+perl4caml_hv_empty (value unit)
+{
+ CAMLparam1 (unit);
+ HV *hv = newHV ();
+ CAMLreturn (Val_hv (hv));
+}
+
+CAMLprim value
+perl4caml_hv_set (value hvv, value key, value svv)
+{
+ CAMLparam3 (hvv, key, svv);
+ HV *hv = Hv_val (hvv);
+ SV *sv = Sv_val (svv);
+ SvREFCNT_inc (sv);
+ if (hv_store (hv, String_val (key), caml_string_length (key), sv, 0) == 0)
+ SvREFCNT_dec (sv);
+ CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_hv_get (value hvv, value key)
+{
+ CAMLparam2 (hvv, key);
+ HV *hv = Hv_val (hvv);
+ SV **svp = hv_fetch (hv, String_val (key), caml_string_length (key), 0);
+ if (svp == 0) caml_raise_not_found ();
+ /* Increment the reference count because we're creating another
+ * value pointing at the referenced SV.
+ */
+ SvREFCNT_inc (*svp);
+ CAMLreturn (Val_sv (*svp));
+}
+
+CAMLprim value
+perl4caml_hv_exists (value hvv, value key)
+{
+ CAMLparam2 (hvv, key);
+ HV *hv = Hv_val (hvv);
+ bool r = hv_exists (hv, String_val (key), caml_string_length (key));
+ CAMLreturn (r ? Val_true : Val_false);
+}
+
+CAMLprim value
+perl4caml_hv_delete (value hvv, value key)
+{
+ CAMLparam2 (hvv, key);
+ HV *hv = Hv_val (hvv);
+ hv_delete (hv, String_val (key), caml_string_length (key), G_DISCARD);
+ CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_hv_clear (value hvv)
+{
+ CAMLparam1 (hvv);
+ HV *hv = Hv_val (hvv);
+ hv_clear (hv);
+ CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_hv_undef (value hvv)
+{
+ CAMLparam1 (hvv);
+ HV *hv = Hv_val (hvv);
+ hv_undef (hv);
+ CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_hv_iterinit (value hvv)
+{
+ CAMLparam1 (hvv);
+ HV *hv = Hv_val (hvv);
+ int i = hv_iterinit (hv);
+ CAMLreturn (caml_copy_int32 (i));
+}
+
+CAMLprim value
+perl4caml_hv_iternext (value hvv)
+{
+ CAMLparam1 (hvv);
+ CAMLlocal1 (hev);
+ HV *hv = Hv_val (hvv);
+ HE *he = hv_iternext (hv);
+ if (he == NULL) caml_raise_not_found ();
+ hev = Val_he (he);
+ CAMLreturn (hev);
+}
+
+CAMLprim value
+perl4caml_hv_iterkey (value hev)
+{
+ CAMLparam1 (hev);
+ CAMLlocal1 (strv);
+ HE *he = He_val (hev);
+ I32 len;
+ char *str = hv_iterkey (he, &len);
+ strv = caml_alloc_string (len);
+ memcpy (String_val (strv), str, len);
+ CAMLreturn (strv);
+}
+
+CAMLprim value
+perl4caml_hv_iterval (value hvv, value hev)
+{
+ CAMLparam2 (hvv, hev);
+ CAMLlocal1 (svv);
+ HV *hv = Hv_val (hvv);
+ HE *he = He_val (hev);
+ SV *sv = hv_iterval (hv, he);
+ SvREFCNT_inc (sv);
+ svv = Val_sv (sv);
+ CAMLreturn (svv);
+}
+
+CAMLprim value
+perl4caml_hv_iternextsv (value hvv)
+{
+ CAMLparam1 (hvv);
+ CAMLlocal3 (strv, svv, rv);
+ HV *hv = Hv_val (hvv);
+ char *str; I32 len;
+ SV *sv = hv_iternextsv (hv, &str, &len);
+ if (sv == NULL) caml_raise_not_found ();
+ SvREFCNT_inc (sv);
+ svv = Val_sv (sv);
+ strv = caml_alloc_string (len);
+ memcpy (String_val (strv), str, len);
+ /* Construct a tuple (strv, svv). */
+ rv = caml_alloc_tuple (2);
+ Field (rv, 0) = strv;
+ Field (rv, 1) = svv;
+ CAMLreturn (rv);
+}
+
+CAMLprim value