Operator Assignment

Operator Assignment-60
In other words, both objects will behave the same way and return the same results when their methods are called.

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Unfortunately, we would have rated almost all of them somewhere between a 4 and a 6.

In my opinion, this goes to show you that working with C for a long time doesn't guarantee you really understand the language.

However, it may not be necessary to define it since once again, the compiler will generate a definition for the (copy) assignment operator.

But as it is with the compiler generated copy constructor, it will be a shallow copy: every member of the class is copied from the source to the target without consideration to pointer problems.

As a public service, I'd like to share my stock question and its answer with you and explore the various programming issues it presents.

The question is as follows: This seems like a simple enough exercise, but it gets at some interesting issues.Always give any new class a default constructor, a copy constructor, and an assignment operator.Another misconception I see often is a fuzzy idea of the difference between the copy constructor and the assignment operator.These three functions are special in C : If you don't provide them yourself, C provides them for you. Among other things, this means you have to define these operations even if you don't want a client to be able to copy or default-construct a particular class.If you don't want a class to be copied, for example, you have to define an empty copy constructor and assignment operator yourself and make them private or protected.It's a good way to test a programmer's grasp of C syntax and C style, but more importantly, it tests the programmer's knowledge of C memory management and exception handling. We'll go through it all piece by piece and see why this is.For the impatient among you, let's cut right to the chase: One correct answer to this question would look something like this: Yes, it's a lot of code. The first reaction I usually get from people is something along the lines of "But I never have to write assignment operators." You should. There are those that simply cannot be overloaded, and then there are those that must be overloaded as member functions of the class; they cannot be nonmember functions. The assignment operator can be defined to assign any type to an object of your user-defined type.But we most often think of this operator as assigning an object of some type to an object of the same type. Copy assignment is very important to define correctly.If your class has no pointer members, then the shallow copy works just fine. Fraction& Fraction::operator = (const Fraction & source) By returning a reference to the calling object, you are able to chain the assignment Fraction f, g, h;f = g = h; // h assigned to g, which is assigned to f The order of evaluation of assignment operators is right to left. For a dict, if the location designated by the left-hand operand is a non-existent array element, a new element is inserted with the designated key and with a value being that of the right-hand operand.


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