llvm::Expected< T > Class Template Reference

Tagged union holding either a T or a Error. More...

#include "llvm/ObjectYAML/yaml2obj.h"

Inheritance diagram for llvm::Expected< T >:

Collaboration diagram for llvm::Expected< T >:

Public Types
using	storage_type = typename std::conditional< isRef, wrap, T >::type
using	value_type = T

Public Member Functions
	Expected (Error Err)
	Create an Expected<T> error value from the given Error. More...
	Expected (ErrorSuccess)=delete
	Forbid to convert from Error::success() implicitly, this avoids having Expected<T> foo() { return Error::success(); } which compiles otherwise but triggers the assertion above. More...
template<typename OtherT >
	Expected (OtherT &&Val, typename std::enable_if< std::is_convertible< OtherT, T >::value >::type *=nullptr)
	Create an Expected<T> success value from the given OtherT value, which must be convertible to T. More...
	Expected (Expected &&Other)
	Move construct an Expected<T> value. More...
template<class OtherT >
	Expected (Expected< OtherT > &&Other, typename std::enable_if< std::is_convertible< OtherT, T >::value >::type *=nullptr)
	Move construct an Expected<T> value from an Expected<OtherT>, where OtherT must be convertible to T. More...
template<class OtherT >
	Expected (Expected< OtherT > &&Other, typename std::enable_if<!std::is_convertible< OtherT, T >::value >::type *=nullptr)
	Move construct an Expected<T> value from an Expected<OtherT>, where OtherT isn't convertible to T. More...
Expected &	operator= (Expected &&Other)
	Move-assign from another Expected<T>. More...
	~Expected ()
	Destroy an Expected<T>. More...
	operator bool ()
	Return false if there is an error. More...
reference	get ()
	Returns a reference to the stored T value. More...
const_reference	get () const
	Returns a const reference to the stored T value. More...
template<typename ErrT >
bool	errorIsA () const
	Check that this Expected<T> is an error of type ErrT. More...
Error	takeError ()
	Take ownership of the stored error. More...
pointer	operator-> ()
	Returns a pointer to the stored T value. More...
const_pointer	operator-> () const
	Returns a const pointer to the stored T value. More...
reference	operator* ()
	Returns a reference to the stored T value. More...
const_reference	operator* () const
	Returns a const reference to the stored T value. More...

Friends
template<class T1 >
class	ExpectedAsOutParameter
template<class OtherT >
class	Expected

Detailed Description

template<class T>
class llvm::Expected< T >

Tagged union holding either a T or a Error.

This class parallels ErrorOr, but replaces error_code with Error. Since Error cannot be copied, this class replaces getError() with takeError(). It also adds an bool errorIsA<ErrT>() method for testing the error class type.

Definition at line 21 of file yaml2obj.h.

Member Typedef Documentation

storage_type

template<class T>

using llvm::Expected< T >::storage_type = typename std::conditional<isRef, wrap, T>::type

Definition at line 444 of file Error.h.

value_type

template<class T>

using llvm::Expected< T >::value_type = T

Definition at line 445 of file Error.h.

Constructor & Destructor Documentation

Expected() [1/6]

template<class T>

llvm::Expected< T >::Expected ( Error  Err )

inline

Create an Expected<T> error value from the given Error.

Definition at line 455 of file Error.h.

Expected() [2/6]

template<class T>

llvm::Expected< T >::Expected ( ErrorSuccess  )

delete

Forbid to convert from Error::success() implicitly, this avoids having Expected<T> foo() { return Error::success(); } which compiles otherwise but triggers the assertion above.

Expected() [3/6]

template<class T>

template<typename OtherT >

llvm::Expected< T >::Expected ( OtherT &&  Val, typename std::enable_if< std::is_convertible< OtherT, T >::value >::type *  = nullptr  )

inline

Create an Expected<T> success value from the given OtherT value, which must be convertible to T.

Definition at line 474 of file Error.h.

Expected() [4/6]

template<class T>

llvm::Expected< T >::Expected ( Expected< T > &&  Other )

inline

Move construct an Expected<T> value.

Definition at line 487 of file Error.h.

References Other.

Expected() [5/6]

template<class T>

template<class OtherT >

llvm::Expected< T >::Expected ( Expected< OtherT > &&  Other, typename std::enable_if< std::is_convertible< OtherT, T >::value >::type *  = nullptr  )

inline

Move construct an Expected<T> value from an Expected<OtherT>, where OtherT must be convertible to T.

Definition at line 492 of file Error.h.

References Other.

Expected() [6/6]

template<class T>

template<class OtherT >

llvm::Expected< T >::Expected ( Expected< OtherT > &&  Other, typename std::enable_if<!std::is_convertible< OtherT, T >::value >::type *  = nullptr  )

inlineexplicit

Move construct an Expected<T> value from an Expected<OtherT>, where OtherT isn't convertible to T.

Definition at line 501 of file Error.h.

References Other.

~Expected()

template<class T>

llvm::Expected< T >::~Expected ( )

inline

Destroy an Expected<T>.

Definition at line 515 of file Error.h.

Member Function Documentation

errorIsA()

template<class T>

template<typename ErrT >

bool llvm::Expected< T >::errorIsA ( ) const

inline

Check that this Expected<T> is an error of type ErrT.

Definition at line 544 of file Error.h.

get() [1/2]

template<class T>

reference llvm::Expected< T >::get ( )

inline

Returns a reference to the stored T value.

Definition at line 532 of file Error.h.

Referenced by llvm::BitstreamCursor::advance(), llvm::BitstreamCursor::advanceSkippingSubblocks(), llvm::BitcodeAnalyzer::analyze(), copyAttributeNamespace(), llvm::object::createBinary(), decode(), llvm::BitstreamCursor::EnterSubBlock(), llvm::object::IRObjectFile::findBitcodeInMemBuffer(), llvm::MCJIT::findSymbol(), llvm::symbolize::LLVMSymbolizer::flush(), llvm::MCJIT::generateCodeForModule(), llvm::object::Archive::Child::getAsBinary(), llvm::getBitcodeFileContents(), llvm::object::Archive::Child::getBuffer(), getDbiStreamPtr(), llvm::object::Archive::Child::getFullName(), llvm::IndexedInstrProfReader::getFunctionCounts(), llvm::object::Archive::Child::getMemoryBufferRef(), llvm::object::ArchiveMemberHeader::getName(), llvm::object::Archive::Child::getName(), llvm::object::Archive::Child::getNext(), llvm::NewArchiveMember::getOldMember(), llvm::object::Archive::Child::getRawSize(), llvm::object::Archive::Child::getSize(), llvm::object::XCOFFObjectFile::getSymbolSection(), llvm::object::XCOFFObjectFile::getSymbolSectionName(), llvm::object::XCOFFSymbolRef::isFunction(), jumpToValueSymbolTable(), LLVMCreateBinary(), LLVMCreateObjectFile(), mergeAttributes(), mergeNamespaces(), printDwarfFileDirective(), llvm::BitcodeAnalyzer::printStats(), llvm::BitstreamCursor::ReadAbbrevRecord(), llvm::BitstreamCursor::readRecord(), readTriple(), llvm::SimpleBitstreamCursor::ReadVBR(), llvm::SimpleBitstreamCursor::ReadVBR64(), llvm::object::XCOFFObjectFile::relocations(), llvm::orc::OrcMCJITReplacement::setProcessAllSections(), llvm::BitstreamCursor::SkipBlock(), llvm::BitstreamCursor::skipRecord(), llvm::splitCodeGen(), llvm::object::SymbolicFile::SymbolicFile(), upgrade(), and llvm::MetadataLoader::MetadataLoaderImpl::upgradeDebugIntrinsics().

get() [2/2]

template<class T>

const_reference llvm::Expected< T >::get ( ) const

inline

Returns a const reference to the stored T value.

Definition at line 538 of file Error.h.

operator bool()

template<class T>

llvm::Expected< T >::operator bool ( )

inlineexplicit

Return false if there is an error.

Definition at line 524 of file Error.h.

operator*() [1/2]

template<class T>

reference llvm::Expected< T >::operator* ( )

inline

Returns a reference to the stored T value.

Definition at line 572 of file Error.h.

operator*() [2/2]

template<class T>

const_reference llvm::Expected< T >::operator* ( ) const

inline

Returns a const reference to the stored T value.

Definition at line 578 of file Error.h.

References assert(), llvm::dbgs(), LLVM_ATTRIBUTE_NOINLINE, LLVM_ATTRIBUTE_NORETURN, LLVM_UNLIKELY, llvm::ErrorInfoBase::log(), Other, and T1.

operator->() [1/2]

template<class T>

pointer llvm::Expected< T >::operator-> ( )

inline

Returns a pointer to the stored T value.

Definition at line 560 of file Error.h.

operator->() [2/2]

template<class T>

const_pointer llvm::Expected< T >::operator-> ( ) const

inline

Returns a const pointer to the stored T value.

Definition at line 566 of file Error.h.

operator=()

template<class T>

Expected& llvm::Expected< T >::operator= ( Expected< T > &&  Other )

inline

Move-assign from another Expected<T>.

Definition at line 509 of file Error.h.

References Other.

Referenced by llvm::MSVCPExpected< T >::operator=().

takeError()

template<class T>

Error llvm::Expected< T >::takeError ( )

inline

Take ownership of the stored error.

After calling this the Expected<T> is in an indeterminate state that can only be safely destructed. No further calls (beside the destructor) should be made on the Expected<T> value.

Definition at line 552 of file Error.h.

References llvm::Error, and llvm::Error::success().

Referenced by llvm::pdb::PDBFileBuilder::addInjectedSource(), llvm::pdb::PDBFileBuilder::addNamedStream(), llvm::BitstreamCursor::advance(), advanceToMetaBlock(), llvm::BitcodeAnalyzer::analyze(), llvm::object::ELFFile< ELFT >::android_relas(), llvm::lto::backend(), llvm::object::BindRebaseSegInfo::BindRebaseSegInfo(), llvm::cantFail(), llvm::FileCheckString::Check(), llvm::FileCheckString::CheckNot(), llvm::pdb::PDBFileBuilder::commit(), llvm::msf::MSFBuilder::commit(), computeMemberData(), llvm::RuntimeDyldImpl::computeTotalAllocSize(), llvm::orc::rpc::detail::ResultTraits< RetT >::consumeAbandoned(), llvm::object::SectionRef::containsSymbol(), copyAttributeNamespace(), llvm::object::MinidumpFile::create(), llvm::GlobPattern::create(), llvm::symbolize::SymbolizableObjectFile::create(), llvm::object::IRObjectFile::create(), llvm::lto::InputFile::create(), llvm::object::createBinary(), llvm::remarks::createBitstreamParserFromMeta(), llvm::LTOModule::createInputFile(), llvm::mca::InstrBuilder::createInstruction(), createOnDiskBuffer(), llvm::remarks::createYAMLParserFromMeta(), decode(), llvm::DWARFContext::defaultErrorHandler(), llvm::FileCheckPatternContext::defineCmdlineVariables(), llvm::dlltoolDriverMain(), doImportingForModule(), llvm::coverage::CounterMappingContext::dump(), llvm::object::ELFFile< ELFT >::dynamicEntries(), llvm::RuntimeDyldImpl::emitSection(), llvm::BitstreamCursor::EnterSubBlock(), llvm::coverage::CounterMappingContext::evaluate(), llvm::expectedToErrorOrAndEmitErrors(), llvm::RuntimeDyldELF::finalizeLoad(), llvm::RuntimeDyldCOFFX86_64::finalizeLoad(), llvm::pdb::GSIStreamBuilder::finalizeMsfLayout(), llvm::RuntimeDyldMachOX86_64::finalizeSection(), llvm::RuntimeDyldMachOI386::finalizeSection(), llvm::RuntimeDyldMachOAArch64::finalizeSection(), llvm::object::IRObjectFile::findBitcodeInMemBuffer(), llvm::object::IRObjectFile::findBitcodeInObject(), llvm::pdb::TpiStream::findFullDeclForForwardRef(), llvm::MCJIT::findSymbol(), llvm::pdb::SymbolCache::findSymbolByTypeIndex(), llvm::symbolize::LLVMSymbolizer::flush(), forceRenaming(), llvm::DWARFDebugAranges::generate(), llvm::MCJIT::generateCodeForModule(), llvm::object::MachOUniversalBinary::getArchiveForArch(), llvm::object::Archive::Child::getAsBinary(), llvm::object::COFFObjectFile::getAuxSymbol(), llvm::getBitcodeFileContents(), llvm::getBitcodeLTOInfo(), llvm::getBitcodeProducerString(), llvm::getBitcodeTargetTriple(), llvm::object::Archive::Child::getBuffer(), llvm::object::SectionRef::getContents(), getDbiStreamPtr(), llvm::pdb::DbiStream::getECName(), llvm::object::getELFAddend(), llvm::MemoryBuffer::getFileAsStream(), getFileAux(), llvm::object::Archive::Child::getFullName(), llvm::IndexedInstrProfReader::getFunctionCounts(), llvm::gsym::GsymReader::getFunctionInfo(), llvm::getLazyBitcodeModule(), llvm::DWARFContext::getLineTableForUnit(), llvm::object::MachOUniversalBinary::getMachOObjectForArch(), getMemoryBufferForStream(), llvm::object::Archive::Child::getMemoryBufferRef(), llvm::object::MinidumpFile::getMemoryInfoList(), llvm::getModuleSummaryIndex(), llvm::object::ArchiveMemberHeader::getName(), llvm::object::Archive::Child::getName(), llvm::object::Archive::Child::getNext(), llvm::getOffset(), llvm::NewArchiveMember::getOldMember(), getOpenFileImpl(), llvm::LTOModule::getProducerString(), llvm::object::Archive::Child::getRawSize(), getReadWriteFile(), llvm::FileCheckStringSubstitution::getResult(), llvm::FileCheckNumericSubstitution::getResult(), getSingleModule(), llvm::object::Archive::Child::getSize(), getSymbolInfo(), llvm::object::ELFObjectFile< ELFT >::getSymbolName(), llvm::object::XCOFFObjectFile::getSymbolSection(), llvm::object::XCOFFObjectFile::getSymbolSectionName(), llvm::object::MachOObjectFile::getSymbolType(), handleNonPrevailingComdat(), llvm::pdb::PDBFile::hasPDBInjectedSourceStream(), llvm::pdb::PDBFile::hasPDBStringTable(), llvm::isBitcodeContainingObjCCategory(), llvm::LTOModule::isBitcodeFile(), llvm::LTOModule::isBitcodeForTarget(), isBlock(), llvm::object::Decompressor::isCompressed(), llvm::object::ObjectFile::isSectionBitcode(), llvm::LTOModule::isThinLTO(), llvm::isThumbFunc(), jumpToValueSymbolTable(), llvm::jitlink::JITLinkerBase::linkPhase2(), LLVMCreateBinary(), LLVMCreateObjectFile(), LLVMGetSymbolAddress(), LLVMGetSymbolName(), LLVMMoveToContainingSection(), LLVMRemarkParserGetNext(), llvm::object::ResourceSectionRef::load(), llvm::xray::loadInstrumentationMap(), loadObj(), llvm::RuntimeDyldELF::loadObject(), llvm::xray::loadProfile(), llvm::xray::loadTraceFile(), llvm::lto::localCache(), lookupSection(), llvm::FileCheckPattern::match(), mergeAttributes(), mergeNamespaces(), llvm::remarks::YAMLRemarkParser::next(), llvm::object::MinidumpFile::MemoryInfoIterator::operator++(), llvm::parseBitcodeFile(), parseBitcodeFileImpl(), parseBlock(), llvm::remarks::BitstreamParserHelper::parseBlockInfoBlock(), parseHexOcta(), llvm::FileCheckPattern::parseNumericSubstitutionBlock(), parseRecord(), llvm::remarks::BitstreamRemarkParser::parseRemark(), llvm::remarks::YAMLRemarkParser::parseRemark(), parseV5DirFileTables(), pathHasTraversal(), popFront(), printDwarfFileDirective(), llvm::BitcodeAnalyzer::printStats(), llvm::FileCheckPattern::printSubstitutions(), llvm::object::ObjectFile::printSymbolName(), llvm::RuntimeDyldCOFFI386::processRelocationRef(), llvm::RuntimeDyldCOFFThumb::processRelocationRef(), llvm::RuntimeDyldELF::processRelocationRef(), llvm::RuntimeDyldCOFFX86_64::processRelocationRef(), llvm::BitstreamCursor::ReadAbbrevRecord(), llvm::object::readIRSymtab(), llvm::readModuleSummaryIndex(), llvm::BitstreamCursor::readRecord(), readTriple(), llvm::object::XCOFFObjectFile::relocations(), llvm::orc::RemoteObjectLayer< RPCEndpoint >::remoteToJITSymbol(), llvm::pdb::PDBFile::safelyCreateNamedStream(), llvm::orc::rpc::detail::RespondHelper< true >::sendResult(), llvm::orc::OrcMCJITReplacement::setProcessAllSections(), llvm::setupOptimizationRemarks(), llvm::BitstreamCursor::SkipBlock(), llvm::BitstreamCursor::skipRecord(), sumEdgeCount(), llvm::object::SymbolicFile::SymbolicFile(), llvm::symbolize::LLVMSymbolizer::symbolizeCode(), llvm::detail::TakeExpected(), llvm::lto::thinBackend(), upgrade(), llvm::MetadataLoader::MetadataLoaderImpl::upgradeDebugIntrinsics(), llvm::writeArchive(), and llvm::yaml::yaml2ObjectFile().

Friends And Related Function Documentation

Expected

template<class T>

template<class OtherT >

friend class Expected

friend

Definition at line 435 of file Error.h.

ExpectedAsOutParameter

template<class T>

template<class T1 >

friend class ExpectedAsOutParameter

friend

Definition at line 434 of file Error.h.

Member Data Documentation

ErrorStorage

template<class T>

AlignedCharArrayUnion<error_type> llvm::Expected< T >::ErrorStorage

Definition at line 677 of file Error.h.

TStorage

template<class T>

AlignedCharArrayUnion<storage_type> llvm::Expected< T >::TStorage

Definition at line 676 of file Error.h.

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The documentation for this class was generated from the following files:

• include/llvm/ObjectYAML/yaml2obj.h
• include/llvm/Support/Error.h