---
id: cpp-inheritance-multilevel
title: "C++ Multilevel Inheritance"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["grandchild class", "chained inheritance", "C++ 다단계 상속"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.84
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["cpp", "programming-language", "w3schools", "oop", "inheritance"]
raw_sources: ["https://www.w3schools.com/cpp/cpp_inheritance_multilevel.asp"]
applied_in: []
github_commit: ""
---

# [[CPP Multilevel Inheritance]]

## 🎯 한 줄 통찰 (One-line insight)
`MyGrandChild` never mentions `MyClass` anywhere in its own declaration — it only inherits from `MyChild`, yet calling `myFunction()` (defined in `MyClass`) works perfectly, proving inheritance CHAINS transitively: a grandchild automatically gets everything its parent has, INCLUDING whatever the parent itself inherited, without needing to re-declare or re-reference the original ancestor at any point in the chain. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Multilevel inheritance** — a class derived from ANOTHER derived class (a chain: grandparent → parent → child). [S1]
- **Transitive inheritance** — the grandchild class automatically has access to the ORIGINAL base class's members, even though it never directly references that base class. [S1]

## 📖 세부 내용 (Details)
- A three-level inheritance chain: `class MyClass { public: void myFunction() { cout << "Some content in parent class."; } }; class MyChild: public MyClass { }; class MyGrandChild: public MyChild { }; MyGrandChild myObj; myObj.myFunction(); // works, inherited transitively through MyChild`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **상속은 전이적(transitive)으로 작동**: 손자 클래스가 원래의 베이스 클래스를 전혀 언급하지 않아도, 부모를 거쳐 그 기능을 자동으로 물려받는다는 점이 직접 예제로 증명됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — MyClass → MyChild → MyGrandChild의 3단계 상속 체인이 다단계 상속의 개념적 골격을 보여준다. [S1]

## 💻 코드 패턴 (Code patterns)
A three-level inheritance chain — the grandchild inherits transitively (C++):
```cpp
class MyClass { // grandparent
public:
  void myFunction() { cout << "Some content in parent class."; }
};
class MyChild: public MyClass { }; // parent
class MyGrandChild: public MyChild { }; // child
int main() {
  MyGrandChild myObj;
  myObj.myFunction(); // works via the full chain
  return 0;
}
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.84
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[C++ Tutorial]]
- **관련 개념:** [[CPP Inheritance Access]], [[CPP Inheritance Multiple]]
- **참조 맥락:** 다단계 상속 — 다중 상속(Inheritance Multiple) 챕터로 이어짐.

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

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