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() {this.message = message; }}///　　The event and the delegation of God horse contact?It is often said that the nature of a delegate is a type, and the nature of the event is an instance of a particular delegate type. The best way to do this is to look at the original code and the compiled IL Code for analysis.① Review Just the code that defines an event member in the Consolemanager classpublic event eventhandlerEventHandler is a standard event pattern that is provided in the. NET Framework.② th

: 0,1,2,3,4,5,6,7,8,9,102 binary: 0,18 binary: 0,1,2,3,4,5,6,716 Binary: 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,fOctal Start: 0Hex Start: 0xDecimal start: Nothing to do withDecimal: 89 corresponds to binary 101100189 ..... 144 ..... 022 ..... 011 ..... 15 ..... 12 ..... 01 ..... 110110011+0+0+8+16+0+64 = 89Bit bits8bit = 1BYTE = "Each byte has an address0x80030x80020x80010x80001 and-1Original code anti-code complement10000 00010000 00010000 0001 positive Inverse code, complement is equal to the original

{ if ([keyPath isEqual:@name]) { NSLog(@change name: old :%@, new : %@,[change objectForKey:NSKeyValueChangeOldKey],[change objectForKey:NSKeyValueChangeNewKey]); }}@endInitializing monitored objects and monitored objects in the controller, registering the viewer #import viewcontroller.h#import qyperson.h#import qypersonmonitor.h@interface ViewController () @ Property (Nonatomic, Strong) Qyperson *person; @end @implementation viewcontroller-(void) viewdidload {[Super Viewdidloa

This series will summarize the interesting and easily forgotten points of C++primer in the book that is being read.1. When the return statement includes a value, the type of the secondary return value must be the same as the function return type.2. Operator Endl. The effect of writing this symbol is: 1. Ends the current line (carriage return). 2. Swipe the contents of the buffer associated with the device to the device.3. Note Specifiers (/**/) cannot be nested.4. The IStream object encountered

","column"); }}→update-database-verboseSeed data for a database Public class Configuration:dbmigrationsconfiguraiton{ public Configuration () { false; true ; } protected Override void Seed (twittercontext context) { newnew ALias () }}}migrating databases in a production environment→ Execution: udb-script-verbose→ Pop up a window that can write SQL statements without connecting to the database at this timeALTER TABLE sometable add column nvarchar (ma

operation is complete before returning, ensuring the reliability of the dataFdatasync: Data block synchronization for individual files. Wait until the disk operation is complete before returning, ensuring the reliability of the dataMsync: Synchronizing dirty pages generated by mmapThe page recycling mechanism consists of three parts, data brush out flush, swap swap, releasing release.Data brush flush and data synchronization are similar, that is, the backup file of the page cache is synchronize

annoying side effects of using JNI. The most notable are dependencies on extension tools, such as compilers and connectors, as well as their run-time parameters.12. Cooja was originally developed on the Cygwin/windows and Linux platforms, but was later ported to MacOS.13, for the development under Windows, recommend the use of Cygwin, of course, the official development environment Instant Contiki is the most convenient14, at the beginning of the Cooja, but also need to configure it, in some ol

this point, the series of runtime finishing has been completed. Of course, this is just some basic knowledge of runtime induction, trying to play a role. There are also many interesting things about the runtime that need to be explored by the reader themselves.Note: If there is a mistake, please correct me, welcome to add QQ Friends: 1318202110 (South peak son)Reference Objective-c Runtime Reference Self and Super in Ios:objective-c Dynamic characteristics of Objective-c h

Binary Search Method: Private Static voidMain (string[] args) { int[] data =New int[Ten]; for(inti =0; I Ten; i++) {Data[i]= i +3; } for(inti =0; I Ten; i++) {Console.Write (Data[i]+" "); } Console.WriteLine (); intII = binarysearch.search (data,9); Console.WriteLine (ii); } Public Static classBinarySearch { Public Static intSearch (int[] Data,intval) { //if data is null, return-1 if(Data. Length 0) { retur

Code that needs refactoring:1 repetition2 lengthy subroutines3 A class with poor cohesion4 loop too long or nested too deep5 Long parameter list (7 parameters left and right)Swict Case Optimization:1 polymorphic2 Table DriverFunction Name:1 function command to describe its return value2 procedure naming to use a verb phraseFunction parameters:1 Incoming parameters cannot be modified2 parameter ordering: output-Modify-outputBoolean variable name:Use positive variables: Done, error, found, success

packet is received, it will start making a packet with Syn=1,ack=1, where the ACK number is to be confirmed to the client, so the number is one more than the SEQ in step A. At the same time our server must also confirm that the client can actually receive our packets, so it sends out seq=20001 to the client and begins to wait for the client to respond to our service.C: Loopback Acknowledgement PacketWhen the client receives an ACK from the server, it can confirm that the previously sent packet

(callback) method:In fact, this method can be used as a shortcut for a special case of $.each (array, callback)The array here is replaced by $ ("..."), a set of jquery collections. But the point to note is that within the callback method, the incoming item, the This parameter, is not a jquery object, but rather a Htmldom object. So if you want to manipulate the elements here, for example, use $ (this). e.g.$ ("table"). each (function () {alert (this); [Object Htmltableelement]Alert ($ (this));

stackIstore_3:10 of the top of the stack is assigned to the INT local variable at slot3, i.e. C, out of the stack.Bipush 20: Put 20 into the stackIstore 4:20 of the top of the stack is paid to the INT local variable at SLOT4, i.e. D, out of the stack.The above 4 instructions, to complete the assignment of C and D work.Iload_1, Iload_2, iload_3 These three instructions will slot1, Slot2, slot3 these three local variables into the stack:Imul: Stack the top two values on the stack, multiplying the

Improvements and supplements to the article "in-depth MDI customer Window Programming" Inventec group Electronic Technology Co., Ltd.To the sea ---- I read the article "deep into MDI client Window Programming" published in your newspaper. I am very interested in this article. I think it is very good. The whole window is shown in (Omitted: ---- However, the disadvantage is that when I drag the MDI child window with the mouse, the situation shown in F

reordering. These reordering can cause some strange problems in the concurrency program, such as-visibility issues.Now that the reordering is causing the problem, you can avoid these problems by preventing reordering at some point. The first is the compile-time prohibition of reordering, because the compile-time reordering rules are made by the Java compilation period, then Java certainly can do this prohibition. In the run-time, the processor-level prohibition of reordering requires the insert

, taskaffinity A and b,b are different from A, a starts with B with both the Flag_activity_task_on_home and the Flag_activity_new_task, and A and B are in different tasks , if B is only started in NewTask mode, then even if B and a are not in a TASK, then pressing the back key in B will return to a, but with Flag_activity_task_on_home, pressing the back key will return to home. At this point A has been moved to the background. the original team of embedded Penguin Circle consists of

has its own private virtual machine stack. The stack is created at the same time as the thread, where the stack frame of the thread is stored. Each method's invocation corresponds to a stack frame's stack and stack. Each thread has its own working memory, and the working memory holds a copy of the main memory of the variable that the thread needs to read and write. Thread-to-read operations on variables are performed directly in working memory and do not operate on the contents of main memory,

. When other methods call the Pop () method. It should be considered that the pop () may throw an exception, assuming that pop () throws the uncheckedexception, can not do extra processing, assuming that pop () is thrown by checked exception must be processed, can be captured with Try-catch , it is also possible to choose not to capture within this method and continue to throw with Throwskeyword. Such as: public void Callpop () throws Emptystackexception {... Pop (); The

analysisThe time of the heap ordering is mainly composed of the time overhead of the two parts: the initial heap and the duplicate rebuild heap, all of which are implemented by calling Heapsort. The worst time complexity for heap sorting is O (NLGN). Average time performance of heap sequencing is closer to worst-case performance Heap sorting is not appropriate for files with fewer records due to the number of times required to build the initial heap Heap sort is low sort, auxil

=NewGenerateanimal (NewDog ()); Dog.getname ();} Public classDogImplementsAnimal {@Override PublicString GetName () {System.out.println ("Dog"); return"Dog"; }} Public InterfaceAnimal {String getName ();} Public classGenerateanimalextendsAnimal> { PrivateT T; Generateanimal (T t) { This. T =T; } PublicString GetName () {returnT.getname (); }}Generic wild-wildcard characters@Test Public voidtestGeneric5 () {FruitNewFruit); FruitNewFruit); FruitNewFruit); GetData (F1); GetData (F2);