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10_Wiki/Topic_Programming/Topic_CPP/CPP_Inheritance_Access.md

@@ -0,0 +1,71 @@
+---
+id: cpp-inheritance-access
+title: "C++ Inheritance Access"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["protected access specifier", "C++ 상속과 protected"]
+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", "inheritance", "protected"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_inheritance_access.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP Inheritance Access]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+This chapter reveals WHY `protected` exists as a third option distinct from `private`: a `private` attribute in the base class would be completely UNREACHABLE by the derived class's own methods, forcing awkward workarounds, while `protected` lets `Programmer`'s `setSalary()`/`getSalary()` methods directly manipulate `Employee`'s `salary` field as if it were their own — meaning `protected` specifically solves the "I need child classes to touch this, but nobody else" access pattern that neither `public` nor `private` alone can express. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`protected`** — similar to `private` (inaccessible from OUTSIDE the class), but UNLIKE `private`, accessible from DERIVED (child) classes. [S1]
+- **Derived-class methods manipulating a protected base attribute** — `Programmer`'s `setSalary()`/`getSalary()` methods read/write `Employee`'s `protected int salary;` directly, as if it belonged to `Programmer`. [S1]
+
+## 📖 세부 내용 (Details)
+- A protected base attribute manipulated by a derived class's own methods: `class Employee { protected: int salary; }; class Programmer: public Employee { public: int bonus; void setSalary(int s) { salary = s; } int getSalary() { return salary; } }; Programmer myObj; myObj.setSalary(50000); myObj.bonus = 15000;`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **protected는 private과 public 사이의 중간 지점**: 클래스 외부에서는 접근 불가하다는 점에서 private과 같지만, 파생 클래스에서는 접근 가능하다는 점에서 다르다는 것이 확인됨 — 이는 private만으로는 해결 못 하는 "자식 클래스만 접근 허용" 요구를 해결. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+Employee의 protected 급여(salary)를 Programmer 파생 클래스가 자체 getter/setter로 직접 다루는 예제가 protected의 대표 실전 활용 사례로 원문에 직접 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+A protected base attribute directly manipulated by a derived class's own methods (C++):
+```cpp
+class Employee {
+protected: // accessible in derived classes, not outside
+  int salary;
+};
+class Programmer: public Employee {
+public:
+  int bonus;
+  void setSalary(int s) { salary = s; }
+  int getSalary() { return salary; }
+};
+```
+
+## ✅ 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]], [[CPP Access Specifiers]], [[CPP Inheritance Multilevel]]
+- **참조 맥락:** 상속과 protected — 다단계 상속(Inheritance Multilevel) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ Inheritance Access — https://www.w3schools.com/cpp/cpp_inheritance_access.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Inheritance Access" page (Astra wiki-curation, P-Reinforce v3.1 format).