1. Object Slicing & Dynamic Casts

2. Object Slicing
Assigning subtype to parent type variable slices the object r1
Geometric Object
Rectangle

3. Object Slicing
Assigning subtype to parent type variable slices the object r1 r2
Geometric Object
Rectangle
Geometric Object

4. Pointers/References Pointers / References don't slice
Just store memory address, don't have to

5. Casting No cast required to store child address in parent ptr:
Virtual dispatch still finds child version of functions

6. Down Casting
Can't auto convert parent pointer back to child one:

7. BAD static_cast, BAD
static_cast happily pretends to turn a pointer into another pointer type…
…weird stuff may happen

8. Static vs Dynamic
Static : done at compile time Can this possibly make sense?
Dynamic : done at runtime Try to see if this works…

9. Dynamic Cast dynamic_cast<Type>( value )
Type must be a pointer or reference
At runtime:
Check to see if conversion makes sense
If so, do return pointer of Type
If not, return nullptr

10. GOOD dynamic_cast
dynamic_cast allows us to check if cast worked:

11. GOOD dynamic_cast dynamic_cast allows us to check if cast worked:
Up to you to check!