flower/include/virtual-methods.hh

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef VIRTUAL_METHODS_HH
  21 #define VIRTUAL_METHODS_HH
  22
  23 #include <typeinfo>
  24 using namespace std;
  25
  26 #define classname(class_ptr) demangle_classname (typeid (* (class_ptr)))
  27
  28 char const *
  29 demangle_classname (type_info const &);
  30
  31 /*
  32
  33 Virtual copy constructor.  Make up for C++'s lack of a standard
  34 factory or clone () function.  Usage:
  35
  36 class Foo : Baseclass
  37 {
  38 VIRTUAL_COPY_CONSTRUCTOR (Baseclass, Foo);
  39 };
  40
  41 */
  42
  43 #define DECLARE_CLASSNAME(name) \
  44   virtual const char *class_name () const {     \
  45     return #name; \
  46 }
  47
  48 #define VIRTUAL_COPY_CONSTRUCTOR(Base, name)    \
  49   DECLARE_CLASSNAME(name);\
  50   virtual Base *clone () const                  \
  51   {                                             \
  52     return new name (*this);                    \
  53   }
  54
  55 #endif /* VIRTUAL_METHODS_HH */