Changeset View

Standalone View

				// -- C++ --
				//===----------------------------------------------------------------------===//
				//
				// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
				// See https://llvm.org/LICENSE.txt for license information.
				// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
				//
				//===----------------------------------------------------------------------===//

				#ifndef _LIBCPP___RANGES_VIEW_H
				#define _LIBCPP___RANGES_VIEW_H

				#include <__config>
				#include <__ranges/concepts.h>
				#include <concepts>


				#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
				#pragma GCC system_header
				#endif

				_LIBCPP_PUSH_MACROS
				#include <__undef_macros>

				_LIBCPP_BEGIN_NAMESPACE_STD

				#if !defined(_LIBCPP_HAS_NO_RANGES)

				namespace ranges {

				struct view_base { };

				template <class _Tp>
				inline constexpr bool enable_view = derived_from<_Tp, view_base>;

				template <class _Tp>
				concept view =
				range<_Tp> &&
				movable<_Tp> &&
				default_initializable<_Tp> &&
				enable_view<_Tp>;

				} // end namespace ranges

				#endif // !_LIBCPP_HAS_NO_RANGES

				_LIBCPP_END_NAMESPACE_STD

				_LIBCPP_POP_MACROS

				#endif // _LIBCPP___RANGES_VIEW_H