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 #ifndef __GUILE_IRRLICHT_WRAPPED_H_INCLUDED__
  23 #define __GUILE_IRRLICHT_WRAPPED_H_INCLUDED__
  24
  25 #include <libguile.h>
  26
  27 #define DECLARE_WRAPPED_TYPE(TYPE, INIT, PRED, WRAP, UNWRAP)            \
  28   void                                                                  \
  29   INIT (void);                                                          \
  30                                                                         \
  31   SCM                                                                   \
  32   WRAP (TYPE foreign_obj);                                              \
  33                                                                         \
  34   TYPE                                                                  \
  35   UNWRAP (SCM wrapped_obj);                                             \
  36                                                                         \
  37   bool                                                                  \
  38   PRED (SCM wrapped_obj);
  39
  40
  41 #define DEFINE_WRAPPED_TYPE(TYPE, PRINT_NAME, INIT, PRED, WRAP, UNWRAP) \
  42   static SCM wrapped_##INIT;                                            \
  43                                                                         \
  44   void                                                                  \
  45   INIT (void)                                                           \
  46   {                                                                     \
  47     SCM name, slots;                                                    \
  48     scm_t_struct_finalize finalizer;                                    \
  49                                                                         \
  50     name = scm_from_utf8_symbol (PRINT_NAME);                           \
  51     slots = scm_list_1 (scm_from_utf8_symbol ("data"));                 \
  52     finalizer = NULL;                                                   \
  53                                                                         \
  54     wrapped_##INIT =                                                    \
  55       scm_make_foreign_object_type (name, slots, finalizer);            \
  56   }                                                                     \
  57                                                                         \
  58   SCM                                                                   \
  59   WRAP (TYPE foreign_obj)                                               \
  60   {                                                                     \
  61     return scm_make_foreign_object_1 (wrapped_##INIT, foreign_obj);     \
  62   }                                                                     \
  63                                                                         \
  64   TYPE                                                                  \
  65   UNWRAP (SCM wrapped_obj)                                              \
  66   {                                                                     \
  67     scm_assert_foreign_object_type (wrapped_##INIT, wrapped_obj);       \
  68     return (TYPE)scm_foreign_object_ref (wrapped_obj, 0);               \
  69   }                                                                     \
  70                                                                         \
  71   bool                                                                  \
  72   PRED (SCM wrapped_obj)                                                \
  73   {                                                                     \
  74     return SCM_IS_A_P (wrapped_obj, wrapped_##INIT);                    \
  75   }
  76
  77 #endif