Searching a special feature – is this possible?

Searching a feature to limit a single product in cart to one productvariant. If this one product is in cart, no other products in cart are allowed. There ist no amount limitation about this one product (1, 20 or 100 pieces), but just this one product-variant.
This activation must be in option on product level. And there must be some filters with error messaging for customers on try putting this product in a filled cart or add a second other product in to cart.