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Suppose we have different objects to manage, we may create a class to wrap it to manage these different types of objects, such Class cobjmanager { Public: Bool addobj_a (string const strobjname, other_params ...); Bool addobj_ B (string const strobjname, other_params ...); ....... Bool updateallobj (); } Use the Add function to add the object to the manager. Then, when updating the object, use updateallob

of the structure of the array, and you want to have the function name and menu item command name has an intuitive, name relationship. Then the following code is very useful:struct command{char * name;void (*function) (void);};#define COMMAND (name) {name, name # # _command}Then you can easily initialize an array of command structures with some pre-defined commands:struct command commands[] = {COMMAND (quit),COMMAND (Help),...}The command macro acts as a code generator here, which reduces the co

As the database data volume continues to grow, some tables need to be converted from normal heap tables to partition tables. There are several different methods for this operation, such as exporting table data. As the database data volume continues to grow, some tables need to be converted from normal heap tables to partition tables. There are several different methods for this operation, such as exporting table data. As the database data volume continues to grow, some tables need to be con

Previously, the jdk of ubuntu was installed with the apt-get install command. The default installation is openjdk, and the path is/usr/lib/jvm /. If you need to switch or upgrade the java version, you can use update-alternatives. Of course, you can uninstall and reinstall it, or you can install it by setting environment variables. This section describes how to install update-alternatives.Since the developme

As the database data volume continues to grow, some tables need to be converted from normal heap tables to partition tables. There are several different methods for this operation, such as exporting table data, creating a partition table, and then importing data to the partition table; use the exchange partition method to convert to a PARTITION table and use DBMS_REDEFINITION to redefine a PARTITION table o

Use UIScrollView to switch between several pages. This example shows how to use UIScrollView and the table and page Jump content; Original Author address: http://www.cocoachina.com/bbs/read.php? Tid = 323514 As follows: 1: use of the knowledge point rolling View # Import "YCView. h "@ interface ViewController () 2:

The solution of Insus. NET is to use the factory method for processing. You can create a factory interface and design each method as a factory class to implement the factory interface.Factory Interface:Copy codeThe Code is as follows:IGetFactoryUsing System;Using System. Collections. Generic;Using System. Linq;Using System. Web;/// /// Summary description for IGetFactory/// Namespace Insus. NET{Public interface IGetFactory{String GetResult ();}} Get F

The solution of Insus. NET is to use the factory method for processing. You can create a factory interface and design each method as a factory class to implement the factory interface. Factory Interface: Copy codeThe Code is as follows: IGetFactory Using System; Using System. Collections. Generic; Using System. Linq; Using System. Web; /// /// Summary description for IGetFactory /// Namespace Insus. NET { Public interface IGetFactory { String GetResu

I've long heard that virtualenv is one of the essential artifacts of Python, But always feel that the Mac python2.7 is very easy to use, as if there is no need for virtualenv, but today on the GitHub to see a new Python open source project, need to use Python3, so must virtualenv. 1. Install virtualenv, Virtualenvwrapper sudo pip install virtualenv sudo pip install Virtualenvwrapper 2. Install python3.4 mkd

1.for usage Case resolves to for ($i =1; $i 2.switch usage Case You can also use variables for the Value property of the case, for example: Comprehensive case

#include 　　Title: Ask 1+2+...+n, do not use multiplication, for, while, if, else, switch, case, and other keywords and conditional judgment statement (A? B:C)

Method 1: Recursive, using logic and short-circuit characteristics Public class Solution { int sum_solution (int n) { int ans = n; (ans + = sum_solution (n-1)) ; return ans; }}Act 2. Calling Java library functions Public class Solution { publicint sum_solution (int n) { int Sum = ( C10>int) (Math.pow (n,2) + n); return sum>>1;} }Ask for 1+2+3+...+n, the request cannot use multiplication method, for, w

", rate: "76 "}, {Week: "Friday", month: "May", person: "6355", rate: "49 "}, {Week: "Saturday", month: "June", person: "4356", rate: "32 "}, {Week: "Sunday", month: "July", person: "9087", rate: "87 "} ]); /** * Initialization Function */ Protected function inithandler (Event: flexevent): void { } /** * Query button Functions */ Protected function search_clickhandler (Event: mouseevent): void { } /** * Single-choice button switching function */ Protected function r

Moinmoin1.8.3 is finally installed. Write down the steps for future use. Since apache2, Python, and moinmoin are not understood, they are all rigid steps: 1. Open the terminal and switch to the administrator privilege. Sudo-I 2. Install apache2 Apt-Get install apache2 3. Download moinmoin1.8.3 Official Website 4. Decompress moinmoin 1.8.3 tar.gz to a directory where/opt/moinmoin-1.8.3 is used. See the/opt/m

Use the scrolling Effect of uiscrollview. First: The implementation process is as follows: add uiscrollview and uipagecontrol to viewcontroller: -(void) loadView { [super loadView]; UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320,480)]; UIPageControl* pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 438, 320, 42)]; self.scrollView = scrollView; self.pageControl = pageControl; se

2018.7.2 How to use JS implementation click the picture to switch to another picture, click again to restore to the original picture

When working in a Linux/unix environment, the most common way to log on to a remote host is to use SSH for remote logins, but sometimes we need to switch between two or more host terminals frequently, so it is cumbersome to provide a password each time. In fact, you can not completely from the SSH exit, directly suspend the current job can be, the specific way is to type the symbol "~", and then the shortcu

In Flex, use single-choice buttons to switch the horizontal and vertical coordinates and descriptions of the column chart, and use the flex column chart. 1. Problem Description A group of single-choice buttons can be divided into weeks and months. Select "Week". The horizontal coordinate of the bar chart shows the Week, and the vertical coordinate shows the numbe

VLAN in the initial design of the network can bring great benefits to the future expansion of the network. In ordinary small enterprises, the use of routers to divide VLAN is a cost-saving method, but in large and medium-sized enterprises, the use of routers to divide the VLAN will seriously affect the performance of the enterprise network, and the communication between VLANs must be routed to achieve, th

, according to the need to select the string to send, that is, as needed to specify the command you want to input on the switch. Of course there are not only backups, like the Reload/switchport mode trunk can be done.4, as to how to build an FTP server, how to use expect more deeply, please Baidu or Google yourself.The next thing we do is create a crontab to automate the task[Email protected] ~]# CRONTAB-E*