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
30namespace ranges
31{
32
33// [range.range], ranges
34
35template <class>
36inline 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