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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H
#define _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H
#include <__config>
#include <__exception/exception.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
#if _LIBCPP_STD_VER >= 20
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Err>
class bad_expected_access;
template <>
class bad_expected_access<void> : public exception {
protected:
_LIBCPP_HIDE_FROM_ABI bad_expected_access() noexcept = default;
_LIBCPP_HIDE_FROM_ABI bad_expected_access(const bad_expected_access&) = default;
_LIBCPP_HIDE_FROM_ABI bad_expected_access(bad_expected_access&&) = default;
_LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(const bad_expected_access&) = default;
_LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(bad_expected_access&&) = default;
_LIBCPP_HIDE_FROM_ABI_VIRTUAL ~bad_expected_access() override = default;
public:
// The way this has been designed (by using a class template below) means that we'll already
// have a profusion of these vtables in TUs, and the dynamic linker will already have a bunch
// of work to do. So it is not worth hiding the <void> specialization in the dylib, given that
// it adds deployment target restrictions.
_LIBCPP_HIDE_FROM_ABI_VIRTUAL const char* what() const noexcept override { return "bad access to std::expected"; }
};
template <class _Err>
class bad_expected_access : public bad_expected_access<void> {
public:
_LIBCPP_HIDE_FROM_ABI explicit bad_expected_access(_Err __e) : __unex_(std::move(__e)) {}
_LIBCPP_HIDE_FROM_ABI _Err& error() & noexcept { return __unex_; }
_LIBCPP_HIDE_FROM_ABI const _Err& error() const& noexcept { return __unex_; }
_LIBCPP_HIDE_FROM_ABI _Err&& error() && noexcept { return std::move(__unex_); }
_LIBCPP_HIDE_FROM_ABI const _Err&& error() const&& noexcept { return std::move(__unex_); }
private:
_Err __unex_;
};
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 23
_LIBCPP_POP_MACROS
#endif // _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H
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