本文详细解释了C++中对象的浅拷贝与深拷贝的概念。浅拷贝仅复制对象的成员字段值，对于指针成员只复制指针地址而不复制指向的内容，导致两个对象指向同一内存区域。而深拷贝不仅复制成员字段值，还复制动态分配的内存内容。当对象包含动态分配的内存且需要在拷贝过程中也复制这些内存时，必须使用深拷贝。
What is the shallow and deep copying of objects in C++?
A shallow copy of object copies all of the member field values. This works well if the fields are values, and pointer will be copied, but the memory it points to will not be copied. So the objects will point to the same memory. The default copy constructor and assignment operator make shallow copies.
A deep copying will copy all fields, and make copies of dynamically allocated memory pointed to by the fields. You must write a copy constructor yourself.If an object has pointers to dynamically allocated memory, and the dynamically allocated memory needs to be copied when the original object is copied, then a deep copy is required.
A shallow copy of object copies all of the member field values. This works well if the fields are values, and pointer will be copied, but the memory it points to will not be copied. So the objects will point to the same memory. The default copy constructor and assignment operator make shallow copies.
A deep copying will copy all fields, and make copies of dynamically allocated memory pointed to by the fields. You must write a copy constructor yourself.If an object has pointers to dynamically allocated memory, and the dynamically allocated memory needs to be copied when the original object is copied, then a deep copy is required.
扫一扫
383
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
