libcxx/include/__ranges/enable_borrowed_range.h

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   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_BEGIN_NAMESPACE_STD
  24
  25 #if _LIBCPP_STD_VER >= 20
  26
  27 namespace ranges {
  28
  29 // [range.range], ranges
  30
  31 template <class>
  32 inline constexpr bool enable_borrowed_range = false;
  33
  34 } // namespace ranges
  35
  36 #endif // _LIBCPP_STD_VER >= 20
  37
  38 _LIBCPP_END_NAMESPACE_STD
  39
  40 #endif // _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H