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new function mrb_obj_iv_ifnone()

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This commit is contained in:
Yukihiro Matz Matsumoto
2012-12-12 18:22:23 +09:00
parent 2a5d82885a
commit f63d5c2905
2 changed files with 16 additions and 0 deletions
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include/mruby/variable.h
+1
View File
@@ -41,6 +41,7 @@ int mrb_const_defined(mrb_state*, mrb_value, mrb_sym);
mrb_value mrb_obj_iv_get(mrb_state *mrb, struct RObject *obj, mrb_sym sym);
void mrb_obj_iv_set(mrb_state *mrb, struct RObject *obj, mrb_sym sym, mrb_value v);
int mrb_obj_iv_defined(mrb_state *mrb, struct RObject *obj, mrb_sym sym);
void mrb_obj_iv_ifnone(mrb_state *mrb, struct RObject *obj, mrb_sym sym, mrb_value v);
mrb_value mrb_iv_get(mrb_state *mrb, mrb_value obj, mrb_sym sym);
void mrb_iv_set(mrb_state *mrb, mrb_value obj, mrb_sym sym, mrb_value v);
int mrb_iv_defined(mrb_state*, mrb_value, mrb_sym);
src/variable.c
+15
View File
@@ -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)
{