We often use it, but sometimes don't pay attention to the program is abnormal, and you still don't know what is going on, some are useful to pay attention to:
1. When the function return value is const, the returned thing is assigned to a type identical indicator;
2. Int defined with const can be used to open an array, but the elements in the constant array of const are not used to define an array.
3. Const Int * i; int * const * i; int * const i; the first two functions are the same, indicating that the content points to the i is unchanged; the last description pointer points to the address constant, but the content varies.
4. The const member function in the class is defined as a CONST after the prototype. Constant functions cannot modify any properties in the class. But there are two ways to modify.
1) {(Yourclass *) this-> member = value;
2) Define a member to Mutable can be modified by a constant function.
5. Constant constants in the class, cannot be used in the class to define an array. ENUM {One = 100; TWO = 2}; defined one, TWO can be. Usually an ENUM defined setup problem: enum a {l = 9, z}; at this time, the value of Z is 10.
