In-place reversing.

#KT-9034
2015-10-30 18:30:25 +03:00
parent 1400bdc09a
commit 4fc54a12b8
7 changed files with 200 additions and 27 deletions
@@ -4143,6 +4143,142 @@ public inline fun ShortArray.takeWhile(predicate: (Short) -> Boolean): List<Shor
    return list
 }

+/**
+ * Reverses elements in the array in-place.
+ */
+public fun <T> Array<out T>.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    val _this = this as Array<T>
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = _this[index]
+        _this[index] = _this[reverseIndex]
+        _this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
+/**
+ * Reverses elements in the array in-place.
+ */
+public fun BooleanArray.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = this[index]
+        this[index] = this[reverseIndex]
+        this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
+/**
+ * Reverses elements in the array in-place.
+ */
+public fun ByteArray.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = this[index]
+        this[index] = this[reverseIndex]
+        this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
+/**
+ * Reverses elements in the array in-place.
+ */
+public fun CharArray.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = this[index]
+        this[index] = this[reverseIndex]
+        this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
+/**
+ * Reverses elements in the array in-place.
+ */
+public fun DoubleArray.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = this[index]
+        this[index] = this[reverseIndex]
+        this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
+/**
+ * Reverses elements in the array in-place.
+ */
+public fun FloatArray.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = this[index]
+        this[index] = this[reverseIndex]
+        this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
+/**
+ * Reverses elements in the array in-place.
+ */
+public fun IntArray.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = this[index]
+        this[index] = this[reverseIndex]
+        this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
+/**
+ * Reverses elements in the array in-place.
+ */
+public fun LongArray.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = this[index]
+        this[index] = this[reverseIndex]
+        this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
+/**
+ * Reverses elements in the array in-place.
+ */
+public fun ShortArray.reverse(): Unit {
+    val midPoint = (size / 2) - 1
+    if (midPoint < 0) return
+    var reverseIndex = lastIndex
+    for (index in 0..midPoint) {
+        val tmp = this[index]
+        this[index] = this[reverseIndex]
+        this[reverseIndex] = tmp
+        reverseIndex--
+    }
+}
+
 /**
 * Returns a list with elements in reversed order.
 */