Add missing unsigned array constructors (from size)

#KT-25961 Fixed

libraries/stdlib/test/collections/UnsignedArraysTest.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package test.collections
+
+import kotlin.test.*
+
+class UnsignedArraysTest {
+
+    @Test
+    fun ubyteArrayInit() {
+        val zeroArray = UByteArray(42)
+        assertEquals(42, zeroArray.size)
+        for (index in zeroArray.indices) {
+            assertEquals(0u, zeroArray[index])
+        }
+
+        val initArray = UByteArray(42) { it.toUByte() }
+        for (index in initArray.indices) {
+            assertEquals(index.toUByte(), initArray[index])
+        }
+    }
+    
+    @Test
+    fun ushortArrayInit() {
+        val zeroArray = UShortArray(42)
+        assertEquals(42, zeroArray.size)
+        for (index in zeroArray.indices) {
+            assertEquals(0u, zeroArray[index])
+        }
+
+        val initArray = UShortArray(42) { it.toUShort() }
+        for (index in initArray.indices) {
+            assertEquals(index.toUShort(), initArray[index])
+        }
+    }
+    
+    @Test
+    fun uintArrayInit() {
+        val zeroArray = UIntArray(42)
+        assertEquals(42, zeroArray.size)
+        for (index in zeroArray.indices) {
+            assertEquals(0u, zeroArray[index])
+        }
+
+        val initArray = UIntArray(42) { it.toUInt() }
+        for (index in initArray.indices) {
+            assertEquals(index.toUInt(), initArray[index])
+        }
+    }
+    
+    @Test
+    fun ulongArrayInit() {
+        val zeroArray = ULongArray(42)
+        assertEquals(42, zeroArray.size)
+        for (index in zeroArray.indices) {
+            assertEquals(0u, zeroArray[index])
+        }
+
+        val initArray = ULongArray(42) { it.toULong() }
+        for (index in initArray.indices) {
+            assertEquals(index.toULong(), initArray[index])
+        }
+    }
+}

libraries/stdlib/unsigned/src/kotlin/UByteArray.kt

@@ -14,6 +14,9 @@ public inline class UByteArray
 @PublishedApi
 internal constructor(private val storage: ByteArray) : Collection<UByte> {
 
+    /** Creates a new array of the specified [size], with all elements initialized to zero. */
+    public constructor(size: Int) : this(ByteArray(size))
+
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
     public operator fun get(index: Int): UByte = storage[index].toUByte()
 

libraries/stdlib/unsigned/src/kotlin/UIntArray.kt

@@ -14,6 +14,9 @@ public inline class UIntArray
 @PublishedApi
 internal constructor(private val storage: IntArray) : Collection<UInt> {
 
+    /** Creates a new array of the specified [size], with all elements initialized to zero. */
+    public constructor(size: Int) : this(IntArray(size))
+
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
     public operator fun get(index: Int): UInt = storage[index].toUInt()
 

libraries/stdlib/unsigned/src/kotlin/ULongArray.kt

@@ -14,6 +14,9 @@ public inline class ULongArray
 @PublishedApi
 internal constructor(private val storage: LongArray) : Collection<ULong> {
 
+    /** Creates a new array of the specified [size], with all elements initialized to zero. */
+    public constructor(size: Int) : this(LongArray(size))
+
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
     public operator fun get(index: Int): ULong = storage[index].toULong()
 

libraries/stdlib/unsigned/src/kotlin/UShortArray.kt

@@ -14,6 +14,9 @@ public inline class UShortArray
 @PublishedApi
 internal constructor(private val storage: ShortArray) : Collection<UShort> {
 
+    /** Creates a new array of the specified [size], with all elements initialized to zero. */
+    public constructor(size: Int) : this(ShortArray(size))
+
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
     public operator fun get(index: Int): UShort = storage[index].toUShort()