Exception Class Reference

The Exception class. More...

#include <exceptions.h>

Inheritance diagram for Exception:

Collaboration diagram for Exception:

Public Member Functions
	Exception ()=delete
	The default constructor.
	Exception (const Exception &other) noexcept
	The copy constructor (needed for clone())
	Exception (const char *file, int line, const QString &msg=QString("Exception")) noexcept
	The constructor which is used to throw an exception.
virtual	~Exception () noexcept
	The destructor.
const QString &	getMsg () const
	Get the error message (translated)
const QString &	getFile () const
	Get the source file where the exception was thrown.
int	getLine () const
	Get the line number where the exception was thrown.
const char *	what () const noexcept override
	reimplemented from std::exception::what()
virtual void	raise () const override
virtual Exception *	clone () const override

Private Attributes
QString	mMsg
	the error message (translated)
QString	mFile
	the source filename where the exception was thrown
int	mLine
	the line number where the exception was thrown
QByteArray	mMsgUtf8
	the message as an UTF8 byte array

Detailed Description

The Exception class.

This is an exception base class. It inherits from the QException class, which implements an exception class which can be transferred across threads. QException inherits from std::exception. There are several subclasses of the class Exception, see inheritance diagram.

Note

Exceptions must always be thrown by value and caught by (const) reference!

For more information about the QException class read the Qt documentation.

Each Exception object holds following attributes:

• a message (mMsg): error message in the user's language (can be printed directly to a QMessageBox or similar)
• the filename of the source file where the exception was thrown (mFile)
• the line number where the exception was thrown (mLine)

Note

Every exception will automatically print a debug message (see librepcb::Debug) of type librepcb::Debug::DebugLevel_t::Exception.

Example how to use exceptions:

void foo(int i) {
  if (i < 0) {
    throw Exception(__FILE__, __LINE__, tr("Invalid argument: %1").arg(i));
  }
}
 
void bar() noexcept {
  try {
    foo(-5);
  } catch (const Exception& e) {
    QMessageBox::critical(0, tr("Error"), e.getMsg());
  }
}

Warning

Please read the "Exception Safety" notes from the Qt Project documentation before writing source code which throws exceptions, there are some important things to know: http://qt-project.org/doc/qt-5/exceptionsafety.html

Constructor & Destructor Documentation

Exception() [1/3]

Exception ( )

delete

The default constructor.

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Exception() [2/3]

Exception ( const Exception &  other )

noexcept

The copy constructor (needed for clone())

Exception() [3/3]

Exception ( const char *  file, int  line, const QString &  msg = QString("Exception")  )

noexcept

The constructor which is used to throw an exception.

Parameters

file	The source file where the exception was thrown (use FILE)
line	The line number where the exception was thrown (use LINE)
msg	An error message in the user's language (use QObject::tr()). This message can be used in message boxes.

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~Exception()

virtual ~Exception ( )

inlinevirtualnoexcept

The destructor.

Member Function Documentation

getMsg()

const QString & getMsg ( ) const

inline

Get the error message (translated)

Returns

The error message in the user's language

getFile()

const QString & getFile ( ) const

inline

Get the source file where the exception was thrown.

Returns

The filename

getLine()

int getLine ( ) const

inline

Get the line number where the exception was thrown.

Returns

The line number

what()

const char * what ( ) const

overridenoexcept

reimplemented from std::exception::what()

Warning

This method is only for compatibility reasons with the base class std::exception. Normally, you should not use this method. Use getMsg() instead.

Note

The returned pointer is valid as long as the exception object exists

Returns

the error message as a C-string (const char*) in the local encoding

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raise()

virtual void raise ( ) const

inlineoverridevirtual

Reimplemented in LogicError, RuntimeError, RangeError, FileParseError, and UserCanceled.

clone()

virtual Exception * clone ( ) const

inlineoverridevirtual

Reimplemented in LogicError, RuntimeError, RangeError, FileParseError, and UserCanceled.

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Member Data Documentation

mMsg

QString mMsg

private

the error message (translated)

mFile

QString mFile

private

the source filename where the exception was thrown

mLine

int mLine

private

the line number where the exception was thrown

mMsgUtf8

QByteArray mMsgUtf8

mutableprivate

the message as an UTF8 byte array

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

• /__w/1/s/libs/librepcb/core/exceptions.h
• /__w/1/s/libs/librepcb/core/exceptions.cpp