ruby singleton

Ruby implements two mail sending methods, and ruby implements mail sending. In fact, as long as you are willful, you can use telnet to send emails. However, this cat is not so capricious. We should use the KISS Principle to send emails. This blog post only describes how to send emails, but does not involve email receiving. If you have the opportunity to open a separate blog post in the future.

Ruby basic syntax getting started tutorial, ruby basic syntax tutorial Let's write a simple Ruby program. All Ruby file extensions are. rb. Therefore, put the following source code in the test. rb file.Instance #!/usr/bin/ruby -wputs "Hello,

Most Ruby programs, their design, logic, and action, are all centered around objects. The main task of writing a Ruby program is to create objects and then give them the ability to perform actions. Ruby is an OOP language, an object-oriented language in which you perform calculations, data processing, input, and output by creating objects and then letting the ob

First, the conceptSingleton mode is a kind of common software design pattern. In its core structure, there is only one special class that is called a singleton. The singleton mode can ensure that there is only one instance of a class in the system, and the instance is easy to be accessed by the outside world, thus it is convenient to control the number of instances and save system resources.

When we search the singleton mode, we can see a lot of examples, what kind of lazy, a hungry man-style, probably the following: Public classSingleton {Private StaticSingleton instance=NULL; PrivateSingleton () {System.out.println ("Singleton. Init ... "); } Public StaticSingleton getinstance () {if(instance==NULL) {instance=NewSingleton (); } returninstance; } }When we write a main method to t

Single caseand other languages of the singleton production is not much, can be said to be the simplest of a design pattern. But there are a few points to note that a singleton is just one instance of a class.So we're going to try to stop this class from generating other instances, and the constructor is written as private in the general language. But the functions in OC do not have qualifiers, so we need so

1. There are many implementation methods on the Internet, and the stackflow contains various implementation details. Google by yourself, so you don't need to post a URL. I will briefly describe the principle here and give a simple demo to help you understand it. 1 class Singleton(type): 2 def __init__(self, name, bases, dic): 3 print ".... S

Java Singleton mode and java Singleton Mode The Singleton mode is written in many books as follows: public class SingleTon1 {private SingleTon1(){}private static SingleTon1 instance = null;public static SingleTon1 getInstance(){if(instance == null){instance = new SingleTon1();} return instance;}} But it is not written in actual development. Because of a serious p

C + + Primer Learning Notes _24_ class and Data Abstraction (--static) with singleton mode, auto_ptr and singleton mode, const member function, const object, mutable modifierObjective"Example" writes out the five basic principles of object-oriented?Solution: Single Duty principle, open closure principle, dependency inversion principle, interface isolation principle and Richter replacement principleRichter s

Annotations, variable declarations, Array Operations, and Ruby variables in the ruby tutorial I read an article "PHP basic tutorial" on "blog Park" two days ago and introduced PHP. D guago also wrote a "Ruby getting started tutorial" when learning Ruby ". It should be noted that this article is suitable for beginners w

PHP Singleton mode is what php implements Singleton mode, php Mode 1. What is Singleton mode?1. MeaningAs the object creation mode, the singleton mode ensures that a class has only one instance, and the instance is self-instantiated and global to the entire system. It does not create instance copies, but returns a refe

First, the singleton mode is one of the object's creation modes, and it also includes the Factory mode. The three characteristics of the singleton mode:1, there is only one instance of the class2, the class creates the instance itself (creates its own instance object within the class)3, exposing this instance interface to the entire systemThis is probably what it looks like in Java:Class

I. Three implementations of the singleton pattern and their pros and cons Reprinted from http://my.oschina.net/suyewanwan/blog/102525 Singleton mode: The singleton mode means that there is only one instance. The singleton pattern ensures that a class has only one instance, and instantiates itself and provides this ins

Concept:　　JavaThe single case mode is a common design pattern, and the singleton pattern is divided into three kinds: lazy type single case, a hungry man type single case, registration type single case three kinds. There are a few features of the Singleton model:　　 1, the Singleton class can have only one instance.　　2. The S