7ded638ea3
Certain headers require `optional<T&>`, so it may be beneficial to split out `optional<T>` and `optional<T&>`. This can allow consumers to only bring in the `optional` flavour it needs.. - Parcel out the respective pieces into their own header. - Certain sources rely on transitive includes brought in by `<optional>`, so they're kept there for now, and only tests have been fixed. --------- Co-authored-by: Louis Dionne <ldionne.2@gmail.com>
40 lines
1 KiB
C++
40 lines
1 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___OPTIONAL_NULLOPT_T_H
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#define _LIBCPP___OPTIONAL_NULLOPT_T_H
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#include <__config>
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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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#if _LIBCPP_STD_VER >= 17
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_LIBCPP_BEGIN_NAMESPACE_STD
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struct nullopt_t {
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struct __secret_tag {
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explicit __secret_tag() = default;
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};
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_LIBCPP_HIDE_FROM_ABI constexpr explicit nullopt_t(__secret_tag, __secret_tag) noexcept {}
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};
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inline constexpr nullopt_t nullopt{nullopt_t::__secret_tag{}, nullopt_t::__secret_tag{}};
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 17
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___OPTIONAL_NULLOPT_T_H
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