C2025: Default argument expression can only contain static or global objects or constants

[ERROR]

A local object or non-static class member was used in the expression for a default argument.

  struct A {

  

    int t;

  

    void f(int i=t);  // error

  

  };

  

  void g(int i, int j=i); // error

  

Only use static or global objects or constants in expressions for default arguments.