source file of the Flower Library
- (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
-
#ifndef VIRTUAL_METHODS_HH
#define VIRTUAL_METHODS_HH
#include <typeinfo>
+using namespace std;
-#define classname(class_ptr) demangle_classname (typeid (* (class_ptr)))
+#define classname(class_ptr) demangle_classname (typeid (* (class_ptr)))
-const char *
-demangle_classname (std::type_info const &);
+char const *
+demangle_classname (type_info const &);
-/**
+/*
- Virtual copy constructor. Make up for C++'s lack of a standard
- clone () function. Uses a typeof hack. Usage:
+Virtual copy constructor. Make up for C++'s lack of a standard
+factory or clone () function. Usage:
- class Foo : Baseclass {
- VIRTUAL_COPY_CONS (Baseclass);
- };
-
- */
+class Foo : Baseclass
+{
+VIRTUAL_COPY_CONSTRUCTOR (Baseclass, Foo);
+};
-/*
- fix constness: gcc-2.95 is correct in defining
-
- typeof (*this)
-
- in a const member function to be const
*/
-#define VIRTUAL_COPY_CONS(base) \
- virtual base* clone_const_helper () \
- { \
- return new typeof (*this) (*this); \
- } \
- virtual base* clone () const \
- { \
- base* urg = (base*)this; \
- return urg->clone_const_helper (); \
- }
+#define DECLARE_CLASSNAME(name) \
+ virtual const char *class_name () const { \
+ return #name; \
+}
+
+#define VIRTUAL_COPY_CONSTRUCTOR(Base, name) \
+ DECLARE_CLASSNAME(name);\
+ virtual Base *clone () const \
+ { \
+ return new name (*this); \
+ }
#endif /* VIRTUAL_METHODS_HH */