1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 #ifndef _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H 10 #define _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H 11 12 #include <__config> 13 #include <__exception/exception.h> 14 #include <__utility/move.h> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_PUSH_MACROS 21 #include <__undef_macros> 22 23 #if _LIBCPP_STD_VER >= 23 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 template <class _Err> 28 class bad_expected_access; 29 30 _LIBCPP_DIAGNOSTIC_PUSH 31 # if !_LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION 32 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wweak-vtables") 33 # endif 34 template <> 35 class _LIBCPP_EXPORTED_FROM_ABI bad_expected_access<void> : public exception { 36 protected: 37 _LIBCPP_HIDE_FROM_ABI bad_expected_access() noexcept = default; 38 _LIBCPP_HIDE_FROM_ABI bad_expected_access(const bad_expected_access&) noexcept = default; 39 _LIBCPP_HIDE_FROM_ABI bad_expected_access(bad_expected_access&&) noexcept = default; 40 _LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(const bad_expected_access&) noexcept = default; 41 _LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(bad_expected_access&&) noexcept = default; 42 _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~bad_expected_access() override = default; 43 44 public: 45 # if _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION 46 const char* what() const noexcept override; 47 # else 48 _LIBCPP_HIDE_FROM_ABI_VIRTUAL const char* what() const noexcept override { return "bad access to std::expected"; } 49 # endif 50 }; 51 _LIBCPP_DIAGNOSTIC_POP 52 53 template <class _Err> 54 class bad_expected_access : public bad_expected_access<void> { 55 public: bad_expected_access(_Err __e)56 _LIBCPP_HIDE_FROM_ABI explicit bad_expected_access(_Err __e) : __unex_(std::move(__e)) {} 57 error()58 _LIBCPP_HIDE_FROM_ABI _Err& error() & noexcept { return __unex_; } error()59 _LIBCPP_HIDE_FROM_ABI const _Err& error() const& noexcept { return __unex_; } error()60 _LIBCPP_HIDE_FROM_ABI _Err&& error() && noexcept { return std::move(__unex_); } error()61 _LIBCPP_HIDE_FROM_ABI const _Err&& error() const&& noexcept { return std::move(__unex_); } 62 63 private: 64 _Err __unex_; 65 }; 66 67 _LIBCPP_END_NAMESPACE_STD 68 69 #endif // _LIBCPP_STD_VER >= 23 70 71 _LIBCPP_POP_MACROS 72 73 #endif // _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H 74