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