1>class Base size(8):为Base类添加一个虚函数
1> +---
1> 0 | a
1> 4 | b
1> +---
1>class Derive size(12):虚函数表的内容和父类Base一样
1> +---
1> 0 | +--- (base class Base)
1> 0 | | {vfptr}
1> 4 | | a
1> 8 | | b
1> | +---
1> +---
1>Derive::$vftable@:
1> | &Derive_meta
1> | 0
1> 0 | &Base::BaseFunc1
1> 1 | &Base::BaseFunc2
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