Cocos2dx template container is simple to use (Vector, Map, Value)

Prior to cocos2dxv3.0beta, there were sequential containers cocos2d: CCArray, and cocos2d: CCDictionary. However, after the new version, both containers will be replaced by cocos2d: VectorT and cocos2d: MAPKs and V. 1. cocos2d: VectorTcocos2d: VectorT is an ordered container that encapsulates an array of dynamic sizes. Its element is

Prior to cocos2dxv3.0beta, there were sequential containers cocos2d: CCArray, and cocos2d: CCDictionary. However, after the new version, both containers will be replaced by cocos2d: VectorT and cocos2d: MAPKs and V. 1. cocos2d: VectorT cocos2d: VectorT is an ordered container that encapsulates an array of dynamic sizes. Its element is

Prior to cocos2dxv3.0beta, there were sequential containers cocos2d: CCArray, and cocos2d: CCDictionary. However, after the new version, both containers will be cocos2d: Vector And cocos2d: Map .

1. cocos2d: Vector

Cocos2d: Vector Is an ordered container that encapsulates an array of dynamic sizes.
Its elements are continuously stored, cocos2d: Vector Is automatically processed. Its internal data structure implementation is actually the STL standard sequence container std: vector.

Remember that T must be a pointer to a cocos2d: Object subclass Object. It cannot be another data type or native type, because the Cocos2d-x's memory management model has been integrated into cocos2d: Vector Starting from v3.0 beta ). You don't have to worry about memory management when using Vector. The class has already been done for you.

Easy to use:

// Create a Vector with the default size And then add an genie to it.

Auto sp0 = Sprite: create ();

Vec0-> pushBack (sp0 );

// Initialize a vector with a capacity

Auto sp1 = Sprite: create ();

Vector Vec1 (5 );

Vec1.insert (0, sp1 );

This container is equivalent to a variable-size container used to save the cocos2d: object pointer object. To save the basic type, you can use std: vector or the simplest array. For more information, see the http://www.cocoachina.com/bbs/read.php? Tid = 199793

2. cocos2d: Map

Cocos2d: Map Is an associated container template that uses std: unordered_map internally.
Std: unordered_map is an associated container consisting of key-value pairs. It allows you to quickly search individual elements based on keys.

In unordered_map, key value is generally used to identify a unique element, while mapped value is an object, and its content is associated with the key value. Internally, the unordered_map elements do not depend on the key or mapped value to sort in any specific way, but depend on their hash values, this allows you to quickly access a single element using their key values (using average time complexity ).

Each element of the K-key value type unordered_map is uniquely identified by its key value.

The V-mapped value type. T must be a pointer to a cocos2d: Object subclass Object. It cannot be another data type or native type, because we have integrated the Cocos2d-x's memory management model into cocos2d: Map .

The value of K can be of another type, but the value of V must be a pointer to a cocos2d: Object subclass Object.

Easy to use

// Create a Map with the default size And then add an genie to it.

Auto sp0 = Sprite: create ();

Sp0-> setTag (0 );

Map Map0;

Std: string mapKey0 = "MAP_KEY_0 ";

Map0.insert (mapKey0, sp0 );

Map Is a key-value container. To save the value of the basic type, you can use std: map Or std: unordered_map . See http://www.cocoachina.com/bbs/read.php for details? Tid = 199916

3. cocos2d: Value

Cocos2d: Value is a native type that contains many types (int, float, double, bool, unsigned char, char *, and std: string) plus std: vector , Std: unordered_map And std: unordered_map .
You can put all the native types mentioned above into the cocos2d: Value object, convert them to the corresponding native type, and vice versa.
Some native encapsulation classes such as CCBool, CCFloat, CCDouble, and CCinteger exist before Cocos2d-x v3.0 beta, which will be discarded.
Note: When processing native types and containers, use cocos2d: Vector , Cocos2d: Map And cocos2d: Value.

The Value does not manage the memory with the Vector or Map itself. cocos2d: the memory of the Value is automatically processed by its own destructor. Therefore, when processing the cocos2d: Value memory, stick to the best practices with c ++ memory management rules.

Easy to use

Value val1 (65); // initialize with an int

// Value val1 (3.4f); // use a float for initialization

// Value val1 (3.5); // initialize with a double

Log ("val1.asByte () = % d", val1.asInt (); // read int data

The Cocos2d: Value class is not a subclass of cocos2d: Object, so cocos2d: Vector or cocos2d: Map cannot be used. It is only one cocos that can contain other numeric types. For details, see Http://www.cocoachina.com/bbs/read.php? Tid = 200034

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