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preface Implementation version of this article: 4.26 See the end for reference Article address https://www.cnblogs.com/shiroe/p/15534304.html concept definition Octree (English: octree) is a tree data structure. Each internal node has exactly eight child nodes. Octree is often used to segment three-dimensional space and recursively subdivi ...

[TOC] Complexity of algorithm Learn how to analyze the complexity of an algorithm. Why algorithm complexity Why do we need to introduce a concept of time complexity? Suppose we allow us to give the complexity of a code segment through running time directly on the server. This method becomes post statistics. What are the drawbacks of this app ...

Bridging mode preface definition advantage shortcoming Application scenario code implementation reference resources Bridging mode preface The code implementation of the bridge mode is very simple, but it is a little difficult to understand, and the application scenarios are relatively limited. Therefore, equivalent to the agent mode, the ...

Annotation and reflection annotation What is annotation Annotation is a new technology introduced in jdk1.5.Function of Annotation: Not the procedure itself, the procedure can be explained;It can be read by other programs, such as compilers. Format of Annotation "@ annotation name" can also take parameters, for example: @Supp ...

RBAC (Role-Based Access Control) means that users are associated with permissions through roles. In short, a user has several roles, and each role has several permissions. In this way, the authorization model of "user role permission" is constructed. In this model, the relationship between users and roles and between roles and permiss ...

1. Why use files Our general data persistence methods include storing data in disk files, databases, etc. Using files, we can store the data directly on the hard disk of the computer, so as to achieve the persistence of the data. 2. What is a document Files on disk are files. But in programming, we generally talk about two kinds of files: pr ...

This article is included in github https://github.com/Michael-lz...MutationObserverMutationObserver is an interface that can listen for DOM structure changes. The MutationObserver is notified of any changes to the DOM object tree.APIMutationObserver is a constructor that accepts a callback parameter and is used to handle node changes. It return ...

introduce The official version of vs2022 was launched yesterday. It is estimated that many people have downloaded and started to create. Net 6. In this section, I will briefly introduce some changes to. Net 6. text The most obvious changes brought by. Net6 this time are: With top-level statements, we can't see Program.Main(). Implicit using in ...

props verification - basic usage: In the previous blog, we mentioned the verification of props, as shown in the figure:   Props verification: for child components, props is foreign (it accepts the parameters passed by the parent component), and it is impossible to guarantee the format of data passed in by the component user. With type ...

Globally unique ID, which aims to make all elements in the distributed system have unique identification information. 1.UUID UUID overview UUID   (universal unique identifier). UUID is calculated and generated based on the current time, counter and hardware identification (usually the MAC address of the wireless network card). Format & ...