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usesLayout()

Used inside a controller's config() function to specify which layout template should be applied to the controller or specific actions. You can define a default layout for the entire controller, specify layouts only for certain actions, exclude specific actions from using a layout, or even provide a custom function to determine which layout to use dynamically. This allows fine-grained control over your page structure and helps maintain consistent design while accommodating exceptions.

Name	Type	Required	Default	Description
template	string	Yes		Name of the layout template or function name you want to use.
ajax	string	No		Name of the layout template you want to use for AJAX requests.
except	string	No		List of actions that should not get the layout.
only	string	No		List of actions that should only get the layout.
useDefault	boolean	No	true	When specifying conditions or a function, pass in `true` to use the default `layout.cfm` if none of the conditions are met.

1. We want this layout to be used as the default throughout the entire controller, except for the `myAjax` action. 
usesLayout(template="myLayout", except="myAjax"); 

2. Use a custom layout for these actions but use the default `layout.cfm` for the rest. 
usesLayout(template="myLayout", only="termsOfService,shippingPolicy"); 

3. Define a custom function to decide which layout to display.
// The `setLayout` function should return the name of the layout to use or `true` to use the default one. 
usesLayout("setLayout");