2nd/10_Wiki/Dev/Topic_CPP/CPP_List.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-list	C++ List	Programming_Language	draft	conceptual		std::list doubly linked list C++ C++ 리스트		B	0.86	2026-07-04	2026-07-04			cpp programming-language w3schools stl list	https://www.w3schools.com/cpp/cpp_list.asp

CPP List

🎯 한 줄 통찰 (One-line insight)

list is the STL container that most directly replaces what C programmers had to hand-build with struct Node { int data; Node* next; } — a linked list that grows anywhere and adds/removes at both ends cheaply — but in exchange for that flexibility it gives up random-access indexing entirely (no list[i]), so choosing between vector and list is choosing between C-array-like index speed versus C-linked-list-like two-ended growth, expressed here as a one-line design decision instead of a whole custom data structure. [S1]

🧠 핵심 개념 (Core concepts)

• list<type> name — declared like a vector, e.g. list<string> cars;, requires <list>. [S1]
• No index access — unlike vector, elements cannot be retrieved by [i] or .at(i); only .front() and .back() are available. [S1]
• Both-ends growth — .push_front() / .push_back() add at the beginning/end; .pop_front() / .pop_back() remove from the beginning/end — vectors only optimize the "back" side. [S1]
• .front() / .back() are also mutable — assigning to cars.front() = "Opel" changes the first element directly, since there's no index-based assignment. [S1]
• Looping restriction — a traditional indexed for loop combined with .size() does NOT work for lists (no cars[i]); only a for-each loop (or, later, an iterator) can traverse a list. [S1]
• .size() / .empty() — same semantics as vector. [S1]

📖 세부 내용 (Details)

• Declaration with initial values: list<string> cars = {"Volvo", "BMW", "Ford", "Mazda"};. [S1]
• Add: cars.push_front("Tesla"); cars.push_back("VW");. [S1]
• Remove: cars.pop_front(); cars.pop_back();. [S1]
• The page explicitly shows the broken indexed-loop attempt (for (int i = 0; i < cars.size(); i++) { cout << cars[i]; }) as something that will NOT compile, then gives the working for-each replacement. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 인덱스 접근 자체가 존재하지 않음: vector는 배열처럼 인덱스 접근이 가능했지만, list는 순차 연결 구조이기 때문에 인덱스 접근 자체가 언어 차원에서 불가능하다는 점이 이번 챕터에서 vector와의 핵심 차이로 명시됨. [S1]
• 양쪽 끝 삽입/삭제가 대칭적으로 지원됨: vector는 뒤쪽(push_back/pop_back)에만 최적화되어 있었지만, list는 앞/뒤 양쪽 모두 push_front/pop_front, push_back/pop_back으로 대칭적으로 지원한다는 점이 vector와 대비됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 자동차 이름 리스트의 양 끝에 원소를 추가/삭제하는 예제가 원문에서 제시됨. [S1]

💻 코드 패턴 (Code patterns)

List-specific operations unavailable on vector — both-ends push/pop (C++):

#include <list>
list<string> cars = {"Volvo", "BMW", "Ford", "Mazda"};

cars.push_front("Tesla");  // add at beginning
cars.push_back("VW");      // add at end
cars.pop_front();          // remove from beginning
cars.pop_back();           // remove from end

// No index access — must use for-each:
for (string car : cars) {
  cout << car << "\n";
}

✅ 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 Vectors, CPP Stacks, CPP Data Structures, C Pointers
• 참조 맥락: 데이터 구조(STL) 섹션 — Stacks 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C++ List — https://www.w3schools.com/cpp/cpp_list.asp

📝 변경 이력 (Change history)

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