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C ++ meditation book note (Chapter 6)-handle: Part 1

When a proxy is created, the objects on the proxy will be copied. How can this replication be avoided? You can use the handle class. The handle class is similar to the smart pointer class. By using the * and-> operators of the overload handle class, the handle class can be transformed into a smart pointer. In terms of effect, handle is a container that only contains a single object. It avoids copying by allowing multiple handle objects to point to the same object. Define the handle class. We als

"C + + meditation" Handle 1

1, in the "C + + meditation" proxy class, the use of proxy classes, there are problems:A, agent replication, each time you create a copy, the cost is likely to be largeb, some objects can not easily create a copy, such as file2, how to solve this problem?Encapsulates a dynamic resource with a reference-count handle, a handle that contains pointers, and multiple handles can point to the same object. When copying, just copy the handle of the pointer.3. Using a reference count handle is to avoid un

T-SQL (base) of database series

Label:Variable 1 Variable classificationGlobal variables, local variables.2 Local VariablesDECLARE @ variable name variable type [, @ variable name variable type ...]Declare @Name varchar (+) Declare @upoint int,@birthdaydatetimeNote: Before a local variable is assigned a value, its value is null.2.1 Local variable AssignmentSET @ local variable = variable valueOrSELECT @ local variable = variable valueSet only supports assigning a value to a variable

T-SQL statements create stored procedures and trigger exercises

points plus 10, the number of posts plus 1.CREATE trigger Publish on Bbstopic for insert asBeginDECLARE @yhID as intDECLARE @bkID as intSelect @yhID =tuid, @bkID =tsid from inserted update bbsuser set upoint=upoint+10 where @yhID =uid update bbssessionSet stopiccount=stopiccount+1where @bkID =sid EndAfter the INSERT statement is executed:InsertIntobbstopic (Tid,tsid,tuid,ttopic,tcontents,tclickcount,tflag,

C + + Contemplative learning note Sixth chapters handle (reference counting pointer embryonic?) )

A simple point-coordinate classClass Point {PublicPoint (): Xval (0), Yval (0) {}Point (int x,int y): Xval (x), Yval (y) {}int x () const {return xval;}int y () const {return yval;}point x (int xv) {xval = XV; return *this;}point y (int yv) {yval = YV; return *this;}Privateint Xval, yval;};Bind the handle to it on a layer of encapsulationControlling those operations through handle exposes those operations that are private to prevent users from manipulating the address of a pointIt is more import

Java Enumeration type enum

Light {RED (1), GREEN (2), YELLOW (3); public final int nCode; private Light (int nCode) {this. nCode = nCode ;}} public static void testTraversalEnum () {Light [] allLight = Light. values (); for (Light aLight: allLight) {System. out. println (aLight. name () + "" + aLight. ordinal () + "" + aLight) ;}} public static

Java SE learning enumeration Summary

(); // 2. Use System. out. println (" to demonstrate the use and traversal of EnumMap objects ...... "); TestEnumMap (); // 3. demonstrate how to use System. out. println (" to demonstrate how to use and traverse EnumSet objects ...... "); TestEnumSet ();}/*** demonstrate enumeration traversal */private static void testTranversalEnum () {Light [] allLight = Light. values (); for (Light aLight: allLight) {System. out. println ("current lamp name:" +

JAVASCRIPT+HTML5 Canvas Draw a turntable draw _javascript tips

understood can Baidu, or inquires me above to share the Chinese handbook.The HTML code is: Effect Chart: Click the event execution code: $ ('. Lunck_draw_wrap '). Delegate ("Img.pointer", "click", Function () { if (turnplate.brotate) return; Turnplate.brotate =!turnplate.brotate; $.getjson (".. /ajax/lottery.ashx "," ", function (data) { //1090 system configuration error, 1091 users did not log in or user data abnormal, 1092 users residual points, 1093 did not win

Javascrip + HTML5 Canvas draw turntable lottery, javascriphtml5

. code. toString () = "1094") {iosalert ("more than the number of Lottery draws per day")} else {var up Oint = 0; upoint = parseInt ($ ("# uPoint" ).html ()-parseInt ($ ("# sPoint" ).html ()); $ ("# uPoint" ).html (upoint); if (data. isWin = 'true') {item = getArrayIndex (turnplate. restaraunts, data. name); rotateFn (

Drawing Crip + HTML5Canvas draw turntable lottery _ javascript skills

")} elseif (data. code. toString () = "1092") {iosalert ("insufficient user points remaining")} elseif (data. code. toString () = "1094") {iosalert ("more than the number of Lottery draws per day")} else {var up Oint = 0; upoint = parseInt ($ ("# uPoint" ).html ()-parseInt ($ ("# sPoint" ).html ()); $ ("# uPoint" ).html (upoi

OC tutorial 5-delegate mode callback

SwitchDelegate; // Forward Declaration, inform the compiler SwitchDelegate as a protocol @ interface SwitchD: NSObjecttypedef enum: NSUInteger {SwitchStateOff, // default SwitchStateOn,} SwitchState; @ property (nonatomic, assign, readonly) SwitchState currentState; @ property (nonatomic, weak) id Delegate; @ end @ protocol SwitchDelegate // When the switch status changes, this method of the principal is called for Status feedback. -(Void) switchD :( SwitchD *) s

Unity Learning Note 3

One: The script that controls the light:public light alight;alight = Gameobject.find ("The name of an object with a light"). GetcomponentThe code above can pass the code information to the light component of the object.ALight.light.intensity = a float number less than 8;//This will control the brightness of the light component.Note that after this writing, in the Inspector panel options can not set the targ

Anhui Fuyang Most of the college entrance examination repetition school-long Xiang Gao Fu best

", " Hefei Private high-quality school "," the most powerful education group, "won the" Private education gold word-of-mouth gold medal ", 2013 was named" the most influential educational institutions "; 2009-2014 for six consecutive years by the Consumer Association of Anhui Province as a" good faith school units. " Choose Long Xiang is the choice of success! Long Xiang Gao for you to open the door of the ideal university!Tel: 0551-62643088 62649088 Mobile: 13665513371 15955175588 15215510088 1

Big Data Learning Note 3 • Big data in social computing (1)

processing is anonymized, Bus: Bus line number. Boarding: Upper Station Alighting: Lower StationThere are two types of buses: Non-ladder-priced buses and ladder-priced buses. Non-ladder-based bus is the line that the user pays a fixed fee when the bus is traveling, and the ladder-valued bus refers to the line that the user pays according to the distance of travel. The two types of buses are different from the upper station and the alight

The best college entrance examination in Chuzhou, Anhui

", " Hefei Private high-quality school "," the most powerful education group, "won the" Private education gold word-of-mouth gold medal ", 2013 was named" the most influential educational institutions "; 2009-2014 for six consecutive years by the Consumer Association of Anhui Province as a" good faith school units. " Choose Long Xiang is the choice of success! Long Xiang Gao for you to open the door of the ideal university!Tel: 0551-62643088 62649088 Mobile: 13665513371 15955175588 15215510088 1

Java enum type enum

Public String toString () {returnstring.valueof (this. nCode); } } /** *@param args*/Public static void Main (string[] args) {//1. Traverse the enumeration type System. println ("demonstrates the traversal of enumeration types ..." ); Testtraversalenum (); //2. Demonstrates the use of the Enummap object using System. println ("demonstrates the use and traversal of Enmumap objects ....." ); Testenummap (); //3. Demo Enmuset using System. Out. println ("demonstrates the

"Go" Java enumeration type use of enum

[] args) {1. Traversing enumeration typesSystem. out. println ("Demo enumeration type traversal ...");Testtraversalenum ();2. Demonstrating the use of Enummap objectsSystem. out. println ("demonstrates the use and traversal of Enmumap objects ...");Testenummap ();3. Demonstrating the use of EnmusetSystem. out. println ("demonstrates the use and traversal of Enmuset objects ...");Testenumset ();}/*** Demonstration of enumeration type traversal*/Private Static void Testtraversalenum () {Light[]

T-SQL create database

default (1) for Usex, -- default gender is maleConstraint DF_UregDate default (getdate () for UregDate, -- the default registration date is the system date.Constraint DF_Ustate default (0) for Ustate, -- the status is offline by default.Constraint DF_Upoint default (20) for Upoint, -- the default point is 20Constraint CK_Uemail check (Uemail like '% @ %'), -- the email must contain the @ symbolConstraint ck_upassword check (LEN (upassword)> = 6) -- T

Windows graphics programming Basics

following statement:Setrect ( rect, xleft, ytop, xright, ybottom );An area is used to describe a part on a display that is composed of a rectangle, other polygon, and an elliptical shape. It can be drawn or cropped using an area.Available:Hrgn = creatergn (xleft, ytop, xright, ybottom );  OrHrgn = createrectrgnindirect ( rect );To create a rectangular area, you can also use:Hrgn = createllipsergn (xleft, ytop, xright, ybottom );Or:Hrgn = createellipsergnindirect ( rect );To create an elliptical

Use of mutexes in C # multithreaded series

A mutex is a kernel object that is used to ensure that a thread is exclusive of access to a resource, and that the mutex can be used for mutually exclusive access to resources in different processes.We can think of a mutex as a taxi and a passenger as a thread. Passengers first wait for the bus, then get on the bus and finally alight. When a passenger is in the car, the other passengers are only allowed to get on when he gets off the bus. The same is

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