Zero initialization. Copy initialization. Direct initialization. Aggregate initialization. Constant initialization. Reference initialization. Value categories. Order of evaluation. Operator precedence. Alternative representations. Boolean - Integer - Floating-point.
Implicit conversions - Explicit conversions. Class declaration. Access specifiers. Virtual function. Default constructor. Copy constructor. Copy assignment. Class template. Function template.
Template specialization. Data members. The this pointer. Nested classes. The map inside? What map? May 16, at am UTC. No, I meant the order you would have thought initially. Anmol wrote: What map? I meant "container", the one we've been talking about.
True I would have thought of it like that initially. I guess, so there isn't much of a reason behind it? Its just so less confusion is found?
There is a massive important reason behind it, please read cire's post. In this "If the base class portion of a derived class were destroyed before the derived class version, the class instance would be in an undefined state. And how would it be in undefined state? I know alot of my questions are stupid, I aint a very smart person If data members are not initialized then program may give unexpected results.
Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern. Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.
Making an interface final. If you make a method final you cannot override it and, if you make a variable final you cannot modify it. If you make an interface final, you cannot implement its methods which defies the very purpose of the interfaces.
Therefore, you cannot make an interface final in Java. No, we cannot override private or static methods in Java. The destructors execute in reverse order for a similar reason: if the base destructor were to execute first then the derived destructor could access resources from the base class that are no longer available freed memory, closed files etc.
Consider something as simple as a class which has a name member and a derived class which uses that name to do some logging I'll just use cerr for this purpose :. If the destructor of the base class A runs first then the 'name' object will be destroyed, its buffer will be freed. When the destructor of the derived class B runs it will try to use the string and it will crash or print garbage because the string object has already been destroyed.
If the derived destructor runs first then it's all fine, the 'name' object is still valid and it will be destroyed only after the derived constructor completes. It's also worth noting that the base class doesn't have access to the derived class data members so it doesn't care if the derived destructor has been called.
0コメント