Library functions

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
+}

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
+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
+}