Unity, when to use static classes, when to use a single case

If there are no member variables, or if the member variables are constants, use a static class.

If there is a member variable, use a singleton. (so that the member variable has an initialization opportunity).

Static class

public class cmyfuncs{

public float m_pi=3.1415926;

static float Calculatecirclearea (float r) {

return R*R*M_PI;

}

...

}

Single case

public class Cmyutil {
static private Cmyutil m_instance=null;
Public Cmyobj m_myobj;
static public Cmyutil sharedinstance () {
if (m_instance = = null) {
M_instance=new Cmyutil ();
M_instance.init ();
}
return m_instance;
}
void Init () {
M_myobj.init ();
}

...
}

Unity, when to use static classes, when to use a single case