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the object, the object is freed.(ii) Pointer classification:(1) Strong pointer: By default, all pointers are strong pointers, the keyword __strong(2) Weak pointer: _ _weak keyword-decorated pointerDeclare a weak pointer as follows:__weak person *p;In arc, the weak pointer is emptied directly as long as the weak pointer is not in the object.__weak person *p=[[person alloc] init];//unreasonable, the object once created is released, after the object is

1. The old project did not use arc, but the introduction of the third party library is the use of arc.2. Arc was used for its new project, but the introduction of Third-party libraries or previously written code did not use arc. In both cases, the direct affirmation is not compiled. You can do this by upgrading the ol

ARC forbids explicit message send of ' release ' Obviously, it's the arc problem. Error reason: the "use Automatic Reference counting" option was selected when the project was created, but the object's release method was also called What arc is. ARC is the new feature of iOS 5, the full name

Html5 canvas arc stroke gradient, html5canvas

Ctx. arcParameter description: (defines a center point, radius, start angle, end angle, and drawing direction: clockwise or counterclockwise ); Ctx. stroke: draws the border of the image; Ideas: 1. First Use ctx. moveTo to move the painting start point and ctx. arc to draw the path (the painting path here is not actually drawn to the canvas, just like the pen path tool in Photoshop ). 2. Use ctx. stroke (); To create a border and draw the border on t

The singleton pattern ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole.Here the main introduction under ARC, the use of GCD to achieve a single case.First step: Declare a static instanceStatic Soundtool *_instance;Step two: Overriding the initialization method+ (ID) Allocwithzone: (struct _nszone *) zoneThis method is called when the object is initialized to allocate memory, and wh

);}Firstthroght = false;}// Determine the feature typeInt indexofshape = pfeatureclass. findfield ("shape ");ESRI. ArcGIS. Geometry. esrigeometrytype pfeatureclassshapetype = pfeatureclass. shapetype;For (INT I = 0; I {Datarow = datatable. newrow ();For (Int J = 0; j {If (j = indexofshape){// Geometroy. shapetype ConversionSwitch (pfeatureclassshapetype){Case esrigeometrytype. esrigeometrypoint:Fieldname = "point ";Break;Case esrigeometrytype. esrigeometrypolyline:Fieldname = "polyline ";Break;

Add Current Arc Optimization #define INF (1 The speed is strange. POJ3469 is slower than the previous pre-stream push, but the HDU4280 can speed up to 4000 +. Because it is recursive, pay attention to stack explosion.

A simple microblog model is designed: the User class and Status class are used to simulate the implementation of the non-ARC mechanism in two ways, there is no big difference between the two. The reason is that they are written to facilitate learning and comparison! First, it is easy to understand the code without using atuorelease and the automatic release pool, but it is generally not written as follows during development: copy the code/************

Objective-C in IOS: learning the singleton mode in ARC, iosobjective-c The Singleton mode is a commonly used design mode. The most common purpose is to save and transmit data. This is due to the features of the singleton mode. First, let me briefly introduce the features of Singleton mode. Three features of Singleton mode: 1. A class can only have one instance; 2. It must create the instance on its own; 3. It must provide this instance to the entire s

arc mark at 1/5 under the nail, which is a half-month mark, which is also called the small sun.The half-month mark of nails is the line between yin and yang meridians, and represents the essence of the human body. It is also known as the Health circle.The development of the half-month mark is affected by the nutrition, environment, and physical quality. When the digestion and absorption functions are poor, the half-month mark will be blurred, reduced

::initWithDuration(duration)){m_ptCenter= ptCenter;m_fAngleDelta= deltaAngle;return true;}return false;}CCObject* CCArcBy::copyWithZone(CCZone* pZone){CCZone* pNewZone = NULL;CCArcBy* pCopy = NULL;if(pZone pZone->m_pCopyObject) {//in case of being called at sub classpCopy = (CCArcBy*)(pZone->m_pCopyObject);}else{pCopy = new CCArcBy();pZone = pNewZone = new CCZone(pCopy);}CCActionInterval::copyWithZone(pZone);pCopy->initWithDuration(m_fDuration, m_ptCenter, m_fAngleDelta);CC_SAFE_DELETE(pNewZone

variable that holds the strong reference to object B is the member variable obj of object A. Both object A and object B have lost their role and should be discarded, but not discarded. A memory leak has occurred! */Circular references are prone to memory leaks, so-called memory leaks mean that objects that should be discarded persist beyond their lifetimes.As in this case, there is only one object, but a circular reference occurs when the object holds itself. ID _strong obj = [[NSObject all

Links: http://acm.hust.edu.cn/vjudge/problem/viewProblem.action?id=46252The silly matrix accelerates. QwQ#include #include#include#include#include#defineLL Long Long#defineMoD 1000000007using namespacestd; LL N;intax, ay, A0, BX, by, B0, Qwq;structmatrix{ints[5][5]; voidClear () {memset (s),0,sizeof(s)); }}ans, A;intMulintAintb) {//cout return(int) (ll) ((LL) * (LL) b)%mod);} Matrixoperator*(matrix A, matrix B) {matrix C; C.clear (); for(inti =0; I 4; i++){ for(intj =0; J 4; J + +

Objc_autoreleasepoolpush call is made, runtime add a Sentinel object to the current autoreleasepoolpage with a value of 0 (that is, nil), then this page becomes the following:The return value of the Objc_autoreleasepoolpush is exactly the address of the Sentinel object, which is Objc_autoreleasepoolpop (Sentinel object) as the entry, and thus:1. Locate the page where the Sentinel object is located, based on the address of the incoming Sentinel object2. In the current page, send the release mess

. h file # define HMSINGLETONH (name) + (instancetype) shared# #name;//. m file # define HMSINGLETONM (name) static ID _instance;Use macro to define singleton mode in ARC mode (GCD implementation of Singleton mode)

One, the loop references the most common code types.-(void) viewdidload { [super viewdidload]; Additional setup after loading the view, typically from a nib. Nsmutablearray *firstarray=[[nsmutablearray Alloc]init]; Nsmutablearray *secondarray=[[nsmutablearray Alloc]init]; [Firstarray Addobject:secondarray]; [Secondarray Addobject:firstarray]; }Second, a circular reference to the solution.1, the programmer disconnects a loop manually and stops the circular reference.2

_strong person *p Strong pointer_weak person *p Weak pointerPerson *p strong pointer, default is strong pointerSingle ObjectAs long as there is no object pointed to by a strong pointer in arc, the memory is freed_weak person *p=[[person Alloc]init];It will be released when it is created.Multi-ObjectPeople have dogs.@property (Nonaatomic,strong) Dog *dog;When the dog is released separately, dog is not necessarily released because it is possible that th

method of the referenced class . 2> Both ends of the circular reference solution (loop retain)One end with retain, one end with assign. , Car end: @property (nonatomic,retain) person *person; Person side: @propertor (nonatomic,assign) Car *car8. AutoreleaseEg:person *p = [[Person alloc] init] autorelease]; There must be a release pool in order to write Autorelease function: 1>autorelease will place the object in an auto-release pool, and when the auto-free pool is destroyed, it wil

the Protocol I need to directly invoke the method of the line, do not care about this member variable will become who!For example:Create an agreement with two ways to check the fare and the number of ticketsDailixieyi.h file #import @protocol dailixieyi -(int) piaoshu; @end #import #import "Dailixieyi.h" #import #import "Daili1.h" -(int) Piaoshu { Return 15;//Assuming back there are 15 tickets }