using System;
using System.Diagnostics;

/// <summary>
/// A disposable base class.
/// </summary>
/// <seealso cref="T:System.IDisposable" />
public abstract class DisposableBase : IDisposable
{
    private bool _disposed;

    /// <summary>
    /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
    /// </summary>
    [DebuggerStepThrough]
    public void Dispose() => Dispose(false);

    /// <summary>
    /// Finalizes an instance of the DisposableBase class.
    /// </summary>
    [DebuggerStepThrough]
    ~DisposableBase() => Dispose(true);

    /// <summary>
    ///     Dispose resources.
    /// </summary>
    protected virtual void DisposeResources() { }

    /// <summary>
    /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
    /// </summary>
    /// <param name="isFinalizing">true if this DisposableBase is finalizing.</param>
    [DebuggerStepThrough]
    private void Dispose(bool isFinalizing) {
        if(_disposed) return;
        DisposeResources();
        if(!isFinalizing) GC.SuppressFinalize(this);
        _disposed = true;
    }
}