17.5.1.1 Example

Consider the following example, where a closure is defined:

(let ((test-button (make-instance 'capi:button)))

  (defun is-button-enabled ()

    (capi:button-enabled test-button)))

This has defined the function is-button-enabled , which is a closure over the variable test-button , where the value of test-button is an instance of the capi:button class.

1. Enter the definition of the closure shown above into a Listener.
2. Choose Values > Inspect .

The Inspector examines the symbol is-button-enabled .

3. Click on the FUNCTION slot to select the closure.
4. Choose Slots > Inspect to inspect the value in the selected slot.

The closure is inspected.

LispWorks IDE User Guide (Macintosh version) - 25 Nov 2011