From c1d9bbc3453454aceb28f51e72e4aeb8ef1c12eb Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky
Date: Thu, 30 Jan 2014 04:37:19 +0200
Subject: Implement __bool__ and __len__ via unary_op virtual method for all
 types.

__bool__() and __len__() are just the same as __neg__() or __invert__(),
and require efficient dispatching implementation (not requiring search/lookup).
type->unary_op() is just the right choice for this short of adding
standalone virtual method(s) to already big mp_obj_type_t structure.
---
 py/objtuple.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'py/objtuple.c')

diff --git a/py/objtuple.c b/py/objtuple.c
index 754fe4b66..5f1744ea3 100644
--- a/py/objtuple.c
+++ b/py/objtuple.c
@@ -76,7 +76,8 @@ static mp_obj_t tuple_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const m
 static mp_obj_t tuple_unary_op(int op, mp_obj_t self_in) {
     mp_obj_tuple_t *self = self_in;
     switch (op) {
-        case RT_UNARY_OP_NOT: if (self->len == 0) { return mp_const_true; } else { return mp_const_false; }
+        case RT_UNARY_OP_BOOL: return MP_BOOL(self->len != 0);
+        case RT_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->len);
         default: return MP_OBJ_NULL; // op not supported for None
     }
 }
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