Device

 

The class GraphicDevice is a subclass of Device. The superclass Device supplies mainly the instance variable RW_flags defining the device's capabilities for reading, writing or both.

The class Device is defined as follows:

 

#CLASS Device : Root {
  unsigned RW_flags;            /* read/write possible? */
};

The variable RW_flags can hold the following values but the value should only changed by methods on class Device and not by the programmer.

   G_READONLY
   G_WRITEONLY
   G_READWRITE