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133 lines
3.4 KiB
Markdown
133 lines
3.4 KiB
Markdown
---
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description: Comprehensive C++ code review for memory safety, modern C++ idioms, concurrency, and security. Invokes the cpp-reviewer agent.
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---
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# C++ Code Review
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This command invokes the **cpp-reviewer** agent for comprehensive C++-specific code review.
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## What This Command Does
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1. **Identify C++ Changes**: Find modified `.cpp`, `.hpp`, `.cc`, `.h` files via `git diff`
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2. **Run Static Analysis**: Execute `clang-tidy` and `cppcheck`
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3. **Memory Safety Scan**: Check for raw new/delete, buffer overflows, use-after-free
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4. **Concurrency Review**: Analyze thread safety, mutex usage, data races
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5. **Modern C++ Check**: Verify code follows C++17/20 conventions and best practices
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6. **Generate Report**: Categorize issues by severity
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## When to Use
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Use `/cpp-review` when:
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- After writing or modifying C++ code
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- Before committing C++ changes
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- Reviewing pull requests with C++ code
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- Onboarding to a new C++ codebase
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- Checking for memory safety issues
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## Review Categories
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### CRITICAL (Must Fix)
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- Raw `new`/`delete` without RAII
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- Buffer overflows and use-after-free
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- Data races without synchronization
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- Command injection via `system()`
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- Uninitialized variable reads
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- Null pointer dereferences
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### HIGH (Should Fix)
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- Rule of Five violations
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- Missing `std::lock_guard` / `std::scoped_lock`
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- Detached threads without proper lifetime management
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- C-style casts instead of `static_cast`/`dynamic_cast`
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- Missing `const` correctness
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### MEDIUM (Consider)
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- Unnecessary copies (pass by value instead of `const&`)
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- Missing `reserve()` on known-size containers
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- `using namespace std;` in headers
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- Missing `[[nodiscard]]` on important return values
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- Overly complex template metaprogramming
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## Automated Checks Run
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```bash
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# Static analysis
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clang-tidy --checks='*,-llvmlibc-*' src/*.cpp -- -std=c++17
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# Additional analysis
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cppcheck --enable=all --suppress=missingIncludeSystem src/
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# Build with warnings
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cmake --build build -- -Wall -Wextra -Wpedantic
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```
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## Example Usage
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```text
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User: /cpp-review
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Agent:
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# C++ Code Review Report
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## Files Reviewed
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- src/handler/user.cpp (modified)
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- src/service/auth.cpp (modified)
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## Static Analysis Results
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✓ clang-tidy: 2 warnings
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✓ cppcheck: No issues
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## Issues Found
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[CRITICAL] Memory Leak
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File: src/service/auth.cpp:45
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Issue: Raw `new` without matching `delete`
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```cpp
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auto* session = new Session(userId); // Memory leak!
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cache[userId] = session;
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```
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Fix: Use `std::unique_ptr`
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```cpp
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auto session = std::make_unique<Session>(userId);
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cache[userId] = std::move(session);
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```
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[HIGH] Missing const Reference
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File: src/handler/user.cpp:28
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Issue: Large object passed by value
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```cpp
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void processUser(User user) { // Unnecessary copy
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```
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Fix: Pass by const reference
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```cpp
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void processUser(const User& user) {
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```
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## Summary
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- CRITICAL: 1
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- HIGH: 1
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- MEDIUM: 0
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Recommendation: FAIL: Block merge until CRITICAL issue is fixed
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```
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## Approval Criteria
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| Status | Condition |
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|--------|-----------|
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| PASS: Approve | No CRITICAL or HIGH issues |
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| WARNING: Warning | Only MEDIUM issues (merge with caution) |
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| FAIL: Block | CRITICAL or HIGH issues found |
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## Integration with Other Commands
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- Use `/cpp-test` first to ensure tests pass
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- Use `/cpp-build` if build errors occur
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- Use `/cpp-review` before committing
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- Use `/code-review` for non-C++ specific concerns
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## Related
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- Agent: `agents/cpp-reviewer.md`
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- Skills: `skills/cpp-coding-standards/`, `skills/cpp-testing/`
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