+/* classes: h_files */
+
+#ifndef SCM_WEAKS_H
+#define SCM_WEAKS_H
+
+/* Copyright (C) 1995,1996,2000,2001, 2003, 2006 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 as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+\f
+
+#include "libguile/__scm.h"
+
+\f
+
+#define SCM_WVECTF_WEAK_KEY 1
+#define SCM_WVECTF_WEAK_VALUE 2
+
+#define SCM_WVECT_WEAK_KEY_P(x) (SCM_I_WVECT_EXTRA(x) & SCM_WVECTF_WEAK_KEY)
+#define SCM_WVECT_WEAK_VALUE_P(x) (SCM_I_WVECT_EXTRA(x) & SCM_WVECTF_WEAK_VALUE)
+
+/* The DELTA field is used by the abstract hash tables. During GC,
+ this field will be set to the number of items that have been
+ dropped. The abstract hash table will then use it to update its
+ item count. DELTA is unsigned.
+*/
+
+#define SCM_I_WVECT_DELTA(x) (SCM_I_WVECT_EXTRA(x) >> 3)
+#define SCM_I_SET_WVECT_DELTA(x,n) (SCM_I_SET_WVECT_EXTRA \
+ ((x), ((SCM_I_WVECT_EXTRA (x) & 7) \
+ | ((n) << 3))))
+
+#define SCM_I_WVECT_TYPE(x) (SCM_I_WVECT_EXTRA(x) & 7)
+#define SCM_I_SET_WVECT_TYPE(x,t) (SCM_I_SET_WVECT_EXTRA \
+ ((x), (SCM_I_WVECT_EXTRA (x) & ~7) | (t)))
+#define SCM_IS_WHVEC(X) (SCM_I_WVECT_TYPE (X) == 1)
+#define SCM_IS_WHVEC_V(X) (SCM_I_WVECT_TYPE (X) == 2)
+#define SCM_IS_WHVEC_B(X) (SCM_I_WVECT_TYPE (X) == 3)
+#define SCM_IS_WHVEC_ANY(X) (SCM_I_WVECT_TYPE (X) != 0)
+
+\f
+
+SCM_API SCM scm_make_weak_vector (SCM k, SCM fill);
+SCM_API SCM scm_weak_vector (SCM l);
+SCM_API SCM scm_weak_vector_p (SCM x);
+SCM_API SCM scm_make_weak_key_alist_vector (SCM k);
+SCM_API SCM scm_make_weak_value_alist_vector (SCM k);
+SCM_API SCM scm_make_doubly_weak_alist_vector (SCM k);
+SCM_API SCM scm_weak_key_alist_vector_p (SCM x);
+SCM_API SCM scm_weak_value_alist_vector_p (SCM x);
+SCM_API SCM scm_doubly_weak_alist_vector_p (SCM x);
+SCM_API SCM scm_init_weaks_builtins (void);
+SCM_API void scm_init_weaks (void);
+
+SCM_API void scm_i_init_weak_vectors_for_gc (void);
+SCM_API void scm_i_mark_weak_vector (SCM w);
+SCM_API int scm_i_mark_weak_vectors_non_weaks (void);
+SCM_API void scm_i_remove_weaks_from_weak_vectors (void);
+
+#endif /* SCM_WEAKS_H */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/