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

A variant of Remy's answer, but saving a dynamic allocation using std::optional:

std::optional instance_opt;
try {
    // could use `instance = MyClass(3, 4, 5)`, but that requires you to write a move constructor
    instance_opt.emplace(3, 4, 5);
}
catch (const MyClassException& ex) {
    std::cerr << "There was an error creating the MyClass." << std::endl;
    return 1;
}
MyClass& instance = *instance_opt;
// use instance as needed...