2nd/10_Wiki/Dev/Topic_CPP/CPP_Enum.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
cpp-enum	C++ Enumeration (enum)	Programming_Language	draft	conceptual		enum keyword named constants C++ 열거형		B	0.85	2026-07-04	2026-07-04			cpp programming-language w3schools enums	https://www.w3schools.com/cpp/cpp_enum.asp

CPP Enumeration (enum)

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

• enum — a type representing a group of named, unchangeable constants. [S1]
• Default numbering — first item is 0, second is 1, etc. [S1]
• Forward-cascading custom values — setting one item's value shifts all subsequent unlabeled items to continue counting up from it. [S1]
• 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]

📖 세부 내용 (Details)

• Default numbering: enum Level { LOW, MEDIUM, HIGH }; enum Level myVar = MEDIUM; cout << myVar; // 1. [S1]
• Fully custom values: enum Level { LOW = 25, MEDIUM = 50, HIGH = 75 };. [S1]
• Cascading from one custom value: enum Level { LOW = 5, MEDIUM, HIGH }; — MEDIUM becomes 6, HIGH becomes 7. [S1]
• Enum used in a switch: enum Level myVar = MEDIUM; switch (myVar) { case 1: ... case 2: ... case 3: ... }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 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.

🛠️ 적용 사례 (Applied in summary)

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]

💻 코드 패턴 (Code patterns)

Setting one enum value causes subsequent items to cascade forward from it (C++):

enum Level {
  LOW = 5,
  MEDIUM, // Now 6
  HIGH    // Now 7
};

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.85
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: C++ Tutorial
• 관련 개념: CPP Structs, CPP Switch, CPP References, C Enums
• 참조 맥락: 구조체 및 열거형 섹션 마지막 — 참조·포인터·메모리(References, Pointers & Memory) 섹션으로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C++ Enumeration (enum) — https://www.w3schools.com/cpp/cpp_enum.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "C++ Enumeration (enum)" page (Astra wiki-curation, P-Reinforce v3.1 format).