CLASSDATA
Define a CLASSDATA variable for a class (NOT for an Object!)
- Syntax
-
- CLASSDATA <DataName1> [,<DataNameN>] [ AS <type> ] [ INIT <uValue> ]
- Arguments
-
- <DataName1> Name of the DATA
- <type> Optional data type specification from the following: Character, Numeric, Date, Logical, Codeblock, Nil
- <uValue> Optional initial value at program startup
- Description
-
- CLASSDATA variables can also be thought of as the "properties" of an entire class. Each CLASSDATA exists only once, no matter how many objects are created. A common usage is for a counter that is incremented whenever an object is created and decremented when one is destroyed, thus monitoring the number of objects in existance for this class.
- You can use the "AS <type>" clause to enforce that the CLASSDATA is maintained as a certain type. Otherwise it will take on the type of whatever value is first assigned to it. Use the "INIT <uValue>" clause to initialize that DATA to <uValue> whenever the class is first used.
Examples
CLASS TWindow
DATA hWnd, nOldProc
CLASSDATA lRegistered AS LOGICAL
ENDCLASS
- Status
- Ready
- Compliance
-
- CLASSDATA is a Harbour extension.
- Platforms
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- All
- See Also