text: #include <GU_SelectionSet.h>
  A static set of unique selection types. Once created, the set remains immutable. The class also stores the current active selection type for the set. By default, the first group type by group type order will be set as the active selection.
  Definition at line 31 of file GU_SelectionSet.h.
  Construct a new selection set. The mask should contain at least one valid group type for selection. If the mask is invalid and doesn't contain a valid selection group type, a point selection will be chosen by default.
  Create a new selection set from a subset of an existing one.
  Returns the selection handle of the currently active selection type.
  Returns the active selection type for this selection set. This is the selection type that the GUI should consider first for display and manipulation.
  Returns
  true if the set contains the requested selection type.
  Load the selection set from a json stream. Will recycle existing selection objects, if possible, or create new ones if needed.
  Save the selection set to a json stream.
  Returns the selection handle of the given selection type. If the set does not contain the given selection type, an empty selection handle is returned.
  Sets the active selection type for this selection set. If the wanted selection type is not available, this function returns
  false, and the active selection type remains unchanged.
  Returns the entire group mask of selection types. This is the same value that was passed into the constructor.