using System;

using System.Runtime.InteropServices;

using System.Runtime.CompilerServices;

​

//https://stackoverflow.com/questions/75421336/any-alternative-about-cs0233-for-sizeoft-in-structlayoutattribute

​

[StructLayout(LayoutKind.Sequential, Pack = 1)]

public struct Vector3<T> where T : unmanaged

{

    public T X, Y, Z;

​

    public Vector3(T x, T y, T z) => (X, Y, Z) = (x, y, z);

}

public class Program

{

    public static void Main()

    {

        Console.WriteLine($"Unsafe.SizeOf<Vector3<int>>()={Unsafe.SizeOf<Vector3<int>>()}"); // 12

        Console.WriteLine($"Unsafe.SizeOf<Vector3<double>>()={Unsafe.SizeOf<Vector3<double>>()}"); // 24

        Console.WriteLine($"Unsafe.SizeOf<Vector3<byte>>()={Unsafe.SizeOf<Vector3<byte>>()}");

        Console.WriteLine($"Unsafe.SizeOf<Vector3<long>>()={Unsafe.SizeOf<Vector3<long>>()}");

        Console.WriteLine($"Unsafe.SizeOf<Vector3<decimal>>()={Unsafe.SizeOf<Vector3<decimal>>()}");

    }

}