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Prototype inheritance of javascript

| definePropertyFallback ){Var ERR_NON_OBJECT_DESCRIPTOR = "Property description must be an object :";Var ERR_NON_OBJECT_TARGET = "Object. defineProperty called on non-object :"Var ERR_ACCESSORS_NOT_SUPPORTED = "getters setters can not be defined" +"On this javascript engine ";Object. defineProperty = function defineProperty (object, property, descriptor ){If (typeof object! = "Object" typeof object! = "Function") | object = null ){Throw new TypeError (ERR_NON_OBJECT_TARGET + object );}If (ty

Smart pointer (smart pointer) (1): auto_ptr

pointer).A simple implementation of a auto_ptr:TemplateclassX>class auto_ptr{Private: x* ptr;mutable BOOLowns; Public:typedefX Element_type;Explicit auto_ptr(x* p =0) __stl_nothrow:ptr (P), owns (p) {}auto_ptr(Const auto_ptr A) __stl_nothrow:ptr (A.ptr), owns (a.owns) {a.owns =0; }TemplateclassT>auto_ptr(Const auto_ptr0; }auto_ptroperator=(Const auto_ptr A) __stl_nothrow {if(a! = This) {if(

MFC window, parent window parentwindow, owner window Ownerwindow difference

possessed relationship, the latter is called the parent/child relationship. In this text, I put the owner window called the owners window. In other words, a window may be owned by a different window (owner) While there is a parent window, or it can have its own child window. In the CWnd Class of MFC, the owner window is saved in the M_hwndowner member variable, and the parent window is saved in M_hparent, but the two values do not necessarily correspond to the values in the Window object's data

MFC child windows and parent windows

is saved in the M_hwndowner member variable, and the parent window is saved in M_hparent, but the two values do not necessarily correspond to the values in the Window object's data structure.The relationship between the Windows determines the external performance of the window. such as display, destruction and so on.If the owner domain of a window data is not NULL, then it establishes a owner-owned relationship with the window, and the owning relationship determines:(1) The owned window is alwa

Thread Synchronization Summary

InitializeCriticalSection again. Precautions :1. The critical section allows only one thread to access at a time, and each thread must call the critical zone flag (that is, a critical_section global variable) before attempting to manipulate the critical zone data entercriticalsection. Other threads that want access are put to sleep, and the system stops allocating CPU time slices to them until they are awakened. In other words, a critical section can be owned by only one thread, and of course,

JQuery Selector Selector Summary _jquery

): Matches an object that internally owns the text element, including indirectly useful cases : Empty: Matches all objects with no child elements : Has (selector): Matches all objects that contain at least one child selector :p arent: Matches all parent objects, and the parent object contains objects that contain only text Visibility Filter Character: : Hidden: Matches all hidden objects, or hidden types in input : Visible: Match all visible objects

Efficiently traversing InnoDB b+trees with the page Directory--slot

. Arecord is said to "own" another record if it represents it in the pagedirectory. Each entry in the page directory "owns" the records between Theprevious entry in the directory, up to and including itself . The Count Ofrecords "owned" by each record was stored in the record header, that Precedeseach record.The number of slots is specified in the first field of the Index header section of the page. Page directory includes at least Infimum and supremu

Several methods of multithreading synchronization mechanism

Critical sectionCritical section (critical section) is used to achieve "exclusive possession". Scope of application is a single processBetween the threads. It is:A local object, not a core object.Fast and efficient.Not be able to have more than one critical section at the same time being waited.Unable to detect whether a thread has been discarded.You can implement mutual exclusion between threads and cannot be used to implement synchronization.SemaphoreSemaphore is used to track limited resource

[Translation] IP subnet division

learn how to use half of the available range to build a ruler. Chart G Remember, all subnets start from an even number and all subnet endpoints are odd. note that 0.0.0.0 to 0.255.255.255 (0.0.0.0/8) is not used, and 127.0.0.0 to 127.255.255.255 (127.0.0.0/8) is used for loop address. 127.0.0.0/8 is interpreted as: the network ID is 127.0.0.0, The subnet mask is eight 1 on the left, and a bunch of 0 subnets on the right The values of the first octal group of all Class A addresses are betw

Design of simple logic expression lexical analyzer with VC

Simple logical Expression Lexical analyzer The logical expressions to be parsed are as follows: EXISTS (x) (missile (x) and owns (Father (Nono), part_of (x))) => sells (West,x,nono) To handle logical expressions, you must first extract parts of the logical expression: keywords (and, or, not, ForAll, EXISTS, =>), predicates, and arguments, and must be removed for extra spaces in an expression. This work is done by a lexical analyzer. The most basic pa

Efficiently traversing InnoDB b+trees with the page Directory--slot

" another record if it represents it in the pagedirectory. Each entry in the page directory "owns" the records between Theprevious entry in the directory, up to and including itself . The Count Ofrecords "owned" by each record was stored in the record header, that Precedeseach record.The number of slots is specified in the first field of the Index header section of the page. Page directory contains at least Infimum and supremum slots. Therefore, the d

"Exceptional C + +" and "improve the performance of C + + programming Technology" Learning notes __ Programming

. Once an object is allocated from the heap, we need to know exactly who owns the object, because only the owner who owns the object can destroy it. But in the course of our actual use, this object may be passed to another object (for example by passing pointer arguments), and once the process is complex, it is difficult to determine who finally owns the object.

Oracle roles, permissions, and users

following is a brief introduction to these predetermined roles. The permissions that the role contains can be queried using the following statement:Sql>select * from Role_sys_privs where role= ' role name ';1. CONNECT, RESOURCE, DBAThese predefined roles are primarily for backwards compatibility. It is mainly used for database management. Oracle recommends that users design their own database management and security rights planning instead of simply using these predefined roles. In future relea

[C ++ 11] _ [primary] _ [Use Cases of unique_ptr]

]);} // 3. Custom deleter. {std: unique_ptr P3 (new Foo) ;}} void TestOwner () {std :: cout P1 (new Foo); // p1 owns Foo if (p1) p1-> bar (); {std: unique_ptr P2 (std: move (p1); // now p2 owns Foo f (* p2); p1 = std: move (p2 ); // ownership returns to p1 p2-> bar (); std: cout P1 (new Foo [4]); // p1 owns

Comparison of two locking mechanisms for reentrantlock and synchronized in Java

synchronization are correct), and that other threads that are correctly synchronized can see the latest values for those Variables. By defining a clear, cross-platform memory model that has been modified in JDK 5.0 to correct some of the errors in the original definition, it is possible to build a concurrency class "write once, run anywhere", by following this simple rule: whenever you write a variable that might be read by another thread, or if the variable you are reading is finall

Introduction to the lease mechanism

seriously, once the client is not contacted or the client's information is lost, the modification cannot continue.Cary G. Gray and David R. Cheriton of Stanford University in 1989 proposed the useLeasesMethods to maintain cache consistency. The so-called lease, is actually a contract, that is, the server gives the clientA certain periodInside canControlling modification Operationsof power. If the server wants to modify the data, it must first solicit the consent of the client that

Some learning about AppDomain. DoCallBack

Let's first see the MSDN document about this method: http://msdn.microsoft.com/en-us/library/system.appdomain.docallback.aspx The three examples are good, but helping yourself to understand better, you may need to twist them a little... Summary (the following is based on my understanding, for any mistake please comment below :)) There are three scenarios for DoCallBack method applies: 1. use Static DoCallBack method,In this, neither default or new domain own

About folder permissions in linux

describes the file permissions. Read Permission R. Simply put, it is the permission to open the file to view the content. On the web server, if the file does not have the permission to open, the web server considers the file does not exist and sends the 404 file not found error, it is represented by number 4. Write Permission for www.2cto.com. If a file does not have the write permission, the file cannot be changed. If the folder does not have the write permission, a new file cannot be created

How does ElementName Binding work-Part 2 BindingExpression

Document directory What happens when ElementName binding is used in DataTrigger? In part 1, I gave a general finding rule for ElementName binding, it works in most cases, however there are some cases you cannot explain them with the general rule. I will cover some of them in the following articles which involve some advanced concept in WPF, like BindingExpression and InheritanceContext.What happens when ElementName binding is used in DataTrigger? Take a look at following codes:

Winusb-no longer write drivers for your USB device

buffer Descriptor (BD). To program USB framework communications on pics, you need to understand BDS. A bd consists of four byte-wide registers that hold information about an endpoint's most recent data transfer or the next data transfer. the microcontroller core and the USB Module share ownership of the BD. the microcontroller core is the CPU that executesThe code, or firmware, That you program into the device. the USB Module, also called the Serial Interface Engine (SIE), provides hardware sup

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