Improve conversion functions for Buffer

kmath-core/api/kmath-core.api

@@ -2314,6 +2314,7 @@ public final class space/kscience/kmath/structures/BufferKt {
 	public static final fun asSequence (Lspace/kscience/kmath/structures/Buffer;)Lkotlin/sequences/Sequence;
 	public static final fun getIndices (Lspace/kscience/kmath/structures/Buffer;)Lkotlin/ranges/IntRange;
 	public static final fun toList (Lspace/kscience/kmath/structures/Buffer;)Ljava/util/List;
+	public static final fun toMutableList (Lspace/kscience/kmath/structures/Buffer;)Ljava/util/List;
 }
 
 public abstract interface class space/kscience/kmath/structures/FlaggedBuffer : space/kscience/kmath/structures/Buffer {
@@ -2376,7 +2377,7 @@ public final class space/kscience/kmath/structures/FloatBufferKt {
 	public static final fun FloatBuffer (ILkotlin/jvm/functions/Function1;)[F
 	public static final fun FloatBuffer ([F)[F
 	public static final fun asBuffer ([F)[F
-	public static final fun getArray (Lspace/kscience/kmath/structures/MutableBuffer;)[F
+	public static final fun toFloatArray (Lspace/kscience/kmath/structures/Buffer;)[F
 }
 
 public final class space/kscience/kmath/structures/IntBuffer : space/kscience/kmath/structures/MutableBuffer {
@@ -2412,7 +2413,7 @@ public final class space/kscience/kmath/structures/IntBufferKt {
 	public static final fun IntBuffer (ILkotlin/jvm/functions/Function1;)[I
 	public static final fun IntBuffer ([I)[I
 	public static final fun asBuffer ([I)[I
-	public static final fun getArray (Lspace/kscience/kmath/structures/MutableBuffer;)[I
+	public static final fun toIntArray (Lspace/kscience/kmath/structures/Buffer;)[I
 }
 
 public final class space/kscience/kmath/structures/ListBuffer : space/kscience/kmath/structures/Buffer {
@@ -2470,7 +2471,7 @@ public final class space/kscience/kmath/structures/LongBufferKt {
 	public static final fun LongBuffer (ILkotlin/jvm/functions/Function1;)[J
 	public static final fun LongBuffer ([J)[J
 	public static final fun asBuffer ([J)[J
-	public static final fun getArray (Lspace/kscience/kmath/structures/MutableBuffer;)[J
+	public static final fun toLongArray (Lspace/kscience/kmath/structures/Buffer;)[J
 }
 
 public class space/kscience/kmath/structures/MemoryBuffer : space/kscience/kmath/structures/Buffer {
@@ -2749,7 +2750,7 @@ public final class space/kscience/kmath/structures/RealBufferKt {
 	public static final fun RealBuffer ([D)[D
 	public static final fun asBuffer ([D)[D
 	public static final fun contentEquals-2uVC2J0 ([D[D)Z
-	public static final fun getArray (Lspace/kscience/kmath/structures/MutableBuffer;)[D
+	public static final fun toDoubleArray (Lspace/kscience/kmath/structures/Buffer;)[D
 }
 
 public final class space/kscience/kmath/structures/ShortBuffer : space/kscience/kmath/structures/MutableBuffer {
@@ -2785,7 +2786,7 @@ public final class space/kscience/kmath/structures/ShortBufferKt {
 	public static final fun ShortBuffer (ILkotlin/jvm/functions/Function1;)[S
 	public static final fun ShortBuffer ([S)[S
 	public static final fun asBuffer ([S)[S
-	public static final fun getArray (Lspace/kscience/kmath/structures/MutableBuffer;)[S
+	public static final fun toShortArray (Lspace/kscience/kmath/structures/Buffer;)[S
 }
 
 public final class space/kscience/kmath/structures/ValueFlag : java/lang/Enum {

kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/Buffer.kt

@@ -100,9 +100,29 @@ public fun <T> Buffer<T>.asSequence(): Sequence<T> = Sequence(::iterator)
 public fun <T> Buffer<T>.asIterable(): Iterable<T> = Iterable(::iterator)
 
 /**
- * Converts this [Buffer] to a new [List]
+ * Returns a new [List] containing all elements of this buffer.
  */
-public fun <T> Buffer<T>.toList(): List<T> = asSequence().toList()
+public fun <T> Buffer<T>.toList(): List<T> = when (this) {
+    is ArrayBuffer<T> -> array.toList()
+    is ListBuffer<T> -> list.toList()
+    is MutableListBuffer<T> -> list.toList()
+    else -> asSequence().toList()
+}
+
+/**
+ * Returns a new [MutableList] filled with all elements of this buffer.
+ */
+public fun <T> Buffer<T>.toMutableList(): MutableList<T> = when (this) {
+    is ArrayBuffer<T> -> array.toMutableList()
+    is ListBuffer<T> -> list.toMutableList()
+    is MutableListBuffer<T> -> list.toMutableList()
+    else -> asSequence().toMutableList()
+}
+
+/**
+ * Returns a new [Array] containing all elements of this buffer.
+ */
+public inline fun <reified T> Buffer<T>.toTypedArray(): Array<T> = asSequence().toList().toTypedArray()
 
 /**
  * Returns an [IntRange] of the valid indices for this [Buffer].
@@ -222,7 +242,7 @@ public inline class MutableListBuffer<T>(public val list: MutableList<T>) : Muta
  * @param T the type of elements contained in the buffer.
  * @property array The underlying array.
  */
-public class ArrayBuffer<T>(private val array: Array<T>) : MutableBuffer<T> {
+public class ArrayBuffer<T>(internal val array: Array<T>) : MutableBuffer<T> {
     // Can't inline because array is invariant
     override val size: Int
         get() = array.size

kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/FloatBuffer.kt

@@ -36,10 +36,12 @@ public inline fun FloatBuffer(size: Int, init: (Int) -> Float): FloatBuffer = Fl
 public fun FloatBuffer(vararg floats: Float): FloatBuffer = FloatBuffer(floats)
 
 /**
- * Returns a [FloatArray] containing all of the elements of this [MutableBuffer].
+ * Returns a new [FloatArray] containing all of the elements of this [Buffer].
  */
-public val MutableBuffer<out Float>.array: FloatArray
+public fun Buffer<Float>.toFloatArray(): FloatArray = when(this) {
-    get() = (if (this is FloatBuffer) array else FloatArray(size) { get(it) })
+    is FloatBuffer -> array.copyOf()
+    else -> FloatArray(size, ::get)
+}
 
 /**
  * Returns [FloatBuffer] over this array.

kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/IntBuffer.kt

@@ -35,10 +35,12 @@ public inline fun IntBuffer(size: Int, init: (Int) -> Int): IntBuffer = IntBuffe
 public fun IntBuffer(vararg ints: Int): IntBuffer = IntBuffer(ints)
 
 /**
- * Returns a [IntArray] containing all of the elements of this [MutableBuffer].
+ * Returns a new [IntArray] containing all of the elements of this [Buffer].
  */
-public val MutableBuffer<out Int>.array: IntArray
+public fun Buffer<Int>.toIntArray(): IntArray = when(this) {
-    get() = (if (this is IntBuffer) array else IntArray(size) { get(it) })
+    is IntBuffer -> array.copyOf()
+    else -> IntArray(size, ::get)
+}
 
 /**
  * Returns [IntBuffer] over this array.

kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/LongBuffer.kt

@@ -35,10 +35,12 @@ public inline fun LongBuffer(size: Int, init: (Int) -> Long): LongBuffer = LongB
 public fun LongBuffer(vararg longs: Long): LongBuffer = LongBuffer(longs)
 
 /**
- * Returns a [IntArray] containing all of the elements of this [MutableBuffer].
+ * Returns a new [LongArray] containing all of the elements of this [Buffer].
  */
-public val MutableBuffer<out Long>.array: LongArray
+public fun Buffer<Long>.toLongArray(): LongArray = when(this) {
-    get() = (if (this is LongBuffer) array else LongArray(size) { get(it) })
+    is LongBuffer -> array.copyOf()
+    else -> LongArray(size, ::get)
+}
 
 /**
  * Returns [LongBuffer] over this array.

kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/RealBuffer.kt

@@ -40,10 +40,12 @@ public fun RealBuffer(vararg doubles: Double): RealBuffer = RealBuffer(doubles)
 public fun RealBuffer.contentEquals(vararg doubles: Double): Boolean = array.contentEquals(doubles)
 
 /**
- * Returns a [DoubleArray] containing all of the elements of this [MutableBuffer].
+ * Returns a new [DoubleArray] containing all of the elements of this [Buffer].
  */
-public val MutableBuffer<out Double>.array: DoubleArray
+public fun Buffer<Double>.toDoubleArray(): DoubleArray = when(this) {
-    get() = (if (this is RealBuffer) array else DoubleArray(size) { get(it) })
+    is RealBuffer -> array.copyOf()
+    else -> DoubleArray(size, ::get)
+}
 
 /**
  * Returns [RealBuffer] over this array.

kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/ShortBuffer.kt

@@ -33,10 +33,12 @@ public inline fun ShortBuffer(size: Int, init: (Int) -> Short): ShortBuffer = Sh
 public fun ShortBuffer(vararg shorts: Short): ShortBuffer = ShortBuffer(shorts)
 
 /**
- * Returns a [ShortArray] containing all of the elements of this [MutableBuffer].
+ * Returns a new [ShortArray] containing all of the elements of this [Buffer].
  */
-public val MutableBuffer<out Short>.array: ShortArray
+public fun Buffer<Short>.toShortArray(): ShortArray = when(this) {
-    get() = (if (this is ShortBuffer) array else ShortArray(size) { get(it) })
+    is ShortBuffer -> array.copyOf()
+    else -> ShortArray(size, ::get)
+}
 
 /**
  * Returns [ShortBuffer] over this array.