2 grob-callback.cc -- implement Callback smob.
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "cxx-function-smob.hh"
11 #include "ly-smobs.icc"
13 static long callback_tag;
22 print_smob (SCM, SCM port, scm_print_state *)
24 scm_puts ("#<encapsulated C++ function>", port);
29 scm_sizet free_smob (SCM)
36 cxx_function_type_p (SCM x)
38 return (SCM_CELL_TYPE(x) == callback_tag) ? SCM_BOOL_T : SCM_BOOL_F;
41 void init_cxx_function_smobs()
43 callback_tag = scm_make_smob_type_mfpe ("callback", 0,
47 scm_make_gsubr ("c++-function?", 1, 0, 0, (Scheme_function_unknown) cxx_function_type_p);
51 smobify_cxx_function (Cxx_function cb)
56 SCM_SETCDR (z, (SCM)cb);
57 SCM_SETCAR (z, (SCM)callback_tag);
64 unsmob_cxx_function (SCM x)
67 if (SCM_NIMP (x) && SCM_CELL_TYPE(x) == callback_tag)
68 return (Cxx_function) SCM_CELL_WORD_1(x);