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//
// 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
// SPDX-FileCopyrightText: Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___EXPECTED_UNEXPECTED_H
#define _LIBCUDACXX___EXPECTED_UNEXPECTED_H
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
#include "../__concepts/__concept_macros.h"
#include "../__type_traits/integral_constant.h"
#include "../__type_traits/is_array.h"
#include "../__type_traits/is_const.h"
#include "../__type_traits/is_constructible.h"
#include "../__type_traits/is_nothrow_constructible.h"
#include "../__type_traits/is_object.h"
#include "../__type_traits/is_same.h"
#include "../__type_traits/is_swappable.h"
#include "../__type_traits/is_volatile.h"
#include "../__type_traits/remove_cvref.h"
#include "../__utility/forward.h"
#include "../__utility/in_place.h"
#include "../__utility/move.h"
#include "../initializer_list"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _LIBCUDACXX_STD_VER > 11
template <class _Err>
class unexpected;
namespace __unexpected {
template <class _Tp>
_LIBCUDACXX_INLINE_VAR constexpr bool __is_unexpected = false;
template <class _Err>
_LIBCUDACXX_INLINE_VAR constexpr bool __is_unexpected<unexpected<_Err>> = true;
template <class _Tp>
_LIBCUDACXX_INLINE_VAR constexpr bool __valid_unexpected = _LIBCUDACXX_TRAIT(is_object, _Tp) &&
!_LIBCUDACXX_TRAIT(is_array, _Tp) &&
!__is_unexpected<_Tp> &&
!_LIBCUDACXX_TRAIT(is_const, _Tp) &&
!_LIBCUDACXX_TRAIT(is_volatile, _Tp);
} // namespace __unexpected
// [expected.un.general]
template <class _Err>
class unexpected {
static_assert(__unexpected::__valid_unexpected<_Err>,
"[expected.un.general] states a program that instantiates std::unexpected for a non-object type, an "
"array type, a specialization of unexpected, or a cv-qualified type is ill-formed.");
template <class, class>
friend class expected;
public:
// [expected.un.ctor]
_LIBCUDACXX_HIDE_FROM_ABI unexpected(const unexpected&) = default;
_LIBCUDACXX_HIDE_FROM_ABI unexpected(unexpected&&) = default;
_LIBCUDACXX_TEMPLATE(class _Error = _Err)
_LIBCUDACXX_REQUIRES( (!_LIBCUDACXX_TRAIT(is_same, remove_cvref_t<_Error>, unexpected) &&
!_LIBCUDACXX_TRAIT(is_same, remove_cvref_t<_Error>, in_place_t) &&
_LIBCUDACXX_TRAIT(is_constructible, _Err, _Error)))
_LIBCUDACXX_INLINE_VISIBILITY
constexpr explicit unexpected(_Error&& __error) noexcept(_LIBCUDACXX_TRAIT(is_nothrow_constructible, _Err, _Error))
: __unex_(_CUDA_VSTD::forward<_Error>(__error)) {}
_LIBCUDACXX_TEMPLATE(class... _Args)
_LIBCUDACXX_REQUIRES( _LIBCUDACXX_TRAIT(is_constructible, _Err, _Args...))
_LIBCUDACXX_INLINE_VISIBILITY
constexpr explicit unexpected(in_place_t, _Args&&... __args) noexcept(_LIBCUDACXX_TRAIT(is_nothrow_constructible, _Err, _Args...))
: __unex_(_CUDA_VSTD::forward<_Args>(__args)...) {}
_LIBCUDACXX_TEMPLATE(class _Up, class... _Args)
_LIBCUDACXX_REQUIRES( _LIBCUDACXX_TRAIT(is_constructible, _Err, initializer_list<_Up>&, _Args...))
_LIBCUDACXX_INLINE_VISIBILITY
constexpr explicit unexpected(in_place_t, initializer_list<_Up> __il, _Args&&... __args) noexcept(
_LIBCUDACXX_TRAIT(is_nothrow_constructible, _Err, initializer_list<_Up>&, _Args...))
: __unex_(__il, _CUDA_VSTD::forward<_Args>(__args)...) {}
constexpr unexpected& operator=(const unexpected&) = default;
constexpr unexpected& operator=(unexpected&&) = default;
// [expected.un.obs]
_LIBCUDACXX_NODISCARD_ATTRIBUTE _LIBCUDACXX_INLINE_VISIBILITY
constexpr const _Err& error() const& noexcept {
return __unex_;
}
_LIBCUDACXX_NODISCARD_ATTRIBUTE _LIBCUDACXX_INLINE_VISIBILITY
constexpr _Err& error() & noexcept {
return __unex_;
}
_LIBCUDACXX_NODISCARD_ATTRIBUTE _LIBCUDACXX_INLINE_VISIBILITY
constexpr const _Err&& error() const&& noexcept {
return _CUDA_VSTD::move(__unex_);
}
_LIBCUDACXX_NODISCARD_ATTRIBUTE _LIBCUDACXX_INLINE_VISIBILITY
constexpr _Err&& error() && noexcept {
return _CUDA_VSTD::move(__unex_);
}
// [expected.un.swap]
_LIBCUDACXX_INLINE_VISIBILITY
constexpr void swap(unexpected& __other) noexcept(_LIBCUDACXX_TRAIT(is_nothrow_swappable, _Err)) {
static_assert(_LIBCUDACXX_TRAIT(is_swappable, _Err), "E must be swappable");
using _CUDA_VSTD::swap;
swap(__unex_, __other.__unex_);
}
_LIBCUDACXX_TEMPLATE(class _Err2 = _Err)
_LIBCUDACXX_REQUIRES( _LIBCUDACXX_TRAIT(is_swappable, _Err2))
friend _LIBCUDACXX_INLINE_VISIBILITY constexpr
void swap(unexpected& __lhs, unexpected& __rhs) noexcept(_LIBCUDACXX_TRAIT(is_nothrow_swappable, _Err2))
{
__lhs.swap(__rhs);
return;
}
// [expected.un.eq]
template <class _UErr>
friend _LIBCUDACXX_INLINE_VISIBILITY constexpr
_LIBCUDACXX_NODISCARD_EXT bool operator==(const unexpected& __lhs, const unexpected<_UErr>& __rhs) noexcept(
noexcept(static_cast<bool>(__lhs.error() == __rhs.error()))) {
return __lhs.error() == __rhs.error();
}
#if _LIBCUDACXX_STD_VER < 20
template <class _UErr>
_LIBCUDACXX_INLINE_VISIBILITY
_LIBCUDACXX_NODISCARD_EXT friend constexpr bool operator!=(const unexpected& __lhs, const unexpected<_UErr>& __rhs) noexcept(
noexcept(static_cast<bool>(__lhs.error() != __rhs.error()))) {
return __lhs.error() != __rhs.error();
}
#endif
private:
_Err __unex_;
};
#if _LIBCUDACXX_STD_VER > 14 && !defined(_LIBCUDACXX_HAS_NO_DEDUCTION_GUIDES)
template <class _Err>
unexpected(_Err) -> unexpected<_Err>;
#endif // _LIBCUDACXX_STD_VER > 14 && !defined(_LIBCUDACXX_HAS_NO_DEDUCTION_GUIDES)
#endif // _LIBCUDACXX_STD_VER > 11
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___EXPECTED_UNEXPECTED_H
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