Tutorial by Examples: ces

If you want to parse more complex command-line arguments, e.g. with optional parameters, than the best is to use google's GWT approach. All classes are public available at: https://gwt.googlesource.com/gwt/+/2.8.0-beta1/dev/core/src/com/google/gwt/util/tools/ToolBase.java An example for handling ...

If the underlying type is not explicitly specified for an unscoped enumeration type, it is determined in an implementation-defined manner. enum E { RED, GREEN, BLUE, }; using T = std::underlying_type<E>::type; // implementation-defined However, the standard does require th...

This topic explains the concept of an object reference; it is targeted at people who are new to programming in Java. You should already be familiar with some terms and meanings: class definition, main method, object instance, and the calling of methods "on" an object, and passing parameter...

The Java language allows you to use new to create instances Integer, Boolean and so on, but it is generally a bad idea. It is better to either use autoboxing (Java 5 and later) or the valueOf method. Integer i1 = new Integer(1); // BAD Integer i2 = 2; // BEST (autoboxing)...

Once we have Odoo installed, we need to create a server instance. A server instance is an Odoo service listening on a specific port, 8060, by default, and using a database to store data. The minimal command to start an Odoo instance using the mydb database: $ ./odoo.py -d mydb If the database ...

PHP has built in function pcntl_fork for creating child process. pcntl_fork is same as fork in unix. It does not take in any parameters and returns integer which can be used to differentiate between parent and child process. Consider the following code for explanation <?php // $pid is the P...

Interprocess communication allows programmers to communicate between different processes. For example let us consider we need to write an PHP application that can run bash commands and print the output. We will be using proc_open , which will execute the command and return a resource that we can com...

Stop the MySQL (mysqld) server/daemon process. Start the MySQL server process the --skip-grant-tables option so that it will not prompt for a password: mysqld_safe --skip-grant-tables & Connect to the MySQL server as the root user: mysql -u root Change password: (5.7.6 and newer): ALT...

To check which process running on port 8080 lsof -i :8080

ps -e | less ps -e shows all the processes, its output is connected to the input of more via |, less paginates the results.

ps aux | grep <search-term> shows processes matching search-term Example: root@server7:~# ps aux | grep nginx root 315 0.0 0.3 144392 1020 ? Ss May28 0:00 nginx: master process /usr/sbin/nginx www-data 5647 0.0 1.1 145124 3048 ? S Jul18 2:53 nginx: worke...

One of the core benefits of Typescript is that it enforces data types of values that you are passing around your code to help prevent mistakes. Let's say you're making a pet dating application. You have this simple function that checks if two pets are compatible with each other... checkCompatible...

If we know the desired URI of the document we are looking for: fn:doc("/stuff/mysimpledocument.xml") Returns the full document from the database, using the URI to locate it. Since this is XQuery, we can use XPath to find the document when we know about the structure, but not the URI: ...

Java applets are able to load different resources. But since they are running in the web browser of the client you need to make sure that these resources are accessible. Applets are not able to access client resources as the local file system. If you want to load resources from the same URL the App...

Common Lisp does not have interfaces in the sense that some languages (e.g., Java) do, and there is less need for that type of interface given that Common Lisp supports multiple inheritance and generic functions. However, the same type of patterns can be realized easily using mixin classes. This e...

In C#, an array name and a pointer to a data type same as the array data, are not the same variable type. For example, int *p and int[] p, are not same type. You can increment the pointer variable p because it is not fixed in memory but an array address is fixed in memory, and you can't increment th...

This example demonstrates how pointers can be used for C-like access to C# arrays. unsafe { var buffer = new int[1024]; fixed (int* p = &buffer[0]) { for (var i = 0; i < buffer.Length; i++) { *(p + i) = i; } } } The unsafe keyw...

C# inherits from C and C++ the usage of the symbol -> as a means of accessing the members of an instance through a typed pointer. Consider the following struct: struct Vector2 { public int X; public int Y; } This is an example of the usage of -> to access its members: Vector2...

In .NET, the GC allocates objects when there are no references left to them. Therefore, while an object can still be reached from code (there is a strong reference to it), the GC will not allocate this object. This can become a problem if there are a lot of large objects. A weak reference is a ref...

To add a language to Sublime Text, you use Package Control. You can do this by pasting the correct Python code (available on the Package Control site linked above), or by downloading the .sublime-package file (also available for download on the site). Once you set up Package Control, restart Sublime...