circular waveguide

, shared_ptr The implementation of smart pointers also embodies the object-based principle of C ++. objects should be responsible for their managed resources, including resource allocation and release, in addition, it is best to automate the release and allocation of resources. A typical implementation method is to allocate resources in the constructor and release resources in the destructor, in this way, when other programmers use this object, there is almost no extra worry about the resource

PHP implements the special effect of Chinese circular seals ,. PHP implements the special effect of Chinese circular seals. Method 1: php ** Chinese circular seals * @ authorlkklianq.net * @ createon10: 032012-5-29 * @ example: * $ sealnewcircleSeal (you and I use PHP to implement the special effect of Chinese circular

1. Custom Circular Control Roundimageview PackageCom.ronye.CustomView;ImportAndroid.content.Context;ImportAndroid.content.res.TypedArray;ImportAndroid.graphics.Bitmap;ImportAndroid.graphics.Canvas;ImportAndroid.graphics.Paint;ImportAndroid.graphics.PorterDuff;ImportAndroid.graphics.PorterDuffXfermode;ImportAndroid.graphics.Rect;Importandroid.graphics.drawable.BitmapDrawable;Importandroid.graphics.drawable.Drawable;Importandroid.graphics.drawable.NineP

in a previous article, we introduced the reference problem of array manipulation objects and the concept of an auto-release pool. today we continue to look at a pain in the reference count: Circular referenceOn the issue of circular references, there is not much explanation here, that is, multiple objects are referenced to each other, forming loops.Take a look at a specific example: reference to each other

A similar network request can cause a circular reference, butIf the network Request object is a local variable, you must use self, cannot use weakself, otherwise, once the current method object is destroyed, then the weakself is empty (if this is the case, it is another matter), because the block will be copied into the heap, The memory in the current method is then destroyed from the stack, and self is nil.If the object that the network requests is a

Collision Detection Algorithm: point-and-rectangle collision, point-and-circle collision, rectangular collision, and circular collision Point and rectangle collision [Java] /** * * @ Param x1 * @ Param y1 * @ Param x2 rectangular view x * @ Param y2 rectangular view y * @ Param w rectangular view width * @ Param h rectangular view height * @ Return */ Public static boolean isCollsion (int x1, int y1, int x2, int y2, int w, int h ){ If

All reference counting systems have problems with cyclic applications.For example, the following reference relationship object:A was created and referenced to object B.Object B was created and referenced to object C.Object C was created and referenced to object B.At this time, the reference counts for B and C are 2 and 1, respectively. When a no longer uses B, the call release releases the ownership of B, because C also references B, so the reference count for B is 1,b and will not be freed. B i

One, Parent-child Mutual holding, commissioned model"Case":@interface Ftappcentermainviewcontroller (){}@property (weak,nonatomic) uitableview* Mytableview;@endThe Mytableview in this use the weak modifier.@property (nonatomic, weak) iddelegate;"Recommended Method":Child only the object of the parent is the weak type:@property (nonatomic, weak) iddelegate;Second, block"Case":Look at the following code:typedef void (^requestnavicallback) (Nsinteger navicode,nsinteger httpcode,nserror * error);@in

Application of Android custom control series-circular progress bar and android progress bar I. Overview In the previous blog, we introduced the basics of the Android custom control series. Link: http://blog.csdn.net/qq_24908939/article/details/44589669 In this blog post, we will rewrite the ondraw () method and custom attributes to implement the Circular progress bar based on the basic articl

ARC-circular reference-solution, arc-reference solution 1. The most common type of code for loop reference. -(Void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. optional * firstArray = [[NSMutableArray alloc] init]; NSMutableArray * secondArray = [[financialloc] init]; [firstArray addObject: secondArray]; [secondArray addObject: firstArray];} Ii. Solution to

Recently in the development of the page, you need to make a dynamic circular progress bar, the first thought is the use of two rectangles, the width is equal to half the diameter, the height is equal to the diameter, two rectangles using floating paste together, set the Overflow:hidden property, as a box, the interior has a height equal to the child box, The upper-left and lower-left corner of the child box on the left and the upper-right and lower-ri

menu (title) { this.title = title This.elem = document.getElementById (' id ')}var menu = new Menu (' My Menu ') ) Document.body.innerHTML = " //(1) menu = new Menu (' his menu ')//(2)Consider the memory structure:In step (1), the body.innerhtml is cleared, so its child nodes are also deleted because they are no longer associated.But this element #id is an exception, he is connected by Menu.elem, so the object will always exist in memory, of course. Assuming you check his parentnode, you wil