04d3a6be62
This is necessary because e.g. ranges::elements_view uses std::get but it needs to have in scope the declaration of all the versions of std::get that exist in the library. This need is what had originally led to elements_view.h gaining an include of __fwd/complex.h, but in reality it is a more general issue that requires a canonical declration point for all the std::get variations.
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
//===---------------------------------------------------------------------===//
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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___FWD_VARIANT_H
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#define _LIBCPP___FWD_VARIANT_H
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#include <__config>
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#include <__cstddef/size_t.h>
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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_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 17
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template <class... _Types>
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class _LIBCPP_TEMPLATE_VIS variant;
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template <class _Tp>
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struct _LIBCPP_TEMPLATE_VIS variant_size;
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template <class _Tp>
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inline constexpr size_t variant_size_v = variant_size<_Tp>::value;
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template <size_t _Ip, class _Tp>
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struct _LIBCPP_TEMPLATE_VIS variant_alternative;
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template <size_t _Ip, class _Tp>
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using variant_alternative_t = typename variant_alternative<_Ip, _Tp>::type;
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inline constexpr size_t variant_npos = static_cast<size_t>(-1);
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template <size_t _Ip, class... _Types>
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_LIBCPP_HIDE_FROM_ABI
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_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr variant_alternative_t<_Ip, variant<_Types...>>&
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get(variant<_Types...>&);
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template <size_t _Ip, class... _Types>
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_LIBCPP_HIDE_FROM_ABI
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_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr variant_alternative_t<_Ip, variant<_Types...>>&&
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get(variant<_Types...>&&);
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template <size_t _Ip, class... _Types>
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_LIBCPP_HIDE_FROM_ABI
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_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const variant_alternative_t<_Ip, variant<_Types...>>&
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get(const variant<_Types...>&);
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template <size_t _Ip, class... _Types>
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_LIBCPP_HIDE_FROM_ABI
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_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const variant_alternative_t<_Ip, variant<_Types...>>&&
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get(const variant<_Types...>&&);
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template <class _Tp, class... _Types>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr _Tp& get(variant<_Types...>&);
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template <class _Tp, class... _Types>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr _Tp&& get(variant<_Types...>&&);
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template <class _Tp, class... _Types>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const _Tp& get(const variant<_Types...>&);
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template <class _Tp, class... _Types>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const _Tp&&
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get(const variant<_Types...>&&);
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#endif // _LIBCPP_STD_VER >= 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FWD_VARIANT_H
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