[[Property:title|Set-procedure]]
[[Property:weight|10]]
[[Property:uuid|46b84038-099b-070c-15d7-2b7884a50e01]]
When creating an attribute, it is common that you will also need a set-procedure for it. For example, for attribute <eiffel>property</eiffel> you need a procedure <eiffel>set_property</eiffel> to set it. This feature takes one argument of the same type as <eiffel>property</eiffel> or is anchored to it. The only thing you have to do with the feature wizard is check the button '''Generate set procedure'''. 


[[Image:feature-wizard-setprocedure]] 


The feature that is generated in addition to the attribute itself is placed in feature clause <code>Element change</code> and is exported to all classes. If you have selected or entered an invariant, the precondition will protect this invariant. Example of a generated set-procedure: 


[[Image:feature-wizard-setprocedure-example]]


<code>
feature -- Element change

    set_button (a_button: EV_BUTTON)
            -- Assign `a_button' to `button'
        require
                a_button_not_void: a_button /= Void
        do
            button := a_button
        ensure
            button_assigned: button = a_button
        end
</code>