From 26eb29547b6e2c5b94ec1bf4b0e90a7821b04be1 Mon Sep 17 00:00:00 2001
From: dearblue <dearblue@users.osdn.me>
Date: Fri, 24 Apr 2020 21:15:34 +0900
Subject: Support `undef` for `mrb_ary_splice()` instead of `[]`

When removing elements from an array, it is possible to avoid creating
an empty array.

Before this patch:

```c
mrb_ary_splice(mrb, ary, head, len, mrb_ary_new(mrb));
```

After this patch:

```c
mrb_ary_splice(mrb, ary, head, len, mrb_undef_value());
```
---
 src/array.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/array.c')

diff --git a/src/array.c b/src/array.c
index 8547cfff4..6e73bcd8e 100644
--- a/src/array.c
+++ b/src/array.c
@@ -732,6 +732,10 @@ mrb_ary_splice(mrb_state *mrb, mrb_value ary, mrb_int head, mrb_int len, mrb_val
       argv = ARY_PTR(r);
     }
   }
+  else if (mrb_undef_p(rpl)) {
+    argc = 0;
+    argv = NULL;
+  }
   else {
     argc = 1;
     argv = &rpl;
-- 
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