SafePointerHandle.cs

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using System;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
 
namespace Internal.Cryptography.Pal.Native;
 
internal abstract class SafePointerHandle<T> : SafeHandle where T : SafeHandle, new()
{
    public sealed override bool IsInvalid => handle == IntPtr.Zero;
 
    public static T InvalidHandle => Microsoft.Win32.SafeHandles.SafeHandleCache<T>.GetInvalidHandle(() => new T());
 
    protected SafePointerHandle()
        : base(IntPtr.Zero, ownsHandle: true)
    {
    }
 
    protected override void Dispose(bool disposing)
    {
        if (!Microsoft.Win32.SafeHandles.SafeHandleCache<T>.IsCachedInvalidHandle(this))
        {
            base.Dispose(disposing);
        }
    }
}