Method wrap

src/main/java/io/reactivex/rxjava3/core/Single.java:2047–2056

Wraps a SingleSource instance into a new Single instance if not already a Single instance. Scheduler: wrap does no

(@NonNull SingleSource<T> source)

     * @throws NullPointerException if {@code source} is {@code null}
     */
    @CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <@NonNull T> Single<T> wrap(@NonNull SingleSource<T> source) {
        Objects.requireNonNull(source, "source is null");
        if (source instanceof Single) {
            return RxJavaPlugins.onAssembly((Single<T>)source);
        }
        return RxJavaPlugins.onAssembly(new SingleFromUnsafeSource<>(source));
    }

    /**
     * Waits until all {@link SingleSource} sources provided by the {@link Iterable} sequence signal a success