Can the constructor of a class in C++ initialize static member variables?

The constructor of a class in C can initialize static member variables. The initialization syntax is as follows: use staticMemberVariable = ...; declaration in the constructor. Static member variables are initialized only once when the constructor is executed for the first time. Static member variables can only be initialized in the constructor, and the reference type must be initialized to nullptr or a valid reference. Static member variables cannot be declared const.

The constructor of a class in C can initialize static member variables

Yes, the constructor of a class in C Static member variables can be initialized.

Syntax for initializing static member variables

To use the constructor to initialize static member variables, you can use the following syntax:

class ClassName {
public:
    ClassName() {
        // 初始化静态成员变量
        staticMemberVariable = ...;
    }

    static int staticMemberVariable;
};

Initialization time

When a class object is created, static member variables will only be initialized once, that is, when any constructor of the class is executed for the first time.

Note

• Static member variables can only be initialized in the constructor, not outside the class or in other member functions.
• If the static member variable is a reference type, it must be initialized to nullptr or a valid reference in the constructor.
• Static member variables cannot be declared as const because their values ​​need to be modified in the constructor.

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