#加载CocoStudio导出的资源的两种方式
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#define perimeter(x, y) 2*x + 2*y volume = perimeter(x, y) * high
#define perimeter(x, y) (2*(x) + 2*(y))
#define map __gnu_cxx::hash_map // in a.cpp // files which include 'a.cpp' will be polluted by map define.
#Basic Component.
##Delegate. Refrence Counting’s cons