src/wrapped.h

   1 /* guile-irrlicht --- GNU Guile bindings for Irrlicht Engine
   2
   3    Copyright (C) 2020 Javier Sancho <jsf@jsancho.org>
   4
   5    This file is part of guile-irrlicht.
   6
   7    guile-irrlicht is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU Lesser General Public License as
   9    published by the Free Software Foundation; either version 3 of the
  10    License, or (at your option) any later version.
  11
  12    guile-irrlicht is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with guile-irrlicht. If not, see
  19    <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include <libguile.h>
  23
  24 #define DECLARE_WRAPPED_TYPE(TYPE, INIT, PRED, WRAP, UNWRAP)            \
  25   void                                                                  \
  26   INIT (void);                                                          \
  27                                                                         \
  28   SCM                                                                   \
  29   WRAP (TYPE foreign_obj);                                              \
  30                                                                         \
  31   TYPE                                                                  \
  32   UNWRAP (SCM wrapped_obj);                                             \
  33                                                                         \
  34   bool                                                                  \
  35   PRED (SCM wrapped_obj);
  36
  37
  38 #define DEFINE_WRAPPED_TYPE(TYPE, PRINT_NAME, INIT, PRED, WRAP, UNWRAP) \
  39   static SCM wrapped_type;                                              \
  40                                                                         \
  41   void                                                                  \
  42   INIT (void)                                                           \
  43   {                                                                     \
  44     SCM name, slots;                                                    \
  45     scm_t_struct_finalize finalizer;                                    \
  46                                                                         \
  47     name = scm_from_utf8_symbol (PRINT_NAME);                           \
  48     slots = scm_list_1 (scm_from_utf8_symbol ("data"));                 \
  49     finalizer = NULL;                                                   \
  50                                                                         \
  51     wrapped_type =                                                      \
  52       scm_make_foreign_object_type (name, slots, finalizer);            \
  53   }                                                                     \
  54                                                                         \
  55   SCM                                                                   \
  56   WRAP (TYPE foreign_obj)                                               \
  57   {                                                                     \
  58     return scm_make_foreign_object_1 (wrapped_type, foreign_obj);       \
  59   }                                                                     \
  60                                                                         \
  61   TYPE                                                                  \
  62   UNWRAP (SCM wrapped_obj)                                              \
  63   {                                                                     \
  64     scm_assert_foreign_object_type (wrapped_type, wrapped_obj);         \
  65     return (TYPE)scm_foreign_object_ref (wrapped_obj, 0);               \
  66   }                                                                     \
  67                                                                         \
  68   bool                                                                  \
  69   PRED (SCM wrapped_obj)                                                \
  70   {                                                                     \
  71     return SCM_IS_A_P (wrapped_obj, wrapped_type);                      \
  72   }