// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace System.Runtime.InteropServices.ComTypes
{
    /// <summary>
    /// The IEnumSTATDATA interface is used to enumerate through an array of
    /// STATDATA structures, which contain advisory connection information for
    /// a data object. IEnumSTATDATA has the same methods as all enumerator
    /// interfaces: Next, Skip, Reset, and Clone.
    /// </summary>
    [ComImport]
    [Guid("00000105-0000-0000-C000-000000000046")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IEnumSTATDATA
    {

        /// <summary>
        /// Retrieves the next celt items in the enumeration sequence. If there are
        /// fewer than the requested number of elements left in the sequence, it
        /// retrieves the remaining elements. The number of elements actually
        /// retrieved is returned through pceltFetched (unless the caller passed
        /// in NULL for that parameter).
        /// </summary>
        [PreserveSig]
        int Next(int celt, [Out, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] STATDATA[] rgelt, [Out, MarshalAs(UnmanagedType.LPArray, SizeConst = 1)] int[] pceltFetched);

        /// <summary>
        /// Skips over the next specified number of elements in the enumeration sequence.
        /// </summary>
        [PreserveSig]
        int Skip(int celt);

        /// <summary>
        /// Resets the enumeration sequence to the beginning.
        /// </summary>
        [PreserveSig]
        int Reset();

        /// <summary>
        /// Creates another enumerator that contains the same enumeration state as
        /// the current one. Using this function, a client can record a particular
        /// point in the enumeration sequence and then return to that point at a
        /// later time. The new enumerator supports the same interface as the original one.
        /// </summary>
        void Clone(out IEnumSTATDATA newEnum);
    }
}