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72 lines
3.5 KiB
Markdown
72 lines
3.5 KiB
Markdown
---
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id: cpp-enum
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title: "C++ Enumeration (enum)"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["enum keyword", "named constants", "C++ 열거형"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.85
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["cpp", "programming-language", "w3schools", "enums"]
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raw_sources: ["https://www.w3schools.com/cpp/cpp_enum.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CPP Enumeration (enum)]]
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## 🎯 한 줄 통찰 (One-line insight)
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This chapter is essentially IDENTICAL to C's enum chapter in every detail — default zero-based numbering, forward-cascading custom values, and enum-in-switch usage all reappear with the exact same `Level`/`LOW`/`MEDIUM`/`HIGH` example — the only visible change is `cout <<` replacing `printf("%d", ...)`, confirming C++ inherited its enum semantics from C completely unmodified (unlike structs, where C++ added meaningful new behavior). [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`enum`** — a type representing a group of named, unchangeable constants. [S1]
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- **Default numbering** — first item is 0, second is 1, etc. [S1]
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- **Forward-cascading custom values** — setting one item's value shifts all subsequent unlabeled items to continue counting up from it. [S1]
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- **Enum as an int under the hood** — printing an enum variable with `cout <<` shows its underlying integer value, enabling direct use in `switch` statements. [S1]
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## 📖 세부 내용 (Details)
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- Default numbering: `enum Level { LOW, MEDIUM, HIGH }; enum Level myVar = MEDIUM; cout << myVar; // 1`. [S1]
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- Fully custom values: `enum Level { LOW = 25, MEDIUM = 50, HIGH = 75 };`. [S1]
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- Cascading from one custom value: `enum Level { LOW = 5, MEDIUM, HIGH };` — MEDIUM becomes 6, HIGH becomes 7. [S1]
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- Enum used in a switch: `enum Level myVar = MEDIUM; switch (myVar) { case 1: ... case 2: ... case 3: ... }`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources). C 챕터와 완전히 동일한 열거형 동작(기본 번호 매기기, 연쇄적 값 갱신, switch 연동)이 확인됨.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 요일이나 월과 같이 절대 변하지 않는 값 집합에 enum을 사용하는 것이 실전 활용의 대표 사례로 원문에 직접 제시됨. [S1]
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## 💻 코드 패턴 (Code patterns)
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Setting one enum value causes subsequent items to cascade forward from it (C++):
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```cpp
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enum Level {
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LOW = 5,
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MEDIUM, // Now 6
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HIGH // Now 7
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};
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.85
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[C++ Tutorial]]
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- **관련 개념:** [[CPP Structs]], [[CPP Switch]], [[CPP References]], [[C Enums]]
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- **참조 맥락:** 구조체 및 열거형 섹션 마지막 — 참조·포인터·메모리(References, Pointers & Memory) 섹션으로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C++ Enumeration (enum) — https://www.w3schools.com/cpp/cpp_enum.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Enumeration (enum)" page (Astra wiki-curation, P-Reinforce v3.1 format).
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