meta ot

In the software development process, if we need to re-use an object, if we repeatedly use new to create this object, so that we in memory need to apply for memory space more than once, so that there may be more memory usage, the problem is very serious, However, the meta-mode can solve this problem, the following is a detailed look at how to solve the problem of the meta-mode.One, enjoy

Enjoy meta-mode refers to "using shared technology to effectively support a large number of fine-grained objects"All "use shared technology to effectively support a large number of fine-grained objects" we can understand that when the number of fine-grained objects is too high, the cost of using shared technology can greatly reduce the cost of running1. Structure1.1 Simple-to-enjoy meta-mode structureThis m

Example://Main templatetemplateintN>structfib{enum{Result = fib1>::result + fib2>:: Result};};//fully-Customized versionTemplate structfib1>{ enum{Result =1 };};//fully-Customized versionTemplate structfib0>{ enum{Result =0 };};intMain () {inti = fibTen>:: Result; //std::cout }Main ideasUsing the template special mechanism to implement the compile-time conditional selection structure, the recursive template is used to realize the compile-time loop structure, and the template

It's a struggle to start touching the concept of the meta-class in Python's new class. I don't know what this is.Use the following definitions to illustrate:(1) In Python, the class is also an object. It's just a special kind of object that he uses to create other objects.(2) The Meta-class is also a class, but it is more special ... He is the class used to create other classes ... (hehe, is not very mouthf

metaprogramming is the writing of computer programs This write or manipulate other programs (o R themselves) as their data, or that does part of the work at compile time this would otherwise be don E at runtime . In some cases, this allows programmers to minimize the number of lines of code to express a solution (hence reducing devel Opment time), or it gives programs greater flexibility to efficiently handle new situations without recompilation. Have not contacted

META element As we explained in the previous chapter, the header element contains a summary of information about a document. HTML also contains a META element that is inside the head element. The function of a META element is to provide meta information for a document. In most cases,

Disable page cache: Meta is an auxiliary tag in the head area of the html language. Maybe you think the code is dispensable. In fact, if you can make good use of the meta tag, it will bring you unexpected results. The meta tag has the following functions: Search Engine Optimization (SEO), defining the language of the page, automatically refresh and refer to

Flyweight in boxing is the most lightweight, that is, "The fly level" or "rainfall level", where the choice to use the "enjoy meta-mode" of the free translation, because it is more reflective of the intention of the model. The enjoy meta mode is the structure mode of the object. The enjoy meta mode efficiently supports a large number of fine-grained objects in a

};while (true){ClassLoader loader = new URLClassLoader(urls);classLoaderList.add(loader);loader.loadClass("com.paddx.test.memory.Test");}} catch (Exception e) {e.printStackTrace();}}} Code Snippet 4The results of the operation are as follows:The JDK version used in this example is 1.7, and the size of the specified PermGen area is 8M. By loading the test class each time a different URLClassLoader object is generated, a different class object is generated so that we can see the familiar "

('foochild', (Foo,), {})2 > >> foochild3 class'__console__. Foochild'>4 >>> foochild.bar5 True>>>defEcho_bar (self): ...Print(Self.bar) ...>>> Foochild = Type ('Foochild', (Foo,), {'Echo_bar': Echo_bar})>>> hasattr (Foo,'Echo_bar') False>>> hasattr (Foochild,'Echo_bar') True>>> My_foo =Foochild ()>>>My_foo.echo_bar () TrueThree, meta-classA meta-class is a "thing" used to create a class. The

OK, I write the progress of the article is not enough to read the progress of the book, a few simple pieces of text will suffice me to nag an article. Today we continue to say the Meta method, which is somewhat similar to the __index __newindex method. 1. Query and update In the previous article we introduced the __index meta method, which concludes that the __index method is used to process fields that

What is a Web meta? Accustomed to using Frontpage2000 and other tools to make Web page designers, can not really answer it! Users who are familiar with HTML syntax will know that meta is actually an auxiliary tag in the HTML language head area. In almost every web page, we can see the HTML code similar to the following: Some people want to say, this piece of code seems dispensable, not much practical effect

The 2 most important parts of the META tag are keywords and description, whose writing can be said to be the most basic job of optimization, but because of the constant changes in Baidu, meta labels have been changing the impact of keyword rankings, The author has been observing the impact of the label on the keyword ranking. Now the general view is that the title of the keyword ranking has a very large im

1. Mode motivationObject-oriented technology solves some of the flexibility or scalability problems, but in many cases you need to increase the number of classes and objects in the system. When the number of objects is too large, it will lead to high operating costs, resulting in performance degradation and so on.The mode of enjoyment was born to solve this kind of problem. The enjoy meta-mode enables the reuse of identical or similar objects through

Use shared technology to effectively support a large number of fine-grained objectsThe change of the sharing mode is the storage cost of the object.Main roles in the enjoy meta-mode:Abstract enjoy meta (Flyweight) Role: This role is a superclass of all the specific classes of the classes that specify the public interfaces that need to be implemented. Operations that need to be Sinotrans can be passed in as

one, meta tags Meta tags are primarily secondary to HTML structure layers. Meta tags play an important role both on the Internet front end and on the mobile side. This is a HTML5 document for language standards. The first group of META tags is more common. It means that it's content is an HTML document, and that

In the Segmentfault see this article, think the collation is very detailed, so reproduced come and share with you.Original address: http://segmentfault.com/blog/ciaocc/1190000002407912 http://www.qianduan.net/meta-tags-list/CiaoccCopyright CIAOCC All, reproduced please specify the copyright.ProfileThe tag provides metadata about the HTML document. The metadata is not displayed on the page, but is readable for the machine. It can be used in browsers (h