#457: Add 'Seq.toArray' method.

jenetics/src/main/java/io/jenetics/util/Seq.java

@@ -577,7 +577,7 @@ public default Object[] toArray() {
 	 * @throws ArrayStoreException if the runtime type of the specified array is
 	 *         not a super type of the runtime type of every element in this
 	 *         array
-	 * @throws NullPointerException if the given array is {@code null}.
+	 * @throws NullPointerException if the given {@code array} is {@code null}.
 	 */
 	@SuppressWarnings("unchecked")
 	public default <B> B[] toArray(final B[] array) {
@@ -602,6 +602,25 @@ public default <B> B[] toArray(final B[] array) {
 		return array;
 	}
 
+	/**
+	 * Returns an array containing the elements of this sequence, using the
+	 * provided generator function to allocate the returned array.
+	 *
+	 * @since !__version__!
+	 *
+	 * @param generator a function which produces a new array of the desired
+	 *        type and the provided length
+	 * @param <B> the element type of the resulting array
+	 * @return an array containing the elements in {@code this} sequence
+	 * @throws ArrayStoreException if the runtime type of the specified array is
+	 *         not a super type of the runtime type of every element in this
+	 *         array
+	 * @throws NullPointerException if the given {@code generator} is {@code null}.
+	 */
+	public default <B> B[] toArray(final IntFunction<B[]> generator) {
+		return toArray(generator.apply(length()));
+	}
+
 	/**
 	 * Returns a view of the portion of this sequence between the specified
 	 * {@code start}, inclusive, and {@code end}, exclusive. (If {@code start}

jenetics/src/test/java/io/jenetics/util/SeqTest.java

@@ -184,4 +184,14 @@ public void toArray4() {
 		final Integer[] array = mseq.toArray(new Integer[]{1, 2, 3, 4});
 	}
 
+	@Test
+	public void toArray5() {
+		final Seq<String> mseq = MSeq.of("1", "2");
+		final String[] array = mseq.toArray(String[]::new);
+
+		Assert.assertEquals(array.length, 2);
+		Assert.assertEquals(array[0], mseq.get(0));
+		Assert.assertEquals(array[1], mseq.get(1));
+	}
+
 }