libstdc++
initializer_list
Go to the documentation of this file.
1 // std::initializer_list support -*- C++ -*-
2 
3 // Copyright (C) 2008, 2009, 2010 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 #ifdef __GXX_EXPERIMENTAL_CXX0X__
36 
37 #pragma GCC visibility push(default)
38 
39 #include <bits/c++config.h>
40 
41 namespace std
42 {
43  /// initializer_list
44  template<class _E>
46  {
47  public:
48  typedef _E value_type;
49  typedef const _E& reference;
50  typedef const _E& const_reference;
51  typedef size_t size_type;
52  typedef const _E* iterator;
53  typedef const _E* const_iterator;
54 
55  private:
56  iterator _M_array;
57  size_type _M_len;
58 
59  // The compiler can call a private constructor.
60  constexpr initializer_list(const_iterator __a, size_type __l)
61  : _M_array(__a), _M_len(__l) { }
62 
63  public:
64  constexpr initializer_list() : _M_array(0), _M_len(0) { }
65 
66  // Number of elements.
67  constexpr size_type
68  size() { return _M_len; }
69 
70  // First element.
71  constexpr const_iterator
72  begin() { return _M_array; }
73 
74  // One past the last element.
75  constexpr const_iterator
76  end() { return begin() + size(); }
77  };
78 
79  /**
80  * @brief Return an iterator pointing to the first element of
81  * the initilizer_list.
82  * @param il Initializer list.
83  */
84  template<class _Tp>
85  constexpr const _Tp*
87  { return __ils.begin(); }
88 
89  /**
90  * @brief Return an iterator pointing to one past the last element
91  * of the initilizer_list.
92  * @param il Initializer list.
93  */
94  template<class _Tp>
95  constexpr const _Tp*
97  { return __ils.end(); }
98 }
99 
100 #pragma GCC visibility pop
101 #endif // C++0x
102 #endif // _INITIALIZER_LIST
constexpr const _Tp * begin(initializer_list< _Tp > __ils)
Return an iterator pointing to the first element of the initilizer_list.
initializer_list
constexpr const _Tp * end(initializer_list< _Tp > __ils)
Return an iterator pointing to one past the last element of the initilizer_list.