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: Use function: 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: c radius: 5

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

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

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

Copies Generally Bad Copies Main: 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: c c1 radius: 5

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

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 radius: 2 1 2 3 4

Arrays Reference individual objects by index CircleList radius: 4 radius: 4 1 radius: 2 2 3 4

Arrays Arrays initialized with default constructor CircleList radius: 2 1 2 3 4

Arrays This makes 10 circles:

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

Arrays This makes 10 circles: CircleList radius: 1 radius: 2 1 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 radius: 1 1 radius: 2 2 radius: 3 3 radius: 4 4 radius: 5 Call 1-arg constructor to make anonymous object