Catching exceptions from a constructor means that my instance is out of scope afterward

Question

I have a class whose constructor may throw an exception. Here’s some code that will catch the exception:

try {
    MyClass instance(3, 4, 5);
}
catch (MyClas         


        

Answer 1

You should be doing everything you need to do inside the try block:

try {
    MyClass instance(3, 4, 5);

    // Use instance here
}
catch (MyClassException& ex) {
    cerr << "There was an error creating the MyClass." << endl;
    return 1;
}

After all, it is only within the try block that instance has been successfully created and so can be used.

I do wonder whether your catch block is really handling the exception. If you can't do anything to resolve the situation, you should be letting it propagate.