Error c2572 redefinition of default parameters

To save trouble, copy and paste the function after it is declared, and error c2572 is displayed.RedefinitionDefault parameters

As the name suggests, this default parameter is defined multiple times. In a file (or a scope), you can only specify the default value for the form parameter.

When a real parameter is compiled, the header file is combined with the source file, and the default parameter is specified multiple times.

Therefore, we only need to declare this default parameter once in the header file or the source file, so we are used to declaring this parameter in the header file.

Note: This error is only caused by compilation system problems. Some compilation systems will not report this error!