v1/__fwd/variant.h

0001 //===---------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===---------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___FWD_VARIANT_H
0010 #define _LIBCPP___FWD_VARIANT_H
0011
0012 #include <__config>
0013 #include <__cstddef/size_t.h>
0014
0015 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0016 #  pragma GCC system_header
0017 #endif
0018
0019 _LIBCPP_BEGIN_NAMESPACE_STD
0020
0021 #if _LIBCPP_STD_VER >= 17
0022
0023 template <class... _Types>
0024 class _LIBCPP_TEMPLATE_VIS variant;
0025
0026 template <class _Tp>
0027 struct _LIBCPP_TEMPLATE_VIS variant_size;
0028
0029 template <class _Tp>
0030 inline constexpr size_t variant_size_v = variant_size<_Tp>::value;
0031
0032 template <size_t _Ip, class _Tp>
0033 struct _LIBCPP_TEMPLATE_VIS variant_alternative;
0034
0035 template <size_t _Ip, class _Tp>
0036 using variant_alternative_t = typename variant_alternative<_Ip, _Tp>::type;
0037
0038 inline constexpr size_t variant_npos = static_cast<size_t>(-1);
0039
0040 template <size_t _Ip, class... _Types>
0041 _LIBCPP_HIDE_FROM_ABI
0042 _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr variant_alternative_t<_Ip, variant<_Types...>>&
0043 get(variant<_Types...>&);
0044
0045 template <size_t _Ip, class... _Types>
0046 _LIBCPP_HIDE_FROM_ABI
0047 _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr variant_alternative_t<_Ip, variant<_Types...>>&&
0048 get(variant<_Types...>&&);
0049
0050 template <size_t _Ip, class... _Types>
0051 _LIBCPP_HIDE_FROM_ABI
0052 _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const variant_alternative_t<_Ip, variant<_Types...>>&
0053 get(const variant<_Types...>&);
0054
0055 template <size_t _Ip, class... _Types>
0056 _LIBCPP_HIDE_FROM_ABI
0057 _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const variant_alternative_t<_Ip, variant<_Types...>>&&
0058 get(const variant<_Types...>&&);
0059
0060 template <class _Tp, class... _Types>
0061 _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr _Tp& get(variant<_Types...>&);
0062
0063 template <class _Tp, class... _Types>
0064 _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr _Tp&& get(variant<_Types...>&&);
0065
0066 template <class _Tp, class... _Types>
0067 _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const _Tp& get(const variant<_Types...>&);
0068
0069 template <class _Tp, class... _Types>
0070 _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const _Tp&&
0071 get(const variant<_Types...>&&);
0072
0073 #endif // _LIBCPP_STD_VER >= 17
0074
0075 _LIBCPP_END_NAMESPACE_STD
0076
0077 #endif // _LIBCPP___FWD_VARIANT_H