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Detailed Description

A Controller is a one-way channel for information to travel from outside a model/view/controller system into the system. It is intended to send notifications into the system of events outside the system. A controller is not allowed to display anything about the system to which it belongs -- that is the responsibility of a View [1].

Refinement Of:
Associated Types:
The only type associated with the controller is the data structure that view is intended to represent. This is the value_type of the controller, and is used when setting the view to a new value of that type. In order to set a value within a model, a notification callback must be bound to the controller from the model.
Value Type typename controller_model_type<Controller>::type The value type for the data for which the controller is sending notifications
T A type that is a model of View
t Object of type T
Valid Expressions:
NameExpressionType requirementsReturn type
Monitor monitor(t, p); See monitor for requirements onp void
Expression Semantics:
Complexity Guarantees:
Type(s) Modeling this Concept:
  • Any device that sends information from outside a system into the system itself. An example might be an audio microphone or a checkbox when it is selected (however, its visual updating is a View property, not part of its functionality as a controller).
  • [1] It is legal for any one implementation to model both a Controller and a View at the same time.
See Also:
    void my_notification_proc(const typename controller_model_type<Controller>::type& x)
        std::cout << "the value of the controller changed to " << x << std::endl;

    Controller t;

    using adobe::monitor;
    monitor(t, &my_notification_proc);

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