libstdc++
elements_of.h
1 // Tag type for yielding ranges rather than values in <generator> -*- C++ -*-
2 
3 // Copyright (C) 2023-2025 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10 
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15 
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 #ifndef _GLIBCXX_BITS_ELEMENTS_OF
26 #define _GLIBCXX_BITS_ELEMENTS_OF
27 
28 #ifdef _GLIBCXX_SYSHDR
29 #pragma GCC system_header
30 #endif
31 
32 #include <bits/c++config.h>
33 
34 #include <bits/version.h>
35 
36 // C++ >= 23 && __glibcxx_coroutine
37 #if defined(__glibcxx_ranges) && defined(__glibcxx_generator)
38 #include <bits/ranges_base.h>
39 #include <bits/memoryfwd.h>
40 
41 #if _GLIBCXX_HOSTED
42 # include <bits/allocator.h> // likely desirable if hosted.
43 #endif // HOSTED
44 
45 namespace std _GLIBCXX_VISIBILITY(default)
46 {
47 _GLIBCXX_BEGIN_NAMESPACE_VERSION
48 namespace ranges
49 {
50 
51  /**
52  * @ingroup ranges
53  * @since C++23
54  * @{
55  */
56 
57  template<range _Range, typename _Alloc = allocator<byte>>
58  struct elements_of
59  {
60  [[no_unique_address]] _Range range;
61  [[no_unique_address]] _Alloc allocator = _Alloc();
62  };
63 
64  template<typename _Range, typename _Alloc = allocator<byte>>
65  elements_of(_Range&&, _Alloc = _Alloc())
66  -> elements_of<_Range&&, _Alloc>;
67 
68  /// @}
69 }
70 _GLIBCXX_END_NAMESPACE_VERSION
71 } // namespace std
72 
73 #endif // __glibcxx_generator && __glibcxx_ranges
74 #endif // _GLIBCXX_BITS_ELEMENTS_OF
ISO C++ entities toplevel namespace is std.