From 9879965407d8e65c6ad920b9fb913ece0c464edb Mon Sep 17 00:00:00 2001
From: Andrey Breslav <andrey.breslav@jetbrains.com>
Date: Tue, 19 Nov 2013 14:54:33 +0400
Subject: [PATCH] Library functions

---
 .../org/jetbrains/jet/utils/collections.kt    | 27 +++++++++++++++++++
 .../src/org/jetbrains/jet/utils/coreLib.kt    |  8 +++++-
 2 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 core/util.runtime/src/org/jetbrains/jet/utils/collections.kt

diff --git a/core/util.runtime/src/org/jetbrains/jet/utils/collections.kt b/core/util.runtime/src/org/jetbrains/jet/utils/collections.kt
new file mode 100644
index 00000000000..199d3fb575a
--- /dev/null
+++ b/core/util.runtime/src/org/jetbrains/jet/utils/collections.kt
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2013 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.utils
+
+import java.util.LinkedHashMap
+
+public fun <K, V> Iterable<V>.toMap(key: (V) -> K): Map<K, V> {
+    val map = LinkedHashMap<K, V>()
+    for (v in this) {
+        map[key(v)] = v
+    }
+    return map
+}
\ No newline at end of file
diff --git a/core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt b/core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt
index 5a4922cabc3..bc32962de5c 100644
--- a/core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt
+++ b/core/util.runtime/src/org/jetbrains/jet/utils/coreLib.kt
@@ -21,4 +21,10 @@ fun Boolean.iif<T>(then: T, _else: T): T = if (this) then else _else
 // These two functions are needed in conjunction with iif:
 // foo.eq(bar).iif(a, b)
 fun <T> T.eq(eq: T): Boolean = this == eq
-fun <T> T.neq(eq: T): Boolean = this != eq
\ No newline at end of file
+fun <T> T.neq(eq: T): Boolean = this != eq
+
+fun <T: Any> T?.sure(message: String): T {
+    if (this == null)
+        throw AssertionError(message)
+    return this
+}
\ No newline at end of file