Class 2: Functions

1
Class 2 Functions
2
Next week

• For Sept 27
• Page 102, 3.10.2 (1) Playing cards
• Page 103, 3.10.3(1) Employee Class

3
Function prototype

• What the skeleton
• Why (type) safe computing
• When always (even when not required)
• Where at top of .cpp file
• Note .h (header) file takes care of this for a
  class

4
const

• Only with
• What would void func(const int aVar) mean?
• A function may be const
• Never return a non-const reference to private
  dataprivData func(int aVar)

5
this

• Pointer (address) of current object
• Only permitted in member function
• obj Objecho(Obj anObj) return this
• dereferences this
• and are inverses of each other

6
friend

• friend classes get access to private information
• You get to decide who your friends are
• class ClassA friend ClassB
• Friendship is not transitive. (A friend of a
  friend is not a friend.)

7
Overloading

• Different functions, same name
• Must have different signatures (Note Type
  difference is not enough)
• Use common sense overloaded names should do
  similar things!
• Often overload constructors