Visitor
E173622
Visitor is a behavioral design pattern that lets you separate algorithms from the objects on which they operate by allowing new operations to be defined without changing the classes of the elements they act on.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Visitor canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T1531335 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Visitor Context triple: [Design Patterns: Elements of Reusable Object-Oriented Software, describesPattern, Visitor]
-
A.
Wanderer
Wanderer is Sterling Hayden’s autobiographical memoir, renowned for its candid reflections on his Hollywood career, seafaring life, and political disillusionment.
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B.
StarWalker
StarWalker is a Montblanc luxury writing instrument line known for its modern, futuristic design and distinctive floating emblem.
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C.
Nomade
Nomade is a monumental outdoor sculpture by Spanish artist Jaume Plensa, composed of interlocking steel letters forming a hollow seated human figure.
-
D.
VP
VP is a common abbreviation for the Vice President of the United States, the second-highest executive officer in the U.S. federal government and first in the presidential line of succession.
-
E.
Networker
Networker is a family of electric and diesel multiple-unit trains used on suburban and regional rail services in southeast England.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Visitor Target entity description: Visitor is a behavioral design pattern that lets you separate algorithms from the objects on which they operate by allowing new operations to be defined without changing the classes of the elements they act on.
-
A.
Wanderer
Wanderer is Sterling Hayden’s autobiographical memoir, renowned for its candid reflections on his Hollywood career, seafaring life, and political disillusionment.
-
B.
StarWalker
StarWalker is a Montblanc luxury writing instrument line known for its modern, futuristic design and distinctive floating emblem.
-
C.
Nomade
Nomade is a monumental outdoor sculpture by Spanish artist Jaume Plensa, composed of interlocking steel letters forming a hollow seated human figure.
-
D.
VP
VP is a common abbreviation for the Vice President of the United States, the second-highest executive officer in the U.S. federal government and first in the presidential line of succession.
-
E.
Networker
Networker is a family of electric and diesel multiple-unit trains used on suburban and regional rail services in southeast England.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
behavioral design pattern
ⓘ
design pattern ⓘ |
| advantage |
adds new operations without modifying element classes
ⓘ
groups related operations in a single visitor class ⓘ makes adding new operations easy ⓘ supports different behaviors over the same object structure ⓘ |
| alsoKnownAs |
Visitor pattern
ⓘ
linked to:
Visitor design pattern
|
| applicableWhen |
object structure contains many distinct classes with different interfaces
ⓘ
object structure is relatively stable ⓘ operations over object structure are frequently changed or added ⓘ |
| belongsTo |
Gang of Four design patterns
ⓘ
linked to:
Gang of Four design pattern
|
| category | object-oriented design pattern ⓘ |
| collaboratesWith |
Composite pattern
ⓘ
Interpreter pattern ⓘ Iterator pattern ⓘ |
| commonLanguages |
C#
ⓘ
C++ ⓘ Java ⓘ Python ⓘ |
| commonUseCase |
operations over XML or JSON document trees
ⓘ
operations over file system directory trees ⓘ syntax tree processing in compilers and interpreters ⓘ |
| definedIn | Design Patterns: Elements of Reusable Object-Oriented Software ⓘ |
| disadvantage |
can break encapsulation by exposing element internals
ⓘ
increases coupling between visitors and element classes ⓘ makes adding new element classes harder ⓘ |
| enables | double dispatch ⓘ |
| keyMethod |
accept operation on Element
ⓘ
visit operation on Visitor ⓘ |
| originLanguage | C++ ⓘ |
| primaryIntent |
allow new operations to be defined without changing element classes
ⓘ
separate algorithms from the objects on which they operate ⓘ |
| relatedTo |
Command pattern
ⓘ
linked to:
Command
Composite pattern ⓘ Strategy pattern ⓘ
linked to:
Strategy (design pattern)
|
| structure |
Visitor interface declares visit methods for each concrete element type
ⓘ
each element class implements an accept(Visitor) method ⓘ |
| supports |
open/closed principle
ⓘ
linked to:
Open-Closed Principle
|
| typicalParticipants |
ConcreteElement
ⓘ
ConcreteVisitor ⓘ Element interface ⓘ ObjectStructure ⓘ Visitor interface ⓘ |
| usedFor |
accumulating results over object structures
ⓘ
adding new operations to object structures without modifying their classes ⓘ implementing double dispatch ⓘ performing operations over complex object structures ⓘ traversing composite object structures ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Visitor Description of subject: Visitor is a behavioral design pattern that lets you separate algorithms from the objects on which they operate by allowing new operations to be defined without changing the classes of the elements they act on.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.