Classes

Classes

Classes are types that specify an inheritance relationship and can have associated structured data through properties.

<class>	(<type>)	C
class-name	(x|<class> => (t? <sym>))	G
	returns class name or false otherwise.
class-parents	(x|<class> => <seq>)	G
	direct superclasses.
class-ancestors	(x|<class> => <seq>)	G
	class precedence list including this class. See Appendix * for details.
class-direct-props	(x|<class> => <seq>)	G
	properties defined directly on this class.
class-props	(x|<class> => <seq>)	G
	properties defined on this class or any superclass.
class-children	(x|<class> => <seq>)	G
	direct subclasses.
DC	(DC ,name (,@parents))	S
	defines a class named ,name with direct parents ,@parents
new	(type|<class> prop-inits|...)	M
	creates an instance of type type and prop initialized as specified by prop-inits. For example, (new <point> point-x 1 point-y 2) creates a point with x=1 and y=2.

Properties

Properties are named data associated with classes. Their values are accessed exclusively through generic functions, called getters and setters. Descriptions of properties are instances of <prop>. Property values can either be specified at creation time with keyword arguments, by calling a property setter, or through a property initialization function called lazily the first time a getter is called if the property is otherwise uninitialized. Property initialization functions are called with a single argument, the object under construction.

<prop>	(<any>)	C
prop-owner	(x|<prop> => <any>)	P
	class on which property was directly defined.
prop-getter	(x|<prop> => <gen>)	P
	reader accessor generic.
prop-setter	(x|<prop> => <gen>)	P
	writer accessor generic.
prop-type	(x|<prop> => <type>)	P
	type constraining property value.
prop-init	(x|<prop> => <fun>)	P
	lazy initialization function.
find-getter	(c|<class> getter|<gen> => <met>)	G
	finds getter method defined on given class.
find-setter	(c|<class> setter|<gen> => <met>)	G
	finds setter method defined on given class.
prop-bound?	(x g|<gen> => <log>)	P
	returns true if property with getter g is bound in instance x.
add-prop	(owner getter|<gen> setter|<gen> type|<type> init|<fun>)	M
	where init is a one parameter function that returns the initial value for the prop and gets called lazily with the new instance as the argument.
DP	(DP ,name (,oname|,owner => ,type) [,@init])	S
	add's a property to ,owner with getter named ,name, setter named ,name ## "-setter", type ,type, and optionally initial value ,init. The initial value function is evaluated lazily when prop's value is first requested.

Classes