Object-Oriented Light¶

The runtime has a minimal OOP-lite layer: create a named class, instantiate it with New, and store attributes on the instance.

#include "abscom/abs.h"

API¶

Function	Description
`var Class(const char *name)`	A new class object with the given name.
`var New(var cls)`	A new instance of the class.
`void set_attr(var obj, const char *key, var val)`	Store an attribute (C-string key).
`var get_attr(var obj, const char *key)`	Read an attribute; `None` if missing.

Class objects and instances are both var values; instances remember their class.

Example¶

abs_init();

var Point = Class("Point");

var p = New(Point);
set_attr(p, "x", v(3));
set_attr(p, "y", v(4));

print(get_attr(p, "x"));      /* 3   */
print(get_attr(p, "y"));      /* 4   */
print(p);                     /* <Point object> */
print(Point);                 /* <class 'Point'> */

Reading missing attributes¶

get_attr on a key that was never set returns None:

var p = New(Class("C"));
get_attr(p, "missing");       /* None */

Notes¶

Attributes live on the instance, keyed by C-string keys.
Instances work with the normal value rules — store them in lists, dicts, and sets.
set_attr/get_attr on a non-instance are a no-op / None, respectively.

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