From d0d77181e3f52f1c3b419d48f052638d069cf7a6 Mon Sep 17 00:00:00 2001
From: Andrey Breslav <andrey.breslav@jetbrains.com>
Date: Tue, 22 Oct 2013 19:01:34 +0400
Subject: [PATCH] ifEmpty for collections

---
 core/util.runtime/src/org/jetbrains/jet/utils/collections.kt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/util.runtime/src/org/jetbrains/jet/utils/collections.kt b/core/util.runtime/src/org/jetbrains/jet/utils/collections.kt
index 301f562946a..fa20409d6f1 100644
--- a/core/util.runtime/src/org/jetbrains/jet/utils/collections.kt
+++ b/core/util.runtime/src/org/jetbrains/jet/utils/collections.kt
@@ -55,4 +55,6 @@ public fun <K, V: Any> Iterator<K>.keysToMapExceptNulls(value: (K) -> V?): Map<K
         }
     }
     return map
-}
\ No newline at end of file
+}
+
+public fun <T, C: Collection<T>> C.ifEmpty(body: () -> C): C = if (isEmpty()) body() else this
\ No newline at end of file