What is the method of initializing constructor in C++ using an initialization list?

6 months ago

2 minutes

In C++, the constructor initialization list is a method to initialize member variables in a constructor. It allows for directly initializing member variables when an object is created, instead of assigning values within the constructor body. The constructor initialization list follows the constructor parameter list with a colon (:) and lists the member variables to be initialized along with their initial values. For example:

class MyClass {
public:
    MyClass(int a, int b) : num1(a), num2(b) {
        // 构造函数体
    }

private:
    int num1;
    int num2;
};

In the example above, the constructor initialization list initializes num1 (a) and num2 (b) respectively, initializing the member variables num1 and num2. This helps improve code execution efficiency and ensures that member variables are correctly initialized.