Objects with Functions and Arrays

Objects can be Passed Class defines type – Can use as type of function or parameter

Returning an Object To return object: – Make desired object – Return it Use function:

Passing An Object Passing object copies the object: Main: c1 radius: 5

Passing An Object Passing object copies the object: Main: c1 radius: 5 c

Copies Generally Bad Copies – Are inefficient – Prevent functions from modifying an object Main: c1 radius: 5

Copies Generally Bad Copies – Are inefficient – Prevent functions from modifying an object Main: c1 radius: 5 c

Copies Generally Bad Copies – Are inefficient – Prevent functions from modifying an object Main: c1 radius: 5 c radius: 10

Copies Generally Bad Copies – Are inefficient – Prevent functions from modifying an object Main: c1 radius: 5

Pass By Reference Unless you need copy, pass by reference Main: c1 radius: 5

Pass By Reference Unless you need copy, pass by reference Main: c1 radius: 5 c

Pass By Reference Unless you need copy, pass by reference Main: c1 radius: 10 c

Pass By Reference Unless you need copy, pass by reference Main: c1 radius: 10

Const Reference To prevent function from modifying, use const reference: Link back to original object Make changing it a compile error

Arrays Can have an array of objects CircleList 0 radius:

Arrays Reference individual objects by index CircleList 0 radius: 4 1 radius:

Arrays Arrays initialized with default constructor CircleList 0 radius:

Arrays This makes 10 circles:

Arrays This makes 10 circles: CircleList 0 radius:

Arrays This makes 10 circles: CircleList 0 radius: 1 1 radius: 2 2 radius: 3 3 radius: 4 4 radius: 5

Arrays Use initialization list to prevent filling with default objects: CircleList 0 radius: 1 1 radius: 2 2 radius: 3 3 radius: 4 4 radius: 5 Call 1-arg constructor to make anonymous object