libstdc++

initializer_list
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1 // std::initializer_list support -*- C++ -*-
2
3 // Copyright (C) 2008-2013 Free Software Foundation, Inc.
4 //
5 // This file is part of GCC.
6 //
7 // GCC is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 3, or (at your option)
10 // any later version.
11 //
12 // GCC is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 //
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
20
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
25
26 /** @file initializer_list
27 * This is a Standard C++ Library header.
28 */
29
30 #ifndef _INITIALIZER_LIST
31 #define _INITIALIZER_LIST
32
33 #pragma GCC system_header
34
35 #if __cplusplus < 201103L
36 # include <bits/c++0x_warning.h>
37 #else // C++0x
38
39 #pragma GCC visibility push(default)
40
41 #include <bits/c++config.h>
42
43 namespace std
44 {
45 /// initializer_list
46 template<class _E>
47 class initializer_list
48 {
49 public:
50 typedef _E value_type;
51 typedef const _E& reference;
52 typedef const _E& const_reference;
53 typedef size_t size_type;
54 typedef const _E* iterator;
55 typedef const _E* const_iterator;
56
57 private:
58 iterator _M_array;
59 size_type _M_len;
60
61 // The compiler can call a private constructor.
62 constexpr initializer_list(const_iterator __a, size_type __l)
63 : _M_array(__a), _M_len(__l) { }
64
65 public:
66 constexpr initializer_list() noexcept
67 : _M_array(0), _M_len(0) { }
68
69 // Number of elements.
70 constexpr size_type
71 size() const noexcept { return _M_len; }
72
73 // First element.
74 constexpr const_iterator
75 begin() const noexcept { return _M_array; }
76
77 // One past the last element.
78 constexpr const_iterator
79 end() const noexcept { return begin() + size(); }
80 };
81
82 /**
83 * @brief Return an iterator pointing to the first element of
84 * the initilizer_list.
85 * @param __ils Initializer list.
86 */
87 template<class _Tp>
88 constexpr const _Tp*
89 begin(initializer_list<_Tp> __ils) noexcept
90 { return __ils.begin(); }
91
92 /**
93 * @brief Return an iterator pointing to one past the last element
94 * of the initilizer_list.
95 * @param __ils Initializer list.
96 */
97 template<class _Tp>
98 constexpr const _Tp*
99 end(initializer_list<_Tp> __ils) noexcept
100 { return __ils.end(); }
101 }
102
103 #pragma GCC visibility pop
104
105 #endif // C++11
106
107 #endif // _INITIALIZER_LIST