Generic container Unit (generics.collections) [2]: tqueue<t> Queue list

Source: Internet
Author: User

Tqueue and Tstack, one is the queue list, one is the stack list; One is advanced first out, one is advanced and then out.

Tqueue has three main methods and one property:
Enqueue (into Row), Dequeue (dequeue), Peek (see the next element to be out);
Count (total number of elements).


This example:


Code files:

UnitUnit1;InterfaceusesWindows, Messages, sysutils, variants, Classes, Graphics, Controls, Forms, Dialogs, Stdctrls;typeTForm1 =class(Tform)    Memo1:tmemo;    Button1:tbutton;    Button2:tbutton; Button3:tbutton;procedureFormcreate (Sender:tobject);procedureFormdestroy (Sender:tobject);procedureButton1Click (Sender:tobject);procedureButton2click (Sender:tobject);procedureButton3click (Sender:tobject);End;varForm1:tform1;Implementation{$R *.DFM}usesGenerics.collections;{Delphi 2009 New Generic Container unit}typeTRec =RecordName:string; Age:word;End;varqueue:tqueue<trec>;{defines a generic Tqueue class, which specifies the TREC record to use for the definition above}{Build}procedureTform1.formcreate (Sender:tobject);beginQueue: = Tqueue<trec>.  Create;  Memo1.clear; Button1.caption: = Button1.caption +' into row '; Button2.caption: = Button2.caption +' dequeue '; Button3.caption: = Button3.caption +' next dequeue ... ';End;{Release}procedureTform1.formdestroy (Sender:tobject);beginQueue.free;End;{into row: Enqueue}procedureTform1.button1click (Sender:tobject);varRec:trec;beginRec. Name: = Stringofchar (Char ( $+ Random ( -)),3); Rec. Age: = Random ( Max);  Queue.enqueue (REC); Text: = Format (' Total number of current queue members:%d ', [Queue.count]);{let Memo1 mate display}MEMO1.LINES.ADD (Format ('%s,%d ', [Rec. Name, rec. Age]));End;{dequeue: Dequeue}procedureTform1.button2click (Sender:tobject);varRec:trec;beginifQueue.count =0  ThenExit;  Rec: = Queue.dequeue; ShowMessage (Format ('%s,%d ', [Rec. Name, rec.  Age])); Text: = Format (' Total number of current queue members:%d ', [Queue.count]);{let Memo1 mate display}Memo1.Lines.Delete (0);End;{Next dequeue element: Peek}procedureTform1.button3click (Sender:tobject);varRec:trec;beginifQueue.count =0  ThenExit;  Rec: = Queue.peek; ShowMessage (Format ('%s,%d ', [Rec. Name, rec. Age]));End;End.

Form file:

ObjectForm1:tform1 left =0Top =0Caption =' Form1 'ClientHeight =147ClientWidth =284Color = Clbtnface Font.charset = Default_charset Font.Color = Clwindowtext Font.height =- OneFont.Name =' Tahoma 'Font.style = [] Oldcreateorder = False Position = Podesktopcenter OnCreate = formcreate OnDestroy = Formdestroy Pixel Sperinch = theTextHeight = -ObjectMemo1:tmemo left =0Top =0Width =121Height =147Align = Alleft Font.charset = Default_charset Font.Color = Clwindowtext Font.height =- -Font.Name =' Courier New 'Font.style = [] Lines.strings = (' Memo1 ') Parentfont = False ScrollBars = Ssboth TabOrder =0Explicitheight =201EndObjectButton1:tbutton left =127Top = +Width =146Height = -Caption =' Button1 'TabOrder =1OnClick = Button1ClickEndObjectButton2:tbutton left =127Top = AWidth =146Height = -Caption =' Button2 'TabOrder =2OnClick = Button2clickEndObjectButton3:tbutton left =127Top = AboutWidth =146Height = -Caption =' Button3 'TabOrder =3OnClick = Button3clickEndEnd

Generic container Unit (generics.collections) [2]: tqueue<t> Queue list

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.