src/util.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
  23 #define DECLARE_WRAPPED_TYPE(TYPE, INIT, WRAP, UNWRAP)                  \
  24   void                                                                  \
  25   INIT (void);                                                          \
  26                                                                         \
  27   SCM                                                                   \
  28   WRAP (TYPE foreign_obj);                                              \
  29                                                                         \
  30   TYPE                                                                  \
  31   UNWRAP (SCM wrapped_obj);
  32
  33
  34 #define DEFINE_WRAPPED_TYPE(TYPE, PRINT_NAME, INIT, WRAP, UNWRAP)       \
  35   static SCM wrapped_type;                                              \
  36                                                                         \
  37   void                                                                  \
  38   INIT (void)                                                           \
  39   {                                                                     \
  40     SCM name, slots;                                                    \
  41     scm_t_struct_finalize finalizer;                                    \
  42                                                                         \
  43     name = scm_from_utf8_symbol (PRINT_NAME);                           \
  44     slots = scm_list_1 (scm_from_utf8_symbol ("data"));                 \
  45     finalizer = NULL;                                                   \
  46                                                                         \
  47     wrapped_type =                                                      \
  48       scm_make_foreign_object_type (name, slots, finalizer);            \
  49   }                                                                     \
  50                                                                         \
  51   SCM                                                                   \
  52   WRAP (TYPE foreign_obj)                                               \
  53   {                                                                     \
  54     return scm_make_foreign_object_1 (wrapped_type, foreign_obj);       \
  55   }                                                                     \
  56                                                                         \
  57   TYPE                                                                  \
  58   UNWRAP (SCM wrapped_obj)                                              \
  59   {                                                                     \
  60     scm_assert_foreign_object_type (wrapped_type, wrapped_obj);         \
  61     return (TYPE)scm_foreign_object_ref (wrapped_obj, 0);               \
  62   }