C++ Code Review

This command invokes the cpp-reviewer agent for comprehensive C++-specific code review.

What This Command Does

1. Identify C++ Changes: Find modified .cpp, .hpp, .cc, .h files via git diff
2. Run Static Analysis: Execute clang-tidy and cppcheck
3. Memory Safety Scan: Check for raw new/delete, buffer overflows, use-after-free
4. Concurrency Review: Analyze thread safety, mutex usage, data races
5. Modern C++ Check: Verify code follows C++17/20 conventions and best practices
6. Generate Report: Categorize issues by severity

When to Use

Use /cpp-review when:

• After writing or modifying C++ code
• Before committing C++ changes
• Reviewing pull requests with C++ code
• Onboarding to a new C++ codebase
• Checking for memory safety issues

Review Categories

CRITICAL (Must Fix)

• Raw new/delete without RAII
• Buffer overflows and use-after-free
• Data races without synchronization
• Command injection via system()
• Uninitialized variable reads
• Null pointer dereferences

HIGH (Should Fix)

• Rule of Five violations
• Missing std::lock_guard / std::scoped_lock
• Detached threads without proper lifetime management
• C-style casts instead of static_cast/dynamic_cast
• Missing const correctness

MEDIUM (Consider)

• Unnecessary copies (pass by value instead of const&)
• Missing reserve() on known-size containers
• using namespace std; in headers
• Missing [[nodiscard]] on important return values
• Overly complex template metaprogramming

Automated Checks Run

# Static analysis
clang-tidy --checks='*,-llvmlibc-*' src/*.cpp -- -std=c++17

# Additional analysis
cppcheck --enable=all --suppress=missingIncludeSystem src/

# Build with warnings
cmake --build build -- -Wall -Wextra -Wpedantic

Example Usage

User: /cpp-review

Agent:
# C++ Code Review Report

## Files Reviewed
- src/handler/user.cpp (modified)
- src/service/auth.cpp (modified)

## Static Analysis Results
✓ clang-tidy: 2 warnings
✓ cppcheck: No issues

## Issues Found

[CRITICAL] Memory Leak
File: src/service/auth.cpp:45
Issue: Raw `new` without matching `delete`
```cpp
auto* session = new Session(userId);  // Memory leak!
cache[userId] = session;

Fix: Use std::unique_ptr

auto session = std::make_unique<Session>(userId);
cache[userId] = std::move(session);

[HIGH] Missing const Reference File: src/handler/user.cpp:28 Issue: Large object passed by value

void processUser(User user) {  // Unnecessary copy

Fix: Pass by const reference

void processUser(const User& user) {

Summary

• CRITICAL: 1
• HIGH: 1
• MEDIUM: 0

Recommendation: ❌ Block merge until CRITICAL issue is fixed

## Approval Criteria

| Status | Condition |
|--------|-----------|
| ✅ Approve | No CRITICAL or HIGH issues |
| ⚠️ Warning | Only MEDIUM issues (merge with caution) |
| ❌ Block | CRITICAL or HIGH issues found |

## Integration with Other Commands

- Use `/cpp-test` first to ensure tests pass
- Use `/cpp-build` if build errors occur
- Use `/cpp-review` before committing
- Use `/code-review` for non-C++ specific concerns

## Related

- Agent: `agents/cpp-reviewer.md`
- Skills: `skills/cpp-coding-standards/`, `skills/cpp-testing/`