ATL uses the following classes to support connection points:

• IConnectionPointImpl implements a connection point. The IID of the outgoing interface it represents is passed as a template parameter.

• IConnectionPointContainerImpl implements the connection point container and manages the list of IConnectionPointImpl objects.

• IPropertyNotifySinkCP implements a connection point representing the IPropertyNotifySink interface.

• CComDynamicUnkArray manages an arbitrary number of connections between the connection point and its sinks.

• CComUnkArray manages a predefined number of connections as specified by the template parameter.

• CFirePropNotifyEvent notifies a client's sink that an object's property has changed or is about to change.

• IDispEventImpl provides support for connection points for an ATL COM object. These connection points are mapped with an event sink map, which is provided by your COM object.

• IDispEventSimpleImpl works in conjunction with the event sink map in your class to route events to the appropriate handler function.

Connection Point