除了structure alignment 外
還有stack frame alignment
http://stackoverflow.com/questions/8004458/compiler-g-seems-to-allocate-more-memory-for-instances-of-classes-than-it-ne
不過有篇post也討論為啥要在32bit上也要用16 byte
不過他好像沒討論出什麼!?
http://blogs.embarcadero.com/abauer/2010/01/14/38904
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