Self Assesment Questions 9

Instructions

For each question choose the single response which best answers the question, or which completes the statement most accurately.

Question 82: What is a "const member function"?

One which always returns the same value

One which always returns the same values, given the same arguments (i.e. a "mathematical function)

One which takes only const (or const reference) parameters

One which is safe to call on a const object

One which is safe to call from const object's function members

Question 83: Why are such member functions necessary?

They ensure that constants don't change during execution

They ensure that member functions don't change during execution

They ensure that the data of an object doesn't change during execution

They ensure that the type of an object doesn't change during execution

None of the above

Question 84: What constraints does the compiler put on a const member function?

It cannot be overloaded, or declared virtual

It cannot change any mutable data member of the object on which it is called

It cannot change any non-mutable data member of the object on which it is called

It cannot call any other non-const member function of the object on which it is called

It cannot change any non-mutable data member, nor call any other non-const member function, of the object on which it is called

Question 85: What is a "mutable data member"

A mutable data member is one whose value can change (i.e. not a const)

A mutable data member is one whose value can be changed by a const member function

A mutable data member is one whose type can change during execution

A mutable data member is one whose size can change (i.e. a dynamically-allocated array)

A mutable data member is one which can be optimized away by the compiler

You should also review Topic 2 questions on typing and inheritance.

Last updated: August 11, 2005