接口的虚函数表

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BREW接口获取虚函数表,有两个相关的宏: GET_PVTBL和AEEGETPVTBL,其定义如下:
 
// returns an 'iname'Vtbl *
#define GET_PVTBL(p,iname)       ((iname*)(void*)p)->pvt


/* macro for retrieving the vtable from an instance of an interface */
#define AEEGETPVTBL(p,iname)  (*((AEEVTBL(iname) **)((void *)p)))