Antigravity Agent
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10_Wiki/Topics 대규모 정리: - 오류 캡처/미완성 stub 문서 227개 제거 - 교차폴더 중복 43클러스터 병합 (63파일 → redirect) - 링크명 정규화: 깨진 링크 수정·redirect 직결·개념 매핑 ~2,400건 - 카테고리 MOC 6개 신규 생성 - Graph 섹션 미해결 related-keyword 링크 10,058건 제거 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
154 lines
4.5 KiB
Markdown
154 lines
4.5 KiB
Markdown
---
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id: wiki-2026-0508-vfunction
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title: vFunction
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [virtual function, 가상 함수, vFunction.com]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [oop, polymorphism, architecture, modernization]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: cpp
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framework: none
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---
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# vFunction
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## 매 한 줄
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> **"매 dispatch 의 runtime 의 resolve"**. 매 term 의 two meanings — (1) C++ `virtual` function (vtable-based dynamic dispatch), (2) vFunction.com (AI-driven Java monolith → microservices modernization platform). 매 context 의 disambiguate.
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## 매 핵심
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### 매 (1) Virtual function (C++)
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- **vtable**: 매 class per — function pointer table.
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- **vptr**: 매 instance per — vtable 의 pointer.
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- **Dispatch**: `obj->fn()` → `obj->vptr[fn_index]()` (one extra indirection).
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- **Cost**: ~1-2 ns per call, 매 inlining 의 block.
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- **Override**: derived class 의 same signature 의 redefine.
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### 매 (2) vFunction.com platform
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- **Static + dynamic analysis**: 매 Java/.NET monolith 의 scan.
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- **Domain extraction**: AI 의 bounded context 의 cluster.
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- **Refactor recommendation**: 매 service boundary + dead code + TCO.
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- **2025 update**: Claude/GPT-5 backed reasoning, 매 Spring Boot extraction template.
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### 매 응용 (vfunc C++)
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1. Strategy pattern.
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2. Plugin/driver interface.
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3. Mock injection 의 testing.
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### 매 응용 (vFunction.com)
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1. Legacy Java EE → microservice migration.
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2. Technical debt quantification.
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3. Architectural drift detection.
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## 💻 패턴
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### Virtual function (modern C++20)
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```cpp
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struct Shape {
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virtual ~Shape() = default;
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virtual double area() const = 0; // pure virtual
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};
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struct Circle : Shape {
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double r;
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explicit Circle(double r) : r(r) {}
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double area() const override { return 3.14159 * r * r; }
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};
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double total(std::span<const std::unique_ptr<Shape>> shapes) {
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double s = 0;
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for (auto& sh : shapes) s += sh->area(); // dynamic dispatch
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return s;
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}
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```
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### Devirtualization hint (final)
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```cpp
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struct FastCircle final : Shape { // final → compiler 의 devirtualize
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double area() const override final { return 3.14; }
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};
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```
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### CRTP (static polymorphism, vfunc 의 X)
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```cpp
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template<class Derived>
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struct Shape {
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double area() const { return static_cast<const Derived*>(this)->area_impl(); }
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};
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struct Square : Shape<Square> {
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double s;
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double area_impl() const { return s * s; } // zero overhead
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};
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```
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### Rust (trait object, vfunc analog)
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```rust
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trait Shape { fn area(&self) -> f64; }
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struct Circle { r: f64 }
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impl Shape for Circle { fn area(&self) -> f64 { 3.14 * self.r * self.r } }
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fn total(shapes: &[Box<dyn Shape>]) -> f64 {
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shapes.iter().map(|s| s.area()).sum() // dyn dispatch via vtable
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}
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```
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### vFunction.com workflow (concept)
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```yaml
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# .vfunction/config.yaml
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target: java/spring-boot
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analyze:
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paths: [src/main/java]
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exclude: [test, generated]
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extract:
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strategy: domain-driven
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min-cohesion: 0.7
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recommendations:
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- service-boundaries
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- dead-code
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- dependency-cycles
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```
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| Runtime polymorphism, OOP | virtual function |
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| Hot loop, type known | CRTP / template |
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| Plugin boundary | virtual + dyn lib |
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| Legacy Java refactor | vFunction.com |
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| Greenfield modular | DDD + bounded context |
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**기본값**: virtual function 의 default OOP, CRTP 의 perf-critical.
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## 🔗 Graph
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- 부모: [[Object-Oriented-Programming]] · [[Polymorphism]]
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- Adjacent: [[Legacy Modernization]]
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## 🤖 LLM 활용
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**언제**: legacy code 의 virtual function chain 의 analyze, 매 modernization scope 의 estimate.
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**언제 X**: 매 micro-optimization decision (devirtualize 의 X) — 매 profiler 의 use.
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## ❌ 안티패턴
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- **Virtual everything**: 매 every method 의 virtual, 의 cost + 의 hard 의 reason. Final 의 default.
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- **Diamond inheritance**: 매 multiple virtual base, 의 composition 의 prefer.
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- **Virtual destructor 의 forget**: base class polymorphic, 의 leak.
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- **vFunction 의 silver bullet**: tool 의 recommendation 의 blindly 의 apply, 의 domain understanding 의 first.
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## 🧪 검증 / 중복
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- Verified (ISO C++ standard, Stroustrup "Tour of C++" 3rd, vfunction.com docs 2025).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — full vFunction (virtual + platform) entry |
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