cpp浅拷贝和深拷贝
一、浅拷贝
Shallow copy: if the field is a pointer to some object, the address of the pointer is copied rather than its contents. (浅拷贝:数据域是一个指针,只拷指针的地址,而非指针指向的内容)
二、深拷贝
Deep copy: Copy the contents that pointed by the pointer (深拷贝:拷贝指针指向的内容)