objset: frozensets are hashable.
diff --git a/py/objset.c b/py/objset.c
index 6e303fe..9b70ce6 100644
--- a/py/objset.c
+++ b/py/objset.c
@@ -473,6 +473,22 @@
switch (op) {
case MP_UNARY_OP_BOOL: return MP_BOOL(self->set.used != 0);
case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->set.used);
+#if MICROPY_PY_BUILTINS_FROZENSET
+ case MP_UNARY_OP_HASH:
+ if (MP_OBJ_IS_TYPE(self_in, &mp_type_frozenset)) {
+ // start hash with unique value
+ mp_int_t hash = (mp_int_t)&mp_type_frozenset;
+ mp_uint_t max = self->set.alloc;
+ mp_set_t *set = &self->set;
+
+ for (mp_uint_t i = 0; i < max; i++) {
+ if (MP_SET_SLOT_IS_FILLED(set, i)) {
+ hash += MP_OBJ_SMALL_INT_VALUE(mp_unary_op(MP_UNARY_OP_HASH, set->table[i]));
+ }
+ }
+ return MP_OBJ_NEW_SMALL_INT(hash);
+ }
+#endif
default: return MP_OBJ_NULL; // op not supported
}
}