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      1 // Tag type for yielding ranges rather than values in <generator>  -*- C++ -*-
      2 
      3 // Copyright (C) 2023-2024 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 #pragma GCC system_header
     29 
     30 #include <bits/c++config.h>
     31 
     32 #include <bits/version.h>
     33 
     34 // C++ >= 23 && __glibcxx_coroutine
     35 #if defined(__glibcxx_ranges) && defined(__glibcxx_generator)
     36 #include <bits/ranges_base.h>
     37 #include <bits/memoryfwd.h>
     38 
     39 #if _GLIBCXX_HOSTED
     40 # include <bits/allocator.h> // likely desirable if hosted.
     41 #endif  // HOSTED
     42 
     43 namespace std _GLIBCXX_VISIBILITY(default)
     44 {
     45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     46 namespace ranges
     47 {
     48 
     49   /**
     50    * @ingroup ranges
     51    * @since C++23
     52    * @{
     53    */
     54 
     55   template<range _Range, typename _Alloc = allocator<byte>>
     56     struct elements_of
     57     {
     58       [[no_unique_address]] _Range range;
     59       [[no_unique_address]] _Alloc allocator = _Alloc();
     60     };
     61 
     62   template<typename _Range, typename _Alloc = allocator<byte>>
     63     elements_of(_Range&&, _Alloc = _Alloc())
     64       -> elements_of<_Range&&, _Alloc>;
     65 
     66   /// @}
     67 }
     68 _GLIBCXX_END_NAMESPACE_VERSION
     69 } // namespace std
     70 
     71 #endif  // __glibcxx_generator && __glibcxx_ranges
     72 #endif  // _GLIBCXX_BITS_ELEMENTS_OF
     73