__cxx03/__ranges/enable_borrowed_range.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___CXX03___RANGES_ENABLE_BORROWED_RANGE_H
0011 #define _LIBCPP___CXX03___RANGES_ENABLE_BORROWED_RANGE_H
0012
0013 // These customization variables are used in <span> and <string_view>. The
0014 // separate header is used to avoid including the entire <ranges> header in
0015 // <span> and <string_view>.
0016
0017 #include <__cxx03/__config>
0018
0019 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0020 #  pragma GCC system_header
0021 #endif
0022
0023 _LIBCPP_BEGIN_NAMESPACE_STD
0024
0025 #if _LIBCPP_STD_VER >= 20
0026
0027 namespace ranges {
0028
0029 // [range.range], ranges
0030
0031 template <class>
0032 inline constexpr bool enable_borrowed_range = false;
0033
0034 } // namespace ranges
0035
0036 #endif // _LIBCPP_STD_VER >= 20
0037
0038 _LIBCPP_END_NAMESPACE_STD
0039
0040 #endif // _LIBCPP___CXX03___RANGES_ENABLE_BORROWED_RANGE_H