From f63d5c290510965e1256e4fac77709da83a6719a Mon Sep 17 00:00:00 2001 From: Yukihiro Matz Matsumoto Date: Wed, 12 Dec 2012 18:22:23 +0900 Subject: new function mrb_obj_iv_ifnone() --- src/variable.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'src') diff --git a/src/variable.c b/src/variable.c index 6907a8e2a..992663408 100644 --- a/src/variable.c +++ b/src/variable.c @@ -460,6 +460,21 @@ mrb_obj_iv_set(mrb_state *mrb, struct RObject *obj, mrb_sym sym, mrb_value v) iv_put(mrb, t, sym, v); } +void +mrb_obj_iv_ifnone(mrb_state *mrb, struct RObject *obj, mrb_sym sym, mrb_value v) +{ + iv_tbl *t = obj->iv; + + if (!t) { + t = obj->iv = iv_new(mrb); + } + else if (iv_get(mrb, t, sym, &v)) { + return; + } + mrb_write_barrier(mrb, (struct RBasic*)obj); + iv_put(mrb, t, sym, v); +} + void mrb_iv_set(mrb_state *mrb, mrb_value obj, mrb_sym sym, mrb_value v) { -- cgit v1.2.3