Add the cast operator to Single.

src/main/java/rx/Single.java

@@ -210,6 +210,21 @@ private static <T> Observable<T> asObservable(Single<T> t) {
      * *********************************************************************************************************
      */
 
+    /**
+     * Casts the success value of the current Single into the target type or signals a
+     * ClassCastException if not compatible.
+     * <dl>
+     * <dt><b>Scheduler:</b></dt>
+     * <dd>{@code cast} does not operate by default on a particular {@link Scheduler}.</dd>
+     * </dl>
+     * @param <R> the target type
+     * @param klass the type token to use for casting the success result from the current Single
+     * @return the new Single instance
+     */
+    public final <R> Single<R> cast(final Class<R> klass) {
+        return map(new SingleOperatorCast<T, R>(klass));
+    }
+
     /**
      * Returns an Observable that emits the items emitted by two Singles, one after the other.
      * <p>

src/main/java/rx/internal/operators/SingleOperatorCast.java

@@ -0,0 +1,27 @@
+/*
+ * This is the confidential unpublished intellectual property of EMC Corporation,
+ * and includes without limitation exclusive copyright and trade secret rights
+ * of EMC throughout the world.
+ */
+package rx.internal.operators;
+
+import rx.functions.Func1;
+
+/**
+ * Converts the element of a Single to the specified type.
+ * @param <T> the input value type
+ * @param <R> the output value type
+ */
+public class SingleOperatorCast<T, R> implements Func1<T, R> {
+
+  final Class<R> castClass;
+
+  public SingleOperatorCast(Class<R> castClass) {
+    this.castClass = castClass;
+  }
+
+  @Override
+  public R call(T t) {
+    return castClass.cast(t);
+  }
+}

src/test/java/rx/internal/operators/SingleOperatorCastTest.java

@@ -0,0 +1,42 @@
+/*
+ * This is the confidential unpublished intellectual property of EMC Corporation,
+ * and includes without limitation exclusive copyright and trade secret rights
+ * of EMC throughout the world.
+ */
+package rx.internal.operators;
+;
+import org.junit.Test;
+import rx.Observer;
+import rx.Single;
+
+import static org.mockito.Mockito.*;
+
+public class SingleOperatorCastTest {
+
+    @Test
+    public void testSingleCast() {
+        Single<?> source = Single.just(1);
+        Single<Integer> single = source.cast(Integer.class);
+
+        @SuppressWarnings("unchecked")
+        Observer<Integer> observer = mock(Observer.class);
+        single.subscribe(observer);
+        verify(observer, times(1)).onNext(1);
+        verify(observer, times(1)).onNext(1);
+        verify(observer, never()).onError(
+            org.mockito.Matchers.any(Throwable.class));
+        verify(observer, times(1)).onCompleted();
+    }
+
+    @Test
+    public void testSingleCastWithWrongType() {
+        Single<?> source = Single.just(1);
+        Single<Boolean> single = source.cast(Boolean.class);
+
+        @SuppressWarnings("unchecked")
+        Observer<Boolean> observer = mock(Observer.class);
+        single.subscribe(observer);
+        verify(observer, times(1)).onError(
+            org.mockito.Matchers.any(ClassCastException.class));
+    }
+}