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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===--- MSVCErrorWorkarounds.h - Enable future<Error> in MSVC --*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // MSVC's promise/future implementation requires types to be default |
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| 10 | // constructible, so this header provides analogues of Error an Expected |
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| 11 | // that are default constructed in a safely destructible state. |
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| 12 | // |
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| 13 | // FIXME: Kill off this header and migrate all users to Error/Expected once we |
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| 14 | // move to MSVC versions that support non-default-constructible types. |
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| 15 | // |
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| 16 | //===----------------------------------------------------------------------===// |
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| 17 | |||
| 18 | #ifndef LLVM_SUPPORT_MSVCERRORWORKAROUNDS_H |
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| 19 | #define LLVM_SUPPORT_MSVCERRORWORKAROUNDS_H |
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| 20 | |||
| 21 | #include "llvm/Support/Error.h" |
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| 22 | |||
| 23 | namespace llvm { |
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| 24 | |||
| 25 | // A default-constructible llvm::Error that is suitable for use with MSVC's |
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| 26 | // std::future implementation which requires default constructible types. |
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| 27 | class MSVCPError : public Error { |
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| 28 | public: |
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| 29 | MSVCPError() { (void)!!*this; } |
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| 30 | |||
| 31 | MSVCPError(MSVCPError &&Other) : Error(std::move(Other)) {} |
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| 32 | |||
| 33 | MSVCPError &operator=(MSVCPError Other) { |
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| 34 | Error::operator=(std::move(Other)); |
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| 35 | return *this; |
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| 36 | } |
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| 37 | |||
| 38 | MSVCPError(Error Err) : Error(std::move(Err)) {} |
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| 39 | }; |
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| 40 | |||
| 41 | // A default-constructible llvm::Expected that is suitable for use with MSVC's |
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| 42 | // std::future implementation, which requires default constructible types. |
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| 43 | template <typename T> class MSVCPExpected : public Expected<T> { |
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| 44 | public: |
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| 45 | MSVCPExpected() |
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| 46 | : Expected<T>(make_error<StringError>("", inconvertibleErrorCode())) { |
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| 47 | consumeError(this->takeError()); |
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| 48 | } |
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| 49 | |||
| 50 | MSVCPExpected(MSVCPExpected &&Other) : Expected<T>(std::move(Other)) {} |
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| 51 | |||
| 52 | MSVCPExpected &operator=(MSVCPExpected &&Other) { |
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| 53 | Expected<T>::operator=(std::move(Other)); |
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| 54 | return *this; |
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| 55 | } |
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| 56 | |||
| 57 | MSVCPExpected(Error Err) : Expected<T>(std::move(Err)) {} |
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| 58 | |||
| 59 | template <typename OtherT> |
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| 60 | MSVCPExpected( |
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| 61 | OtherT &&Val, |
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| 62 | std::enable_if_t<std::is_convertible<OtherT, T>::value> * = nullptr) |
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| 63 | : Expected<T>(std::move(Val)) {} |
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| 64 | |||
| 65 | template <class OtherT> |
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| 66 | MSVCPExpected( |
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| 67 | Expected<OtherT> &&Other, |
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| 68 | std::enable_if_t<std::is_convertible<OtherT, T>::value> * = nullptr) |
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| 69 | : Expected<T>(std::move(Other)) {} |
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| 70 | |||
| 71 | template <class OtherT> |
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| 72 | explicit MSVCPExpected( |
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| 73 | Expected<OtherT> &&Other, |
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| 74 | std::enable_if_t<!std::is_convertible<OtherT, T>::value> * = nullptr) |
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| 75 | : Expected<T>(std::move(Other)) {} |
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| 76 | }; |
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| 77 | |||
| 78 | } // end namespace llvm |
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| 79 | |||
| 80 | #endif // LLVM_SUPPORT_MSVCERRORWORKAROUNDS_H |