QUnhandledException Class | Qt Core 6.4.1

- Qt 6.4
- Qt Core
- C++ Classes
- QUnhandledException
- Qt 6.4.1 Reference Documentation

# QUnhandledException Class

The QUnhandledException class represents an unhandled exception in a Qt Concurrent worker thread. More...

Header: | #include <QUnhandledException>
CMake: | find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake: | QT += core
Since: | Qt 5.0
Inherits: | QException

- List of all members, including inherited members

## Public Functions

| QUnhandledException(const QUnhandledException &other)
| QUnhandledException(QUnhandledException &&other)
| QUnhandledException(int exception = ...)
QUnhandledException & | operator=(const QUnhandledException &other)
int | exception() const
void | swap(QUnhandledException &other)

## Detailed Description

If a worker thread throws an exception that is not a subclass of QException, the Qt Concurrent functions will throw a QUnhandledException on the receiver thread side. The information about the actual exception that has been thrown will be saved in the QUnhandledException class and can be obtained using the exception() method. For example, you can process the exception held by QUnhandledException in the following way:

     try {
         auto f = QtConcurrent::run([] { throw MyException {}; });
         // ...
     } catch (const QUnhandledException &e) {
         try {
             if (e.exception())
                 std::rethrow_exception(e.exception());
         } catch (const MyException &ex) {
             // Process 'ex'
         }
     }

Inheriting from this class is not supported.

## Member Function Documentation

### QUnhandledException::QUnhandledException(const QUnhandledException &other)

Constructs a QUnhandledException object as a copy of other.

### QUnhandledException::QUnhandledException(QUnhandledException &&other)

Move-constructs a QUnhandledException, making it point to the same object as other was pointing to.

### `[since 6.0]` QUnhandledException::QUnhandledException(int exception = ...)

Constructs a new QUnhandledException object. Saves the pointer to the actual exception object if exception is passed.

This function was introduced in Qt 6.0.

See also exception().

### QUnhandledException &QUnhandledException::operator=(const QUnhandledException &other)

Assigns other to this QUnhandledException object and returns a reference to this QUnhandledException object.

### `[since 6.0]` int QUnhandledException::exception() const

Returns a pointer to the actual exception that has been saved in this QUnhandledException. Returns a `null` pointer, if it does not point to an exception object.

This function was introduced in Qt 6.0.

### `[since 6.0]` void QUnhandledException::swap(QUnhandledException &other)

Swaps this QUnhandledException with other. This function is very fast and never fails.

This function was introduced in Qt 6.0.