forked from OSchip/llvm-project
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___RANGES_EMPTY_VIEW_H
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#define _LIBCPP___RANGES_EMPTY_VIEW_H
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#include <__config>
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#include <__ranges/view_interface.h>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if !defined(_LIBCPP_HAS_NO_RANGES)
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namespace ranges {
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template<class _Tp>
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requires is_object_v<_Tp>
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class empty_view : public view_interface<empty_view<_Tp>> {
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public:
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static constexpr _Tp* begin() noexcept { return nullptr; }
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static constexpr _Tp* end() noexcept { return nullptr; }
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static constexpr _Tp* data() noexcept { return nullptr; }
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static constexpr size_t size() noexcept { return 0; }
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static constexpr bool empty() noexcept { return true; }
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};
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} // namespace ranges
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#endif // !defined(_LIBCPP_HAS_NO_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___RANGES_EMPTY_VIEW_H
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