22629bb22a
This patch uses our availability machinery to allow defining a key function for bad_function_call and bad_expected_access at all times but only rely on it when we can. This prevents compilers from complaining about weak vtables and reduces code bloat and the amount of work done by the dynamic linker. rdar://111917845
75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
// -*- 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 <__availability>
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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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