namespace Chernobyl
{
    /// <summary>
    /// Signature for methods which acts as a response channel to some action.
    /// </summary>
    /// <typeparam name="T">The type returned to the response channel.</typeparam>
    /// <param name="value">The value returned to the response channel.</param>
    public delegate void Callback<in T>(T value);

    /// <summary>
    /// Signature for methods which act as a stream of data. The invoked method
    /// will take in the <paramref name="subscriber"/> and invoke whenever
    /// necessary.
    /// </summary>
    /// <typeparam name="T">The type returned to the response channel.</typeparam>
    /// <param name="subscriber">The method that is to receive the stream of data.</param>
    public delegate void Subscribe<out T>(Callback<T> subscriber);
}