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using System;
using System.Collections.Generic;

namespace System.Reactive
{
    public static class Observable
    {
        /// <summary>
        /// Creates an observable sequence object from the specified subscription function.
        /// </summary>
        /// <typeparam name="subscribe">Subscribe method implementation.</typeparam>
        public static IObservable<T> Create<T>(Func<ObserverBase<T>, ISubscription> subscribe) 
        {
            return new AnonymousObservable<T>((obs) => obs.Add(subscribe(obs)));
        }

        /// <summary>
        /// Creates an observable sequence object from the specified subscription function.
        /// </summary>
        /// <typeparam name="subscribe">Subscribe method implementation.</typeparam>
        public static IObservable<T> Create<T>(Action<ObserverBase<T>> subscribe) 
        {
            return new AnonymousObservable<T>((obs) => subscribe(obs));
        }

        /// <summary>
        /// Creates an observable from it's arguments
        /// </summary>
        public static IObservable<T> Of<T>(params T[] args)
        {
            return Observable.Create<T>((ObserverBase<T> obs) => obs.Of(args));
        }
    }
}
using System;

namespace System.Reactive
{
    /// <summary>
    /// Class to create an IObservable&lt;T&gt; instance from a delegate-based implementation of the Subscribe method.
    /// </summary>
    /// <typeparam name="T">The type of the elements in the sequence.</typeparam>
    public class AnonymousObservable<T> : ObservableBase<T>
    {
        readonly Action<ObserverBase<T>> _subscribe;

        /// <summary>
        /// Creates an observable sequence object from the specified subscription function.
        /// </summary>
        /// <param name="subscribe">Subscribe method implementation.</param>
        /// <exception cref="ArgumentNullException"><paramref name="subscribe"/> is null.</exception>
        public AnonymousObservable(Action<ObserverBase<T>> subscribe)
        {
            if (subscribe == null)
                throw new ArgumentNullException("subscribe");

            _subscribe = subscribe;
        }

        /// <summary>
        /// Calls the subscription function that was supplied to the constructor.
        /// </summary>
        /// <param name="observer">Observer to send notifications to.</param>
        /// <returns>Disposable object representing an observer's subscription to the observable sequence.</returns>
        internal override void UnsafeSubscribe(ObserverBase<T> observer)
        {
            _subscribe(observer);
        }
    }
}