C#泛型,限制特定结构

public class Stack<T>
{
    private T[] _elements;
    private int _count;

    public Stack(int capacity)
    {
        _elements = new T[capacity];
        _count = 0;
    }

    public void Push(T item)
    {
        if (_count == _elements.Length)
        {
            throw new InvalidOperationException("Stack is full");
        }

        _elements[_count] = item;
        _count++;
    }

    public T Pop()
    {
        if (_count == 0)
        {
            throw new InvalidOperationException("Stack is empty");
        }

        T item = _elements[_count - 1];
        _count--;
        return item;
    }
}

public static void Swap<T>(ref T a, ref T b)
{
    T temp = a;
    a = b;
    b = temp;
}

public class MyClass<T> where T : ISomeInterface
{
    // ...
}