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10_Wiki/Dev/Topic_CPP/CPP_Deque.md

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+---
+id: cpp-deque
+title: "C++ Deque"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["std::deque", "double-ended queue C++", "C++ 데크"]
+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", "stl", "deque"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_deque.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP Deque]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`deque` is what queue "should have been" if index access mattered — it takes queue's both-ends-conceptual-flexibility one step further by ALSO allowing `[]`/`.at()` indexing like vector, meaning deque is effectively "vector + list's both-ends growth combined," and its existence exposes that the earlier stack/queue restrictions (no brace-init, single/dual access points) were deliberate design trade-offs rather than technical limitations of the "add/remove from ends" idea itself. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Deque = double-ended queue** — unlike a plain queue (front removal, back insertion only), a deque allows adding AND removing from BOTH ends. [S1]
+- **Index access restored** — unlike stack/queue/list, a deque supports `[]` and `.at()` just like vector, combining both-ends flexibility with random access. [S1]
+- **Brace-initialization allowed** — unlike stack/queue, `deque<string> cars = {"Volvo", "BMW", "Ford", "Mazda"};` works directly, matching vector/list syntax. [S1]
+- **`.push_front()` / `.push_back()`, `.pop_front()` / `.pop_back()`** — identical method names to `list`, giving deque list's symmetric growth PLUS vector's indexing. [S1]
+- **`.front()` / `.back()`, `.size()` / `.empty()`** — same as every other sequence container covered so far. [S1]
+- **Looping** — both indexed `for` + `.size()` and for-each work, exactly like vector (unlike list, which only supports for-each). [S1]
+
+## 📖 세부 내용 (Details)
+- Access: `cars[0]`, `cars.front()`, `cars.back()`, `cars.at(1)` — same safety trade-off as vector (`.at()` throws on out-of-range, `[]` does not). [S1]
+- Add/remove at both ends: `cars.push_front("Tesla"); cars.push_back("VW"); cars.pop_front(); cars.pop_back();`. [S1]
+- Both loop styles supported: indexed `for (int i = 0; i < cars.size(); i++)` AND for-each `for (string car : cars)`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **stack/queue의 제약이 deque에는 적용되지 않음**: stack과 queue는 선언 시 중괄호 초기화가 불가능했지만, deque는 vector/list와 동일하게 `= {...}`로 즉시 초기화가 가능하다는 점이 이번 챕터에서 확인됨 — 앞서의 제약이 "양 끝 삽입/삭제 컨테이너의 본질"이 아니라 설계 선택이었음을 보여줌. [S1]
+- **인덱스 접근과 양쪽 끝 성장이 동시에 가능해짐**: list는 양쪽 끝 성장은 가능했지만 인덱스 접근이 불가능했고, queue/stack은 인덱스 접근도 양쪽 끝 임의 접근도 안 됐지만, deque는 이 둘을 모두 갖춘 컨테이너로 확인됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 자동차 이름 deque에 인덱스 접근, 양 끝 push/pop, 순회를 모두 적용하는 예제가 원문에서 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Deque combines vector's indexing with list's both-ends growth (C++):
+```cpp
+#include <deque>
+deque<string> cars = {"Volvo", "BMW", "Ford", "Mazda"};
+
+cout << cars[0];            // indexed access, like vector
+cars.push_front("Tesla");   // both-ends growth, like list
+cars.push_back("VW");
+cars.pop_front();
+cars.pop_back();
+
+for (int i = 0; i < cars.size(); i++) {  // indexed loop works too
+  cout << cars[i] << "\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 Queues]], [[CPP Vectors]], [[CPP List]], [[CPP Sets]]
+- **참조 맥락:** 데이터 구조(STL) 섹션 — Sets 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ Deque — https://www.w3schools.com/cpp/cpp_deque.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Deque" page (Astra wiki-curation, P-Reinforce v3.1 format).