An unmanaged constructed type is a data type that is generated at runtime in .NET programming and is not monitored by the garbage collector. These types are often used in situations where the type is only needed within a single method or block of code and has a limited lifespan. The System.Reflection.Emit namespace is used to create these types …

unmanaged-constructed-types.cs

using System;

public struct Coords<T>
{
  public T X;
  public T Y;
}

public class UnmanagedTypes
{
  public static void Main()
  {
    DisplaySize<Coords<int>>();
    DisplaySize<Coords<double>>();
  }

  private unsafe static void DisplaySize<T>() where T : unmanaged
  {
    Console.WriteLine($"{typeof(T)} is unmanaged and its size is {sizeof(T)} bytes");
  }
}
// Output:
// Coords`1[System.Int32] is unmanaged and its size is 8 bytes
// Coords`1[System.Double] is unmanaged and its size is 16 bytes