List of C + + parameter initialization

1. Example: Foo (string s, int i): name (s), id (i) {}; Initialize List
Assigns the value of the string s to name.
2. Default constructor: Constructors with no parameters or parameters with default values
Class (), or class (int age=12,name= "Xiao Ming");
　　

Second, you must use the parameter initialization list case
1. Initializing a reference member
2. Initialize the const variable
3. Initialize a class member without a default constructor, including a base class without a default constructor

List of C + + parameter initialization