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OOP Overview

Table 1. How different kinds of objects may be represented
Combinations

Property

1

2

3

4

5

6

7

8

9

10

11

12

State

None

✔

✔

✔

Immutable

✔

✔

✔

Mutable

✔

✔

✔

✔

✔

✔

Polymorphism

None

✔

✔

✔

✔

✔

Closed

✔

✔

✔

✔

✔

Open

✔

✔

✔

✔

✔

Sharing

Single referrer

✓

✓

✓

✓

✓

✓

✔

✔

Multiple referrers

✓

✓

✓

✓

✓

✓

✔

✔

Shared between threads

✓

✓

✓

✓

✓

✓

✔

✔

Representable by…​

1

2

3

4

5

6

7

8

9

10

11

12

Term

✔

✔

✔

✔

✔

Function object

✔

✔

VTable

✔

✔

(VTable,State) pair

✔

ETS table

✔

✔

✔

✔

Process

✔

✔

✔
Table 2. Comments
Nr. Comment

1

Has neither value nor behaviour. There are two cases:

  • A unique reference, if object identity is used.

  • A dummy constant, otherwise.

2

Atom naming the type

3

Behaviour without state

4

Classic monomorphic value object

5

Records

6

Behaviour with fixed state

7

Threaded value

8

Threaded value with vtable

9

Mutable objects kept in an ETS table

10

Mutable (VTable,State) pairs kept in an ETS table

11

Non-private ETS table, or state kept by a process

12

Non-private ETS table, or state kept by a process