The QException class provides a base class for exceptions that can be transferred across threads. More...
| Header: | #include <QException> |
| CMake: | find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core) |
| qmake: | QT += core |
| Since: | Qt 5.0 |
| Inherited By: |
Qt Concurrent supports throwing and catching exceptions across thread boundaries, provided that the exception inherits from QException and implements two helper functions:
class MyException : public QException { public: void raise() const override { throw *this; } MyException *clone() const override { return new MyException(*this); } };
QException subclasses must be thrown by value and caught by reference:
try { QtConcurrent::blockingMap(list, throwFunction); // throwFunction throws MyException } catch (MyException &e) { // handle exception }
If you throw an exception that is not a subclass of QException, the Qt Concurrent functions will throw a QUnhandledException in the receiver thread.
When using QFuture, transferred exceptions will be thrown when calling the following functions:
[virtual] QException *QException::clone() constIn your QException subclass, reimplement clone() like this:
MyException *MyException::clone() const { return new MyException(*this); }
[virtual] void QException::raise() constIn your QException subclass, reimplement raise() like this:
void MyException::raise() const { throw *this; }
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