(Command-line option to suppress warning: -w-nvf) 

In C++, a class member function was called for a volatile object of the class type, but the function was not declared with volatile following the function header. Only a volatile member function can be called for a volatile object. 

For example, if you have

  class c
  {
  public:
    f() volatile;
    g();
  };
  volatile c vcvar;

it is legal to call vcvar.f(), but not to call vcvar.g().