Operator Assignment

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.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.Over this time, I've developed a stock interview question that's proven to be a pretty good gauge of C knowledge.No one has yet been able to just rip out the correct answer, but we've had several, including the guy we hired, who understood the important issues and were able to get the question right with prompting.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.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.In other words, both objects will behave the same way and return the same results when their methods are called.If they have public data members (generally a bad idea), they have the same values.


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