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10_Wiki/Dev/Topic_CPP/CPP_Constructors.md

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+---
+id: cpp-constructors
+title: "C++ Constructors"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["constructor rules", "same name as class", "no return type", "C++ 생성자"]
+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", "constructors"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_constructors.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP Constructors]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A constructor breaks TWO rules every other function in C++ follows — it has NO return type at all, "not even void," and its name must be IDENTICAL to the class name — meaning a constructor isn't really "a special kind of function" so much as a fundamentally different syntactic category that happens to look function-shaped, distinguished purely by the compiler recognizing the name-matches-class pattern. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Constructor** — a special method AUTOMATICALLY called when an object is created; runs with zero explicit invocation from the programmer. [S1]
+- **Four constructor rules** — same name as the class; NO return type (not even `void`); usually declared `public`; automatically called on object creation. [S1]
+- **Constructor with parameters** — sets initial attribute values at creation time (`Car(string x, string y, int z) { brand = x; ... }`), so each object starts pre-configured. [S1]
+- **Defined outside the class** — same `::` scope resolution pattern as regular methods. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic parameterless constructor: `class MyClass { public: MyClass() { cout << "Hello World!"; } }; MyClass myObj; // triggers the constructor automatically`. [S1]
+- Constructor with parameters setting initial attributes: `class Car { public: string brand; string model; int year; Car(string x, string y, int z) { brand = x; model = y; year = z; } }; Car carObj1("BMW", "X5", 1999);`. [S1]
+- Defined outside the class via `::`: `Car(string x, string y, int z); // declaration Car::Car(string x, string y, int z) { brand = x; model = y; year = z; } // definition`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **생성자는 반환 타입이 전혀 없음**: void조차 쓰지 않는다는 점과 클래스 이름과 완전히 동일해야 한다는 점이 다른 모든 함수/메서드와 근본적으로 다른 두 가지 규칙으로 명시됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+피자 주문 비유("생성자는 소스·치즈·토핑을 미리 얹어주는 요리사")가 생성자가 객체 생성 시 자동으로 초기 설정을 마쳐준다는 개념을 직관적으로 설명하는 실전 비유로 원문에 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+A constructor with parameters setting initial attribute values automatically (C++):
+```cpp
+class Car {
+public:
+  string brand;
+  string model;
+  int year;
+  Car(string x, string y, int z) { // Constructor with parameters
+    brand = x;
+    model = y;
+    year = z;
+  }
+};
+int main() {
+  Car carObj1("BMW", "X5", 1999); // constructor runs automatically
+  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:** 0.86
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[C++ Tutorial]]
+- **관련 개념:** [[CPP Class Methods]], [[CPP Constructors Overloading]], [[CPP Function Overloading]]
+- **참조 맥락:** 생성자 — 생성자 오버로딩(Constructors Overloading) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ Constructors — https://www.w3schools.com/cpp/cpp_constructors.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Constructors" page (Astra wiki-curation, P-Reinforce v3.1 format).