Home Database Mysql Tutorial cocos2dx的模板容器简单使用(Vector,Map,Value)

cocos2dx的模板容器简单使用(Vector,Map,Value)

Jun 07, 2016 pm 03:19 PM
ma vector use container template Simple

在cocos2dxv3.0beta之前存在顺序性容器cocos2d::CCArray,和cocos2d::CCDictionary。但是在新版本之后这两个容器都将被cocos2d::VectorT和cocos2d::Mapk,V代替。 1. cocos2d::VectorT cocos2d::VectorT是一个封装了动态大小的数组的顺序型容器。 它的元素是

     

在cocos2dxv3.0beta之前存在顺序性容器cocos2d::CCArray,和cocos2d::CCDictionary。但是在新版本之后这两个容器都将被cocos2d::Vector和cocos2d::Map代替。

   1. cocos2d::Vector

     cocos2d::Vector是一个封装了动态大小的数组的顺序型容器。
它的元素是连续存储的,cocos2d::Vector 的存储是自动处理的。其内部的数据结构实现实际上是STL标准的顺序型容器 std::vector。

请记住T 必须是一个指向 cocos2d::Object子类对象的指针。不能是其他数据类型或者原生类型,因为已经将 Cocos2d-x 的内存管理模型集成到cocos2d::Vector 中(从 v3.0 beta 开始)。使用Vector你不用担心内存管理问题,类内部已经帮你处理好了。

 

简单使用:

//使用默认大小创建一个 Vector,然后往其中加入一个精灵

auto sp0 = Sprite::create();

vec0->pushBack(sp0);

 

//用一个容量初始化一个 vector

auto sp1 = Sprite::create();

Vector  vec1(5);

vec1.insert(0, sp1);

 

这个容器就相当于一个可变大小容器,用于保存cocos2d::object指针对象,如果要保存基本类型可以使用std::vector或者最简单的数组.详细请见 http://www.cocoachina.com/bbs/read.php?tid=199793

 

2. cocos2d::Map

cocos2d::Map 是一个内部使用了 std::unordered_map的关联容器模版。
std::unordered_map 是一个存储了由key-value键值对组合成构成的关联性容器,允许基于键对单个元素进行快速检索。

在 unordered_map 中,key value 一般用来标识唯一的一个元素,而 mapped value 是一个对象,其内容关联到对于的 key value。在内部,unordered_map 的元素并不依赖于 key 或者 mapped 值来使用任何的特定方式排序,而是取决于它们的哈希值,以便通过他们的key值快速访问单个元素(使用平均时间复杂度)。

 

K - key value的类型unordered_map 中的每一个元素都由它的 key value 唯一标识。

 

V - mapped value的类型.T 必须是一个指向 cocos2d::Object 子类对象的指针。不能是其他数据类型或者原生类型,因为我们已经将 Cocos2d-x 的内存管理模型集成到 cocos2d::Map 中。

 

K的值可以食其他类型,但是V的值必须是一个指向 cocos2d::Object 子类对象的指针。

 

简单的使用

//使用默认大小创建一个 Map,然后往其中加入一个精灵

auto sp0 = Sprite::create();

sp0->setTag(0);

Map<:string sprite> map0;

std::string mapKey0 = "MAP_KEY_0";

map0.insert(mapKey0, sp0);

 

 

Map是一个key-value的容器。如果想保存基本类型的value,可以使用std::map或者std:: unordered_map.详细见http://www.cocoachina.com/bbs/read.php?tid=199916

 

 

  3. cocos2d::Value

 

cocos2d::Value 是一个包含了很多原生类型(int,float,double,bool,unsigned char,char* 和 std::string)外加 std::vector,std::unordered_map<:string> 和 std::unordered_map 的类。
    你可以把所有上面的提及的原生类型放入 cocos2d::Value 对象中,然后将它们转化为对应的原生类型,反之亦然。
    在 Cocos2d-x v3.0 beta 之前,存在着一些原生类型的封装类,如 CCBool, CCFloat, CCDouble, CCinteger,这些将会被弃用。
注意:当你在处理原生类型和容器的时候,请使用 cocos2d::Vector,cocos2d::Map 和 cocos2d::Value。

Value不与Vector和Map自己内部管理内存,cocos2d::Value 的内存是由它自己的析构函数自动处理的。所以当处理 cocos2d::Value 的内存时请坚持以 c++ 内存管理规则进行最佳实践。

 

简单使用

Value val1(65);  // 用一个int 初始化

//Value val1(3.4f);  // 用一个float 初始化

//Value val1(3.5);  // 用一个double 初始化

log("val1.asByte()= %d",val1.asInt());//读取int数据

 

Cocos2d::Value类不是cocos2d::Object的子类,所以不能使用到cocos2d::Vector或cocos2d::Map,它只是cocos中一个可以包含其他的数值类型。详细见http://www.cocoachina.com/bbs/read.php?tid=200034

 

 

这些都是根据别人修改的,只是为了自己收藏记忆。

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What software is crystaldiskmark? -How to use crystaldiskmark? What software is crystaldiskmark? -How to use crystaldiskmark? Mar 18, 2024 pm 02:58 PM

CrystalDiskMark is a small HDD benchmark tool for hard drives that quickly measures sequential and random read/write speeds. Next, let the editor introduce CrystalDiskMark to you and how to use crystaldiskmark~ 1. Introduction to CrystalDiskMark CrystalDiskMark is a widely used disk performance testing tool used to evaluate the read and write speed and performance of mechanical hard drives and solid-state drives (SSD). Random I/O performance. It is a free Windows application and provides a user-friendly interface and various test modes to evaluate different aspects of hard drive performance and is widely used in hardware reviews

How to download foobar2000? -How to use foobar2000 How to download foobar2000? -How to use foobar2000 Mar 18, 2024 am 10:58 AM

foobar2000 is a software that can listen to music resources at any time. It brings you all kinds of music with lossless sound quality. The enhanced version of the music player allows you to get a more comprehensive and comfortable music experience. Its design concept is to play the advanced audio on the computer The device is transplanted to mobile phones to provide a more convenient and efficient music playback experience. The interface design is simple, clear and easy to use. It adopts a minimalist design style without too many decorations and cumbersome operations to get started quickly. It also supports a variety of skins and Theme, personalize settings according to your own preferences, and create an exclusive music player that supports the playback of multiple audio formats. It also supports the audio gain function to adjust the volume according to your own hearing conditions to avoid hearing damage caused by excessive volume. Next, let me help you

How to use Baidu Netdisk app How to use Baidu Netdisk app Mar 27, 2024 pm 06:46 PM

Cloud storage has become an indispensable part of our daily life and work nowadays. As one of the leading cloud storage services in China, Baidu Netdisk has won the favor of a large number of users with its powerful storage functions, efficient transmission speed and convenient operation experience. And whether you want to back up important files, share information, watch videos online, or listen to music, Baidu Cloud Disk can meet your needs. However, many users may not understand the specific use method of Baidu Netdisk app, so this tutorial will introduce in detail how to use Baidu Netdisk app. Users who are still confused can follow this article to learn more. ! How to use Baidu Cloud Network Disk: 1. Installation First, when downloading and installing Baidu Cloud software, please select the custom installation option.

How to use NetEase Mailbox Master How to use NetEase Mailbox Master Mar 27, 2024 pm 05:32 PM

NetEase Mailbox, as an email address widely used by Chinese netizens, has always won the trust of users with its stable and efficient services. NetEase Mailbox Master is an email software specially created for mobile phone users. It greatly simplifies the process of sending and receiving emails and makes our email processing more convenient. So how to use NetEase Mailbox Master, and what specific functions it has. Below, the editor of this site will give you a detailed introduction, hoping to help you! First, you can search and download the NetEase Mailbox Master app in the mobile app store. Search for "NetEase Mailbox Master" in App Store or Baidu Mobile Assistant, and then follow the prompts to install it. After the download and installation is completed, we open the NetEase email account and log in. The login interface is as shown below

BTCC tutorial: How to bind and use MetaMask wallet on BTCC exchange? BTCC tutorial: How to bind and use MetaMask wallet on BTCC exchange? Apr 26, 2024 am 09:40 AM

MetaMask (also called Little Fox Wallet in Chinese) is a free and well-received encryption wallet software. Currently, BTCC supports binding to the MetaMask wallet. After binding, you can use the MetaMask wallet to quickly log in, store value, buy coins, etc., and you can also get 20 USDT trial bonus for the first time binding. In the BTCCMetaMask wallet tutorial, we will introduce in detail how to register and use MetaMask, and how to bind and use the Little Fox wallet in BTCC. What is MetaMask wallet? With over 30 million users, MetaMask Little Fox Wallet is one of the most popular cryptocurrency wallets today. It is free to use and can be installed on the network as an extension

Teach you how to use the new advanced features of iOS 17.4 'Stolen Device Protection' Teach you how to use the new advanced features of iOS 17.4 'Stolen Device Protection' Mar 10, 2024 pm 04:34 PM

Apple rolled out the iOS 17.4 update on Tuesday, bringing a slew of new features and fixes to iPhones. The update includes new emojis, and EU users will also be able to download them from other app stores. In addition, the update also strengthens the control of iPhone security and introduces more "Stolen Device Protection" setting options to provide users with more choices and protection. "iOS17.3 introduces the "Stolen Device Protection" function for the first time, adding extra security to users' sensitive information. When the user is away from home and other familiar places, this function requires the user to enter biometric information for the first time, and after one hour You must enter information again to access and change certain data, such as changing your Apple ID password or turning off stolen device protection.

What is chirp down? -How to use chirp down What is chirp down? -How to use chirp down Mar 18, 2024 am 11:46 AM

Chirp Down can also be called JJDown. This is a video download tool specially created for Bilibili. However, many friends do not understand this software. Today, let the editor explain to you what Chirp Down is? How to use chirp down. 1. The origin of Chirpdown Chirpdown originated in 2014. It is a very old video downloading software. The interface adopts Win10 tile style, which is simple, beautiful and easy to operate. Chirna is the poster girl of Chirpdown, and the artist is あさひクロイ. Jijidown has always been committed to providing users with the best download experience, constantly updating and optimizing the software, solving various problems and bugs, and adding new functions and features. The function of Chirp Down Chirp Down is

How to use Xiaomi Auto app How to use Xiaomi Auto app Apr 01, 2024 pm 09:19 PM

Xiaomi car software provides remote car control functions, allowing users to remotely control the vehicle through mobile phones or computers, such as opening and closing the vehicle's doors and windows, starting the engine, controlling the vehicle's air conditioner and audio, etc. The following is the use and content of this software, let's learn about it together . Comprehensive list of Xiaomi Auto app functions and usage methods 1. The Xiaomi Auto app was launched on the Apple AppStore on March 25, and can now be downloaded from the app store on Android phones; Car purchase: Learn about the core highlights and technical parameters of Xiaomi Auto, and make an appointment for a test drive. Configure and order your Xiaomi car, and support online processing of car pickup to-do items. 3. Community: Understand Xiaomi Auto brand information, exchange car experience, and share wonderful car life; 4. Car control: The mobile phone is the remote control, remote control, real-time security, easy

See all articles