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17.5.1.1 Example

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 Works > Values > Inspect .

    3. The Inspector examines the symbol is-button-enabled .

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

The closure is inspected.

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

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