// $Header: /cvsroot/sourcenav/src/snavigator/demo/c++_demo/glish/include/Glish/Object.h,v 1.1.1.1 2002/04/18 23:35:27 mdejong Exp $ #ifndef object_h #define object_h // GlishObject is the root of the class hierarchy. GlishObjects know how to // describe themselves. // Line number to associate with newly created objects.. extern int line_num; class ostream; class GlishObject { public: GlishObject() { line = line_num; ref_count = 1; } virtual ~GlishObject() { } int Line() { return line; } // Return the ref count so other classes can do intelligent copying. int RefCount() const { return ref_count; } // Generate a long description of the object to the // given stream. This typically includes descriptions of // subobjects as well as this object. virtual void Describe( ostream& ) const; // Generate a short description of the object to the // given stream. virtual void DescribeSelf( ostream& ) const; // Non-virtual, non-const versions of Describe() and DescribeSelf(). // We add it here so that if when deriving a subclass of GlishObject we // forget the "const" declaration on the Describe/DescribeSelf // member functions, we'll hopefully get a warning message that // we're shadowing a non-virtual function. void Describe( ostream& stream ) { ((const GlishObject*) this)->Describe( stream ); } void DescribeSelf( ostream& stream ) { ((const GlishObject*) this)->DescribeSelf( stream ); } protected: friend inline void Ref( GlishObject* object ); friend inline void Unref( GlishObject* object ); const char* description; int line; int ref_count; }; inline void Ref( GlishObject* object ) { ++object->ref_count; } inline void Unref( GlishObject* object ) { if ( object && --object->ref_count == 0 ) delete object; } #endif /* object_h */
