ComPtr how to detect it is Empty or null or not init ?

[sgf]

        /// <summary>
        /// Initializes a new SolidBrush for the given Graphics device using a transparent Color.
        /// </summary>
        /// <param name="renderTarget">A Graphics device.</param>
        public SolidBrush(ComPtr<ID2D1HwndRenderTarget> renderTarget):this()
        {
            if (renderTarget!=) throw new ArgumentNullException(nameof(renderTarget));
            renderTarget.CreateSolidColorBrush(default, new BrushProperties(), ref _brush);
        }

if (renderTarget!=)

At the same time, I am not sure which variable definitions in Silk.NET need to be surrounded by ComPtr<> and which do not. I am not good at C++ and I am not good at using smart pointers.
So I don't know anything about it.
If I define ComPtr as a parameter, can I pass it directly without applying ref and other description (like ComPtr* or ComPtr** or ref ComPtr* etc.. )?

[Beyley]

You can just check if its default or not, since default will be a nullptr

[sgf]

I've tried it but it doesn't support it.

[qian-o]

The ComPtr has a Handle member, which can be used to determine.

[sgf]

I have switched to DirectN now. Although DirectN also has some problems.
But Silk seems to have more problems.
Typical example: Matrix3x2 cannot be multiplied by Matrix3x2.
Or conversion between ID2DSolidColorBrush and ID2DBrush (operator overloading only supports one-way conversion).

There are many more questions like this, so I won’t list them all.
Thanks for your patience in answering.

Silk's packaging is very clever, but it doesn't look perfect yet. When I encounter some problems, it is difficult to solve them in simple ways. Or because ease of use and performance are inherently incompatible.