What are the cases in C + + that can only be initialized with a list and not assigned?

Original link: http://blog.csdn.net/yuliu0552/article/details/6631509

What are the cases in C + + that can only be initialized with a list and not assigned?

(1) For const and reference type member variables, they can only be initialized and cannot be assigned, so they can only use the initialization list;

Initialization is different from assignment:
Assignment is to delete the original value, give the new value, the constructor means to open space and then assign a value, can only be assigned, not initialized;

Initialization list is not the same, open space and initialization is done at the same time, directly give a value;

Constants cannot be assigned and can only be initialized, so they must be completed in the initialization list;

The C + + reference must also be initialized, so it has to be done in the initialization list.

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1) references must be initialized, pointers unnecessary;

2) The reference initialization cannot be changed, and the pointer can change the object being referred to;

3) There is no reference to a null value, but there is a pointer to a null value.

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In addition, when a subclass initializes itself, if the parent does not have a default constructor, it must also be initialized with the initial session list, and the constructor of the parent class is called in the list table

What are the cases in C + + that can only be initialized with a list and not assigned?