Sometimes, we are required to dynamically allocate memory and construct a class in that memory. That's where the troubles start. Take a look at the following code:

bool foo1() { 
    foo_class* p = new foo_class("Some data"); 

    const bool something_else_happened = some_function1(*p);  
    if (something_else_happened) { 
        delete p; 
        return false; 
    } 
 
    some_function2(p); 
 
    delete p; 
    return true; 
}

This code looks correct at first glance. But, what if some_function1() or some_function2() throws an exception? In that case, p won't be deleted. Let's fix it in the following way:

bool foo2() { 
    foo_class* p = new foo_class("Some data"); 
    try { 
        const bool something_else_happened = some_function1(*p); 
        if (something_else_happened) { 
            delete...