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- 4D Language Reference
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- Objects (Language)
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Structure of 4D language objects
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Using object notation
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Shared objects and shared collections
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New object
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New shared object
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OB Class
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OB Copy
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OB Entries
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OB Get
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OB GET ARRAY
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OB GET PROPERTY NAMES
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OB Get type
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OB Instance of
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OB Is defined
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OB Is empty
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OB Is shared
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OB Keys
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OB REMOVE
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OB SET
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OB SET ARRAY
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OB SET NULL
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OB Values
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Storage
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OB Class
| OB Class ( object ) -> Function result | ||||||||
| Parameter | Type | Description | ||||||
| object | Object |
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Object whose class is to be returned | |||||
| Function result | Object, Null |
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Class of object | |||||
The OB Class command returns the class of the object passed in parameter. In 4D, all objects inherit from the Object class. If object is not an existing object, OB Class returns null.
You created the Polygon class:
//Class: Polygon
Class constructor
C_LONGINT($1;$2)
This.area:=$1*$2Then, in a method, you can write:
C_OBJECT($poly;$class)
$poly:=cs.Polygon.new(4;3)
$class:=OB Class($poly)
//$class contains Class: Polygon
Product: 4D
Theme: Objects (Language)
Number:
1730
Created: 4D v18 R3
4D Language Reference ( 4D v20)
4D Language Reference ( 4D v20.1)
4D Language Reference ( 4D v20.2)
4D Language Reference ( 4D v20.3)
4D Language Reference ( 4D v20.4)
4D Language Reference ( 4D v20.5)
4D Language Reference ( 4D v20.6)
