llvm::StringError Class Reference

This class wraps a string in an Error. More...

#include "llvm/Support/Error.h"

Inheritance diagram for llvm::StringError:

Public Member Functions
	StringError (std::string &&S, std::error_code EC, bool PrintMsgOnly)
	StringError (std::error_code EC, const Twine &S=Twine())
	Prints EC + S and converts to EC.
	StringError (const Twine &S, std::error_code EC)
	Prints S and converts to EC.
void	log (raw_ostream &OS) const override
	Print an error message to an output stream.
std::error_code	convertToErrorCode () const override
	Convert this error to a std::error_code.
const std::string &	getMessage () const
Public Member Functions inherited from llvm::ErrorInfo< StringError >
const void *	dynamicClassID () const override
bool	isA (const void *const ClassID) const override
Public Member Functions inherited from llvm::ErrorInfoBase
virtual	~ErrorInfoBase ()=default
virtual void	log (raw_ostream &OS) const =0
	Print an error message to an output stream.
virtual std::string	message () const
	Return the error message as a string.
virtual std::error_code	convertToErrorCode () const =0
	Convert this error to a std::error_code.
virtual const void *	dynamicClassID () const =0
virtual bool	isA (const void *const ClassID) const
template<typename ErrorInfoT >
bool	isA () const

Static Public Attributes
static char	ID = 0

Additional Inherited Members
Static Public Member Functions inherited from llvm::ErrorInfo< StringError >
static const void *	classID ()
Static Public Member Functions inherited from llvm::ErrorInfoBase
static const void *	classID ()

Detailed Description

This class wraps a string in an Error.

StringError is useful in cases where the client is not expected to be able to consume the specific error message programmatically (for example, if the error message is to be presented to the user).

StringError can also be used when additional information is to be printed along with a error_code message. Depending on the constructor called, this class can either display:

1. the error_code message (ECError behavior)
2. a string
3. the error_code message and a string

These behaviors are useful when subtyping is required; for example, when a specific library needs an explicit error type. In the example below, PDBError is derived from StringError:

Expected<int> foo() {
   return llvm::make_error<PDBError>(pdb_error_code::dia_failed_loading,
                                     "Additional information");
}

Definition at line 1268 of file Error.h.

Constructor & Destructor Documentation

StringError() [1/3]

llvm::StringError::StringError	(	std::string &&	S,
		std::error_code	EC,
		bool	PrintMsgOnly
	)

Definition at line 146 of file Error.cpp.

StringError() [2/3]

llvm::StringError::StringError	(	std::error_code	EC,
		const Twine &	S = Twine()
	)

Prints EC + S and converts to EC.

Definition at line 140 of file Error.cpp.

StringError() [3/3]

llvm::StringError::StringError	(	const Twine &	S,
		std::error_code	EC
	)

Prints S and converts to EC.

Definition at line 143 of file Error.cpp.

Member Function Documentation

convertToErrorCode()

std::error_code llvm::StringError::convertToErrorCode ( ) const

overridevirtual

Convert this error to a std::error_code.

This is a temporary crutch to enable interaction with code still using std::error_code. It will be removed in the future.

Implements llvm::ErrorInfoBase.

Definition at line 159 of file Error.cpp.

Referenced by llvm::msf::MSFError::isPageOverflow().

getMessage()

const std::string & llvm::StringError::getMessage ( ) const

inline

Definition at line 1281 of file Error.h.

log()

void llvm::StringError::log ( raw_ostream &  OS ) const

overridevirtual

Print an error message to an output stream.

Implements llvm::ErrorInfoBase.

Definition at line 149 of file Error.cpp.

Member Data Documentation

ID

char llvm::StringError::ID = 0

static

Definition at line 1270 of file Error.h.

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

• include/llvm/Support/Error.h
• lib/Testing/Support/Error.cpp