---
id: cpp-polymorphism
title: "C++ Polymorphism"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["method overriding", "many forms", "C++ 다형성"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.86
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["cpp", "programming-language", "w3schools", "oop", "polymorphism"]
raw_sources: ["https://www.w3schools.com/cpp/cpp_polymorphism.asp"]
applied_in: []
github_commit: ""
---

# [[CPP Polymorphism]]

## 🎯 한 줄 통찰 (One-line insight)
Polymorphism is explicitly framed as Inheritance's NATURAL EXTENSION, not a separate feature — the source states "Inheritance lets us inherit... Polymorphism uses those methods to perform different tasks," meaning a `Pig` and `Dog` REDEFINING the SAME method name (`animalSound()`) inherited from `Animal` isn't a new syntax to learn, it's simply what happens when a derived class writes its own version of a method it already inherited by name. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Polymorphism** — "many forms"; occurs when related classes (via inheritance) implement the SAME method name differently, so ONE action behaves differently per class. [S1]
- **Method overriding** — a derived class REDEFINES a method it inherited from the base class, with the SAME name and signature. [S1]
- **Direct extension of inheritance** — polymorphism doesn't add new syntax; it's just what happens when derived classes redefine an inherited method name. [S1]

## 📖 세부 내용 (Details)
- Three classes with the SAME method name, each behaving differently: `class Animal { public: void animalSound() { cout << "The animal makes a sound \n"; } }; class Pig : public Animal { public: void animalSound() { cout << "The pig says: wee wee \n"; } }; class Dog : public Animal { public: void animalSound() { cout << "The dog says: bow wow \n"; } };` — calling `.animalSound()` on each object type produces its own class's version. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

## 🛠️ 적용 사례 (Applied in summary)
Animal 기반 클래스의 animalSound()를 Pig와 Dog가 각각 다르게 재정의하는 예제가 원문에서 직접 실전 활용 사례로 제시됨(동일한 행동, 클래스마다 다른 구현). [S1]

## 💻 코드 패턴 (Code patterns)
The same method name behaving differently across sibling derived classes (C++):
```cpp
class Animal {
public:
  void animalSound() { cout << "The animal makes a sound \n"; }
};
class Pig : public Animal {
public:
  void animalSound() { cout << "The pig says: wee wee \n"; }
};
class Dog : public Animal {
public:
  void animalSound() { cout << "The dog says: bow wow \n"; }
};
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.86
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[C++ Tutorial]]
- **관련 개념:** [[CPP Inheritance Multiple]], [[CPP Virtual Functions]]
- **참조 맥락:** 다형성 — 가상 함수(Virtual Functions) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — C++ Polymorphism — https://www.w3schools.com/cpp/cpp_polymorphism.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Polymorphism" page (Astra wiki-curation, P-Reinforce v3.1 format).