cocos2dx的模板容器简单使用(Vector,Map,Value)
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
1. cocos2d::Vector
cocos2d::Vector
它的元素是连续存储的,cocos2d::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
简单使用:
//使用默认大小创建一个 Vector
auto sp0 = Sprite::create();
vec0->pushBack(sp0);
//用一个容量初始化一个 vector
auto sp1 = Sprite::create();
Vector
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
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
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
auto sp0 = Sprite::create();
sp0->setTag(0);
Map<:string sprite> map0;
std::string mapKey0 = "MAP_KEY_0";
map0.insert(mapKey0, sp0);
Map
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
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
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
这些都是根据别人修改的,只是为了自己收藏记忆。

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