1 // -*- C++ -*-
2 //===------------------ __ranges/enable_borrowed_range.h ------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H
11 #define _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H
12 
13 // These customization variables are used in <span> and <string_view>. The
14 // separate header is used to avoid including the entire <ranges> header in
15 // <span> and <string_view>.
16 
17 #include <__config>
18 
19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20 #pragma GCC system_header
21 #endif
22 
23 _LIBCPP_PUSH_MACROS
24 #include <__undef_macros>
25 
26 _LIBCPP_BEGIN_NAMESPACE_STD
27 
28 #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_RANGES)
29 
30 namespace ranges
31 {
32 
33 // [range.range], ranges
34 
35 template <class>
36 inline constexpr bool enable_borrowed_range = false;
37 
38 } // namespace ranges
39 
40 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_RANGES)
41 
42 _LIBCPP_END_NAMESPACE_STD
43 
44 _LIBCPP_POP_MACROS
45 
46 #endif // _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H
47