Exceptions in constructor and destructor in C ++

1. Exceptions in the constructor

You can throw an exception in the constructor. When a constructor throws an exception, it indicates that an object is not fully constructed by the constructor, so the Destructor is not called. At this time, only automatic variables are released, and resources that are dynamically allocated cannot be automatically released. In this case, you can use smart pointers to manage dynamically allocated resources.

2. Exceptions in destructor

Although exceptions can be thrown in the destructor, do not throw exceptions in the destructor. The reason is that when the Destructor throws an exception, if there is another exception that has not been processed, the system will call the terminate function. Therefore, if the Destructor has a try module, place all statements that may encounter exceptions in the try module. When an exception is caught, do not throw an exception in the catch, but swallowed up the exception.