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12.5.5 Formal Interface Types

1/2
The category determined for a formal interface type is the category of all interface types. 

Syntax

2/2
formal_interface_type_definition ::= interface_type_definition

Legality Rules

3/2
The actual type shall be a descendant of every progenitor of the formal type.
4/2
The actual type shall be a limited, task, protected, or synchronized interface if and only if the formal type is also, respectively, a limited, task, protected, or synchronized interface. 

Examples

5/2
type Root_Work_Item is tagged private;
6/2
generic
   type Managed_Task is task interface;
   type Work_Item(<>) is new Root_Work_Item with private;
package Server_Manager is
   task type Server is new Managed_Task with
      entry Start(Data : in out Work_Item);
   end Server;
end Server_Manager;
7/2
This generic allows an application to establish a standard interface that all tasks need to implement so they can be managed appropriately by an application-specific scheduler.

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