The document describes Pure Data's object-oriented programming model, where all elements like boxes, objects, classes and inlets/outlets are represented as objects, with classes defining common behaviors and properties of objects, and objects being instances of classes that can receive and send messages through inlets and outlets. Key elements include the class struct that defines methods like initialization and message handling, the t_object base class, and fundamental data types like symbols, atoms, and inlet/outlet objects that allow communication between objects.

1. Pure Data
Object Model
@PdKai #2
id:nagachika

2. Pd Object Model
GUI
box object
object class
object
object inlet/outlet
…

3. Pd Object Model
Class GUI
Class
object object object
object
Class
object inlet/outlet object
( object )

4. Pd Object Model
class (m_imp.h struct _class )
(object box )
( )
initialize (newmethod) object
( )
bang, float, symbol, list, pointer...
← inlet
etc etc...

5. Object
t_object
(getbytes/freebytes)
destructor
typedef struct myobj {
t_object
t_object base; // GUI
....
} t_myobj;

6. symbol
•
•
(gensym (m_class.c) char * → t_symbol * )
• &
HashTable
(symhash)
s_next
0 “hoge” “foo”
1 “bar”
t_symbol
2 (m_pd.h)
typedef struct _symbol {
3 char *s_name;
struct _class **s_thing;
struct _symbol *s_next;
} t_symbol;

7. t_atom
• float, symbol, list, pointer etc...
object inlet/outlet
• enum (union)
(m_pd.h t_atom)
• class inlet