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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/contrib/llvm-project/libcxx/include/__expected/bad_expected_access.h
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// -*- 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___EXPECTED_BAD_EXPECTED_ACCESS_H

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#define _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H

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#include <__config>

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#include <__exception/exception.h>

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#include <__utility/move.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_PUSH_MACROS

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#include <__undef_macros>

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#if _LIBCPP_STD_VER >= 23

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_LIBCPP_BEGIN_NAMESPACE_STD

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template <class _Err>

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class bad_expected_access;

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_LIBCPP_DIAGNOSTIC_PUSH

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#  if !_LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION

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_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wweak-vtables")

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#  endif

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template <>

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class _LIBCPP_EXPORTED_FROM_ABI bad_expected_access<void> : public exception {

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protected:

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  _LIBCPP_HIDE_FROM_ABI bad_expected_access() noexcept                                      = default;

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  _LIBCPP_HIDE_FROM_ABI bad_expected_access(const bad_expected_access&) noexcept            = default;

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  _LIBCPP_HIDE_FROM_ABI bad_expected_access(bad_expected_access&&) noexcept                 = default;

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  _LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(const bad_expected_access&) noexcept = default;

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  _LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(bad_expected_access&&) noexcept      = default;

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  _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~bad_expected_access() override                             = default;

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public:

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#  if _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION

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  const char* what() const noexcept override;

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#  else

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  _LIBCPP_HIDE_FROM_ABI_VIRTUAL const char* what() const noexcept override { return "bad access to std::expected"; }

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#  endif

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};

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_LIBCPP_DIAGNOSTIC_POP

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template <class _Err>

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class bad_expected_access : public bad_expected_access<void> {

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public:

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  _LIBCPP_HIDE_FROM_ABI explicit bad_expected_access(_Err __e) : __unex_(std::move(__e)) {}

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  _LIBCPP_HIDE_FROM_ABI _Err& error() & noexcept { return __unex_; }

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  _LIBCPP_HIDE_FROM_ABI const _Err& error() const& noexcept { return __unex_; }

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  _LIBCPP_HIDE_FROM_ABI _Err&& error() && noexcept { return std::move(__unex_); }

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  _LIBCPP_HIDE_FROM_ABI const _Err&& error() const&& noexcept { return std::move(__unex_); }

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private:

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  _Err __unex_;

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};

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_LIBCPP_END_NAMESPACE_STD

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#endif // _LIBCPP_STD_VER >= 23

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_LIBCPP_POP_MACROS

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#endif // _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H

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