How delete box2d world

cocos2d-x C++
#1

We use “b2World* world = new b2World(gravity, doSleep);” to create box2d world, but I haven’t known how to destroy box2d world. Could anyone help me? It will cause a error if I use “delete world”.

#2 
CC_SAFE_DELETE(world);

check Box2dTest.cpp in cpp tests.

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