Use of const in C + +

In C + +, Const is such a thing: if you want to be able to have something that others cannot modify, then the const will work.

The const is used in the following situations:

A. Modifier constants

const int A;

int const A;

No matter where the const is placed, the effect is actually the same.

b. Modifier pointers:

A const double *p--const is placed before the pointer *, which represents the memory that the current pointer points to is immutable.

A double *const p--const is placed on the pointer *, which represents the current pointer is immutable.

Const Double *const p--The current pointer and the memory that the pointer is pointing to are immutable.

c. modifier parameters

void Funca (const TYPE Value) {}--const modifier parameter, which means that the parameter cannot be changed within the function body.

D. Modifier function return value

The const int fun1 () {}--const modifier function returns a value, then a constint result = FUN1 () is required in the call, and the function is to represent that the return value is immutable.

E. Modifying member functions

Class A

{

void func () const;

The const modifier member function, which means that the function cannot modify a member variable in Class A, for example, if you are just getting a value in a, and you do not want to change it, it is useful for the robustness of the program.

}

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