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-rw-r--r--libguile/numbers.h15
1 files changed, 14 insertions, 1 deletions
diff --git a/libguile/numbers.h b/libguile/numbers.h
index cef2b863b..3c43ae421 100644
--- a/libguile/numbers.h
+++ b/libguile/numbers.h
@@ -3,7 +3,8 @@
#ifndef SCM_NUMBERS_H
#define SCM_NUMBERS_H
-/* Copyright (C) 1995,1996,1998,2000,2001,2002,2003,2004,2005, 2006, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1998,2000,2001,2002,2003,2004,2005, 2006,
+ * 2008, 2009, 2010, 2011, 2013 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@@ -500,6 +501,18 @@ SCM_API SCM scm_from_mpz (mpz_t rop);
#endif
#endif
+#if SCM_SIZEOF_SCM_T_PTRDIFF == 4
+#define scm_to_ptrdiff_t scm_to_int32
+#define scm_from_ptrdiff_t scm_from_int32
+#else
+#if SCM_SIZEOF_SCM_T_PTRDIFF == 8
+#define scm_to_ptrdiff_t scm_to_int64
+#define scm_from_ptrdiff_t scm_from_int64
+#else
+#error sizeof(scm_t_ptrdiff) is not 4 or 8.
+#endif
+#endif
+
/* conversion functions for double */
SCM_API int scm_is_real (SCM val);