QScopedValueRollback

The QScopedValueRollback class resets a variable to its previous value on destruction. More...

 #include <QScopedValueRollback>

This class was introduced in Qt 4.8.

Public Functions

QScopedValueRollback ( T & var )
~QScopedValueRollback ()
void commit ()

Detailed Description

The QScopedValueRollback class resets a variable to its previous value on destruction.

The QScopedAssignment class can be used to revert state when an exception is thrown without needing to write try-catch blocks.

It can also be used to manage variables that are temporarily set, such as reentrancy guards. By using this class, the variable will be reset whether the function is exited normally, exited early by a return statement, or exited by an exception.

The template can only be instantiated with a type that supports assignment.

See also QScopedPointer.

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