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Standard C ++ simulation of delegate in. net

result_type;};Template Struct function_traits {Typedef RT result_type;Typedef at argument_type;};Template Struct function_traits {Typedef RT result_type;Typedef AT1 first_argument_type;Typedef at2 second_argument_type;}; // Function traits, used to extract the return type of class member functions Template Struct function_traits {Typedef ot object_type;Typedef RT result_type;};Template Struct function_traits {Typedef ot object_type;Typedef RT result_

Java thread Sleep (), join (), and yield method

main thread!! +I ' m main thread!! -I ' m main thread!!Yield () Method Example:1 Public classthread1{2 Public Static voidMain (string[] args) {3Testthread t1=NewTestthread ("T1");4Testthread t2=NewTestthread ("T2");5 T1.start (); T2.start ();6 }7 }8 9 classTestthreadextendsthread{Ten PublicTestthread (String s) { One Super(s); A } - Public voidrun () { - for(inti=1;i) { theSystem.out.println (GetName () + ":" +i); - if(i%10==0){ -Yield ();//w

The inode numbers in the partitions are blocks of numbers No. 0 and 1th.

/5': No Such file or directorySo where is the inode for the 0 or 1 block?The relationship between boot sector and SuperblockWhen block is 1024x768 bytes (1K):If the block size is exactly 1024, then the boot sector and Superblock will each occupy a block, which means that the boot sector is independent of the superblock.[Email protected] ~]# dumpe2fs/dev/HDC1DUMPE2FS1.39( in-may-2006) Filesystem volume name:/boot .... (omitted in the middle) .... First block: 1Block Size:1024x768.... (omitted in

Concurrent programming--java thread-based state transitions

=NewThread1 ();7Thread T1 =NewThread (Runnable1, "T1");//thread enters initial state8T1.start ();//thread goes into ready state9 TenThread2 t2 =NewThread2 ();//thread enters initial state OneT2.setname ("T2"); AT2.start ();//thread goes into ready state - } -}Creation of ThreadsA thread's surrenderWhen the process is executing, the time slice is exhausted or the yield method is actively executed, the process releases the execution state r

Research on overflow vulnerability of Winamp stack

Winamp, as one of the most mainstream music players in the 90, still has a large number of loyal fans. Of course there are many loopholes. The following is an analysis of a buffer overflow vulnerability that is triggered by opening the software's update history information.0x01 Vulnerability ReplayThe normal Whatsnew.txt file is located Winamp in a folder, and the update history information is saved for the software. In order to reproduce the vulnerability, we need to overwrite the original what

Compile and install Ixgbe-driven tutorials in the Debian Linux system _linux

Intel's 10G network adapters (for example, 82598, 82599, x540) are supported by the Ixgbe driver. Modern Linux distributions are already powered by Ixgbe, and can be used in the form of loadable modules. However, there are situations where you want to compile and install IXGBE drivers on your machine, for example, when you want to experience the latest features of the IXBGE drive. Similarly, one problem with the kernel default Ixgbe drive is that you

Performance Comparison Between SUSE and RedHat Systems

provide a better performance experience. To this end, we have prepared a comparison between the SUSE Linux Enterprise 12 operating system and RedHat Enterprise Linux 7.0. I believe this will help you understand the performance of the new system. The new version of the operating system we tested this time is the Server version. This new product makes breakthroughs in key business RAS features, open source code innovation, and automated IT management. Before testing, let's take a look at the

Summary of KVM virtualization Network Optimization Technology

designed to enable SR-IOV functionality. By default, the SR-IOV feature is disabled and PF acts as a traditional PCIe device.Devices with SR-IOV capabilities can take advantage of the following:Performance-access the hardware directly from the virtual machine environment.Cost reduction-the saved capital and operating expenses include:Energy SavingReduced the number of adaptersSimplified cablingReduces switch portsSriovUseStart the srivo kernel moduleModprobe igbActivate virtual function VFModpr

Performance Comparison Between SUSE and RedHat Systems

breakthroughs in key business RAS features, open source code innovation, and automated IT management. Before testing, let's take a look at the hardware platform we have prepared.Hardware name hardware model processor Xeon E5-2699 v3 processor memory Samsung 128 GB DDR4 hard disk Seagate Savvio 15.3 hard disk capacity 300 GB * 2 Nic Intel X540-T2In this test, we use SUSE Linux Enterprise 12 and RedHat Enterprise Linux 7.0. It is worth mentioning that

OpenCV Learning (5) image pixel access, color channel separation and fusion

end of the image matrix, and add the * operator to the iterator pointer to access the current point;3) "Method three" dynamic address calculation;void Colorreduce (mat inputimage, mat outputimage, intDiv) {//Parameter PreparationOutputimage = Inputimage.clone ();//Copy argument to temp variableint rowNumber = outputimage.rows;//number of rowsint colnumber = Outputimage.cols;//Number of columns //Access color image pixels for(int i =0; i for(Int j =0; J //------------------------"Start p

Java Design Pattern cainiao series (10) template method pattern modeling and implementation

. println (most people prefer to eat with chopsticks ...);}} class EatBySpoon extends acttemplate {@ Overridepublic void eatWay () {System. out. println (some eat with a spoon ...);}} /*** client Test class ** @ author Leo */public class Test {public static void main (String [] args) {AbstractTemplate at1 = new EatByChopsticks (); at1.eatWay (); abstractTemplate at2 = new EatBySpoon (); at2.eatWay ();}} Ii

Java Design Patterns Rookie series (10) Modeling and implementation of template method pattern

Eatway () {System.out.println ("Most people like to eat with chopsticks ...");}} Class Eatbyspoon extends Abstracttemplate {@Overridepublic void Eatway () {System.out.println ("some eat with a spoon ...");} /** * Client Test class * * @author Leo */public class Test {public static void main (string[] args) {abstracttemplate AT1 = new E Atbychopsticks (); At1.eatway (); Abstracttemplate AT2 = new Eatbyspoon (); A

Python Learning note __10.3 ThreadLocal

In Dictdo_task_1 ()Do_task_2 ()Def do_task_1 (): std = global_dict[threading.current_thread ()] # does not pass in STD, but is found based on the current threaddef do_task_2 ()std = global_dict[threading.current_thread ()] # Any function can find out the STD variable of the current thread3) Way three:ThreadLocalImport threadingLocal_school = threading.local () # Create a global threadlocal objectDef process_student (): std = local_school.student # Gets the current thread-bound variable i

Introduction to Linux common commands

the InternetWget-c URLWhere-c means that the URL for the continuation of the breakpoint represents the routing address of the network resourceSSHLoginSSH [email protected]SSH login remote server host ID is user nameSCPNetwork copy1. Local to server:Sep localpath [email protected]:p at2. Server to Localscp-r [email protected]:p ath LocalPathWhere ID is the server's login name, site is the server address, LocalPath is the address of the local folderVie

The process of explanation

. Process (target=tesk,args=(i,dic))Ten T1.start () One lst.append (t1) A while1:#used to make a judgment. Otherwise, even if the program runs, it doesn't end. -con=0 - forIinchLst:#Here I is the process of each cycle the if notI.is_alive ():#If the process is not present, the instructions have been run, because the child process is not finished, - #If it ends early, it will be an error -Con+=1 - ifCon==len (LST):#know that equality is not stopp

19-python-Processes and Threads

. All threads in the same process share the same block of memory space. 2.1 Thread Call 2.1.1 Direct call1 ImportThreading2 Import Time3 4 5 deffunc (n):6 Print("Task", N)7Time.sleep (2)8 9 Ten #execute with multithreading, print both Task 1 and Task 2, and then wait two seconds for the program to end. OneT1 = Threading. Thread (Target=func, args= ("1",))#generate a thread instance AT2 = Threading. Thread (Target=func, args= ("2",)) -T1.

Apache + Tomcat server Load balancer configuration and tomcat server Load balancer

name in the mod_jk.conf file.Worker. list = dispatcher, status# Define Node1Worker. tomcat1.port = 8019Worker. tomcat1.host = localhostWorker. tomcat1.type = ajp13Worker. tomcat1.lbfactor = 1# Worker. tomcat1.connection _ pool_size = 10# Worker. worker at1.connection _ pool_timeout = 600# Worker. worker at1.socket _ connect_timeout = 300# Define Node2Worker. tomcat2.port = 8029Worker. tomcat2.host = localhostWorker. tomcat2.type = ajp13Worker. tomcat2.lbfactor = 1# Worker. tomcat2.connection _

Mathematics (1. Fermat theorem 2. Extended Euclidean algorithm 3. Momo inversion)

Fermat theorem (Fermat theory) is an important theorem in number theory: if P is prime, and gcd (a,p) = 1, then a(p-1) ≡1 (mod p). That is: If A is an integer, p is a prime number, and A,p coprime (that is, there is only one convention of 1), then the remainder of a (p-1) divided by P is constant equal to 1. The extended Euclidean algorithm is used to solve a set of X, y in known a, b to satisfy the Bézout equation: ax+by = gcd (A, B) =d (the solution must exist, according to the correlation the

[Linux]linux command to learn-netstat

Linux Many services are related to the network, when the service is not available or the start port is occupied, or is blocked by the firewall, you need to query the network-related problems, netstat command will only use one or two parameters here, a good study. A few common options: -A (All) displays all options and does not show listen related by default -T (TCP) displays only TCP-related options -U (UDP) displays only UDP-related options -N refuses to display aliase

Analysis of exists and in

Exists and in are doing the same thing. Why do we need to solve two problems? in fact, they are efficiency problems. For example, the following two examples 1. select * fromt1whereexists (selectXfromt2wheret1. at2.a) PS: replace 'x with any other regular bright characters, such as the number character "etc. 2. select * fromt1wheret1. ai Exists and in are doing the same thing. Why do we need to solve two problems? in fact, they are efficiency problems

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