flower/include/virtual-methods.hh

   1 /*
   2   virtual-methods.hh -- declare macros for our do-it-yourself RTTI
   3
   4   source file of the Flower Library
   5
   6   (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #ifndef VIRTUAL_METHODS_HH
  10 #define VIRTUAL_METHODS_HH
  11
  12 #include <typeinfo>
  13 using namespace std;
  14
  15 #define classname(class_ptr) demangle_classname (typeid (* (class_ptr)))
  16
  17 char const *
  18 demangle_classname (type_info const &);
  19
  20 /*
  21
  22 Virtual copy constructor.  Make up for C++'s lack of a standard
  23 factory or clone () function.  Usage:
  24
  25 class Foo : Baseclass
  26 {
  27 VIRTUAL_COPY_CONSTRUCTOR (Baseclass, Foo);
  28 };
  29
  30 */
  31
  32 #define DECLARE_CLASSNAME(name) \
  33   virtual const char *class_name () const {     \
  34     return #name; \
  35 }
  36
  37 #define VIRTUAL_COPY_CONSTRUCTOR(Base, name)    \
  38   DECLARE_CLASSNAME(name);\
  39   virtual Base *clone () const                  \
  40   {                                             \
  41     return new name (*this);                    \
  42   }
  43
  44 #endif /* VIRTUAL_METHODS_HH */