Does the "visitor" pattern violate the OCP principle?

Question

OOP

There is an interface:

interface Visitor:
    visitA(a: A)
    visitB(b: B)
    visitC(c: C)

And some implementations:

class SlowVisitor: 
    visitA(a: A)
    visitB(b: B)
    visitC(c: C)
class FastVisitor: 
    visitA(a: A)
    visitB(b: B)
    visitC(c: C)

Suppose we add a new object D. We have to change the interface:

interface Visitor:
    visitA(a: A)
    visitB(b: B)
    visitC(c: C)
    visitD(d: D)

With a change in the interface, ALL visitors will have to change. Are we violating the OCP in this case?

Answer 1

Patterns are not dogma, like all principles. You weigh the pros and cons and choose a solution. It's like cutting off a leg in surgery is bad, but if it's gangrene, then it's necessary.