/// <summary>
/// Creates a new <see cref="IAsyncEnumerable{T}"/> which will allow at most one <see cref="IAsyncEnumerator{T}"/> to be active at once.
/// </summary>
/// <typeparam name="T">The type of items being enumerated.</typeparam>
/// <param name="startInfo">The <see cref="SequentialEnumerationStartInfo{T}"/> containing callbacks to use.</param>
/// <param name="asyncProvider">The <see cref="IAsyncProvider"/> for the returned <see cref="IAsyncEnumerable{T}"/>.</param>
/// <returns>A new instance of <see cref="IAsyncEnumerable{T}"/> which behaves like callbacks in <paramref name="startInfo"/> specified.</returns>
public static IAsyncEnumerable <T> CreateExclusiveSequentialEnumerable <T>(
SequentialEnumerationStartInfo <T> startInfo,
IAsyncProvider asyncProvider
) => new AsyncEnumerableExclusive <T>(SequentialCurrentInfoFactory.GetInstance(startInfo.MoveNext, startInfo.Dispose), asyncProvider);
/// <summary>
/// Creates a new instance of <see cref="IAsyncEnumerator{T}"/> which fetches one item at a time using given callback.
/// </summary>
/// <typeparam name="T">The type of items being enumerated.</typeparam>
/// <param name="moveNext">The callback for potentially asynchronously fetching next item.</param>
/// <param name="dispose">The callback to dispose enumerator.</param>
/// <returns>A new instance of <see cref="IAsyncEnumerator{T}"/> which behaves like <paramref name="moveNext"/> and <paramref name="dispose"/> specify.</returns>
/// <remarks>
/// The returned <see cref="IAsyncEnumerator{T}"/> will have guard code to prevent concurrent invocation.
/// </remarks>
public static IAsyncEnumerator <T> CreateSequentialEnumerator <T>(
MoveNextAsyncDelegate <T> moveNext,
EnumerationEndedDelegate dispose
) => new AsyncEnumerator <T>(SequentialCurrentInfoFactory.GetInstance(moveNext, dispose));