Ada 编程/库/Ada.Containers.Bounded_Priority_Queues

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---

此语言特性在 Ada 2012 中引入。

Ada.Containers.Bounded_Priority_Queues 是自 Ada 2012 以来 预定义语言环境 的一个单元。

规范

--                     Standard Ada library specification
--   Copyright (c) 2004-2016 AXE Consultants
--   Copyright (c) 2004, 2005, 2006 Ada-Europe
--   Copyright (c) 2000 The MITRE Corporation, Inc.
--   Copyright (c) 1992, 1993, 1994, 1995 Intermetrics, Inc.
--   SPDX-License-Identifier: BSD-3-Clause and LicenseRef-AdaReferenceManual
-- -------------------------------------------------------------------------

with System;
with Ada.Containers.Synchronized_Queue_Interfaces;
generic
   with package Queue_Interfaces is new Ada.Containers.Synchronized_Queue_Interfaces (<>);
   type Queue_Priority is private;
   with function Get_Priority
     (Element : Queue_Interfaces.Element_Type) return Queue_Priority is <>;
   with function Before
     (Left, Right : Queue_Priority) return Boolean is <>;
   Default_Capacity : Count_Type;
   Default_Ceiling  : System.Any_Priority := System.Priority'Last;
package Ada.Containers.Bounded_Priority_Queues is
   pragma Preelaborate(Bounded_Priority_Queues);

   package Implementation is
       --  not specified by the language
   end Implementation;

   protected type Queue
        (Capacity : Count_Type := Default_Capacity;
         Ceiling  : System.Any_Priority := Default_Ceiling)
           with Priority => Ceiling is
      new Queue_Interfaces.Queue with

      overriding
      entry Enqueue (New_Item : in Queue_Interfaces.Element_Type);
      overriding
      entry Dequeue (Element : out Queue_Interfaces.Element_Type);

      not overriding
      procedure Dequeue_Only_High_Priority
        (At_Least : in     Queue_Priority;
         Element  : in out Queue_Interfaces.Element_Type;
         Success  :    out Boolean);

      overriding
      function Current_Use return Count_Type;
      overriding
      function Peak_Use return Count_Type;

   private
       --  not specified by the language
   end Queue;

private

    --  not specified by the language

end Ada.Containers.Bounded_Priority_Queues;

另见

华夏公益教科书

• Ada 编程/库/Ada
• Ada 编程/库/Ada.Containers

外部示例

• 搜索 Ada.Containers.Bounded_Priority_Queues 的 示例：Rosetta Code，GitHub (gists)，任何 Alire 包 或者 这本华夏公益教科书。
• 搜索与 Ada.Containers.Bounded_Priority_Queues 相关的 帖子：Stack Overflow，comp.lang.ada 或者 任何与 Ada 相关的页面。

Ada 参考手册

Ada 2012

• A.18.31: The Generic Package Containers.Bounded_Priority_Queues ^{[带注释的]}

开源实现

FSF GNAT

• 规范：a-cbprqu.ads
• 主体：a-cbprqu.adb