PMDK C++ bindings  1.13.0-git23.gf49772ac
This is the C++ bindings documentation for PMDK's libpmemobj.
integer_sequence.hpp
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1 // SPDX-License-Identifier: BSD-3-Clause
2 /* Copyright 2016-2020, Intel Corporation */
3 
9 #ifndef LIBPMEMOBJ_CPP_INTEGER_SEQUENCE_HPP
10 #define LIBPMEMOBJ_CPP_INTEGER_SEQUENCE_HPP
11 
12 #include <cstddef>
13 
14 namespace pmem
15 {
16 
17 namespace detail
18 {
19 
20 /*
21  * Base index type template.
22  */
23 template <typename T, T...>
24 struct integer_sequence {
25 };
26 
27 /*
28  * Size_t specialization of the integer sequence.
29  */
30 template <size_t... Indices>
31 using index_sequence = integer_sequence<size_t, Indices...>;
32 
33 /*
34  * Empty base class.
35  *
36  * Subject of empty base optimization.
37  */
38 template <typename T, T I, typename... Types>
39 struct make_integer_seq_impl;
40 
41 /*
42  * Class ending recursive variadic template peeling.
43  */
44 template <typename T, T I, T... Indices>
45 struct make_integer_seq_impl<T, I, integer_sequence<T, Indices...>> {
46  typedef integer_sequence<T, Indices...> type;
47 };
48 
49 /*
50  * Recursively create index while peeling off the types.
51  */
52 template <typename N, N I, N... Indices, typename T, typename... Types>
53 struct make_integer_seq_impl<N, I, integer_sequence<N, Indices...>, T,
54  Types...> {
55  typedef typename make_integer_seq_impl<
56  N, I + 1, integer_sequence<N, Indices..., I>, Types...>::type
57  type;
58 };
59 
60 /*
61  * Make index sequence entry point.
62  */
63 template <typename... Types>
64 using make_index_sequence =
65  make_integer_seq_impl<size_t, 0, integer_sequence<size_t>, Types...>;
66 
67 /*
68  * A helper alias template to convert any type parameter pack into an index
69  * sequence of the same length. Analog of std::index_sequence_for.
70  */
71 template <class... Types>
72 using index_sequence_for = typename make_index_sequence<Types...>::type;
73 
74 } /* namespace detail */
75 
76 } /* namespace pmem */
77 
78 #endif /* LIBPMEMOBJ_CPP_INTEGER_SEQUENCE_HPP */
Persistent memory namespace.
Definition: allocation_flag.hpp:15