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A.18.29 The Generic Package Containers.Bounded_Synchronized_Queues

Static Semantics

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The language-defined generic package Containers.Bounded_Synchronized_Queues provides type Queue, which implements the interface type Containers.Synchronized_Queue_Interfaces.Queue.
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with System;
with Ada.Containers.Synchronized_Queue_Interfaces;
generic
   with package Queue_Interfaces is new Ada.Containers.Synchronized_Queue_Interfaces (<>);
   Default_Capacity : Count_Type;
   Default_Ceiling  : System.Any_Priority := System.Priority'Last;
package Ada.Containers.Bounded_Synchronized_Queues is
   pragma Preelaborate(Bounded_Synchronized_Queues);
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   package Implementation is
      ... -- not specified by the language
   end Implementation;
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   protected type Queue
        (Capacity : Count_Type := Default_Capacity;
         Ceiling  : System.Any_Priority := Default_Ceiling)
           with Priority => Ceiling is
        new Queue_Interfaces.Queue with
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      overriding
      entry Enqueue (New_Item : in Queue_Interfaces.Element_Type);
      overriding
      entry Dequeue (Element : out Queue_Interfaces.Element_Type);
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      overriding
      function Current_Use return Count_Type;
      overriding
      function Peak_Use return Count_Type;
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   private
      ... -- not specified by the language
   end Queue;
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private
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   ... -- not specified by the language
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end Ada.Containers.Bounded_Synchronized_Queues;
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The semantics are the same as for Unbounded_Synchronized_Queues, except:
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The capacity for instances of type Queue is bounded and specified by the discriminant Capacity. 

Implementation Advice

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Bounded queue objects should be implemented without implicit pointers or dynamic allocation. 

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