ITT Rule IDL Version 7.0 User Manual download pdf (Page 171)

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Chapter 7: Creating an Operation 171

iTool Developer’s Guide Creating a New Generalized Operation

keyword values to be handled explicitly in the Init method, but we do use the

keyword inheritance mechanism to pass keyword values through to methods called

within the Init method. The

ExampleOp Init method does the following things:

1. Calls the Init method of the superclass, IDLitOperation. We use the TYPES

keyword to specify that our operation works on data that has the iTool data

type

'IDLARRAY2D', provide a Name for the object instance, and provide an

icon. Finally, we use the _EXTRA keyword inheritance mechanism to pass

through any keywords provided when the

ExampleOp Init method is called.

2. Returns the integer 1, indicating successful initialization.

Creating a Cleanup Method

The operation class Cleanup method handles any cleanup required by the operation

object, and should do the following:

• destroy any pointers or objects created by the operation

• call the superclass’ Cleanup method

Calling the superclass’ cleanup method will destroy any objects created when the

superclass was initialized.

Note

If your operation class is based on the IDLitOperation class, and does not create any

pointers or objects of its own, the Cleanup method is not strictly required. It is

always safest, however, to create a Cleanup method that calls the superclass’

Cleanup method.

See “IDLitOperation::Cleanup” (IDL Reference Guide) for additional details.

Example Cleanup Method

The following example code shows a very simple Cleanup method for the

ExampleOp operation:

PRO ExampleOp::Cleanup

; Clean up superclass

self->IDLitOperation::Cleanup

END

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