autois used for creating local variables.using namespace cocos2d;is used to shorten types.- each chapter has a compilable source code sample to demonstrate concepts.
$ git clone https://github.com/chukong/programmers-guide-samples.git
$ cd programmers-guide-samples
$ git submodule update --init
$ cd libs/cocos2d-x
$ ./download-deps.py
$ cd ../..
$ open proj.ios_mac/Programmers\ Guide.xcodeproj/