本文探讨了对象初始化过程中的默认成员初始化流程，包括基类构造函数调用及递归特性。此外，还介绍了位级复制语义的概念，即如何通过原始内存复制的方式实现对象的复制。
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Default Memberwist Initialization: During initialize an object, base class's constructor(s) is(are) called, data members' are called, this constructor is called.
Of course, this is a recursive procedure.
Bitwise copy semantics: raw memory copy. For example, given object a of Class A occupies 10 bytes memory from address 0x0 to 0x9,
b = a will copy data from 0x0 to 0x9 to b's memory space if Bitwise copy semantics applies.
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