i)
148  destroy<I>(arg[N - 1 - i]);
149 }
150 
151 } /* namespace detail */
152 
153 } /* namespace pmem */
154 
155 #endif /* LIBPMEMOBJ_DESTROYER_HPP */
Common array traits.
Definition: allocator.hpp:48