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5-1

Metaclass Framework Quick Reference

SOMObject

SOMClass

metaclass

SOMMBeforeAfter

metaclass

Class Organization

— The root class of all SOM metaclasses.

Defines the essential behavior (methods) common to all

SOM classes.

— Serves as the metaclass when defining a class whose

instances will call given methods before and after each

instance method.

SOMMSingleInstance

metaclass

— Serves as the metaclass when defining a class for which only

one instance can ever be created.

SOMMTraced

metaclass

— Serves as the metaclass when defining a class whose instances’

methods (inherited or introduced) when invoked print a message

giving the method parameters and unpon completion print the return

value.

SOMMBeforeAfter metaclass

(see sombacls.idl)

void sommAfterMethod (

in SOMObject object,

in somId methodID,

in void *returnedvalue,

in va_list ap);

Specifies a method that is automatically called after execution of each client method.

boolean sommBeforeMethod (

in SOMObject object,

in somId methodID,

in va_list ap);

Specifies a method that is automatically called before execution of each client method.

SOMMSingleInstance metaclass

(see snglicls.idl)

SOMObject sommGetSingleInstance ( );

Gets the one instance of a specified class for which only a single instance can exist.

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Bull DPX/20 Bedienungsanleitung Seite 47