Cocos2d-cocos2d: Value instance sharing

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Added in v3.0beta

It is defined in the header file "ccvalue. H" of "cocos2dx_root/Cocos/base. Recommended tutorialsCocos2d-x from scratch video tutorial

Class value;

Cocos2d: value is a number of basic types (INT, float, double, bool, unsigned char, char *, and STD: string) and STD: vector, STD :: the packaging types of unordered_map and STD: unordered_map classes.

You can put the basic classes mentioned above into the cocos2d: value object to convert them to the corresponding type, and vice versa.

Cocos2d: The underlying value uses a unified variable to save any basic type value, which saves more memory. Before the cocos2d-x v3.0beta, the basic type packages such as ccbool, ccfloat, ccdouble, and ccinteger were used, but they will be discarded.

Note: When processing basic types and containers, use cocos2d: vector, cocos2d: map and cocos2d: value.

Memory Management

Cocos2d: the memory of the value is released by its destructor. Therefore, use the recommended best practices when using cocos2d: value.

Cocos2d: value contains the following data members:

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In the code snippet, _ basedata, _ strdata and _ type are released by the compiler and Their destructor, while cocos2d :: value destructor are responsible for releasing pointer members (_ vectordata, _ mapdata and intkeymapdata ).

Note: cocos2d: value cannot use retain/release and refcount memory management like other cocos2d types

Best use

1. cocos2d: Value and the new template container (cocos2d: vector and cocos2d: Map) are better than cocos2d: ccbool, cocos2d: ccfloat, cocos2d: ccdouble, cocos2d: ccstring, cocos2d: ccinteger and old objective-C-style containers (cocos2d: ccarray and cocos2d: ccdictionary ).

2. When you want to use the aggregation of basic types, package the basic types into cocos2d: value, and then combine them with the template container cocos2d: vector and cocos2d: map. Want to know moreMobile Internet tutorialFor more information, log on to the E-mentor Yiyou network.

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Cocos2d-cocos2d: Value instance sharing