Expert in C/C++ Coding-AI-powered C/C++ coding assistance.

Example

Transforming C-style resource management to C++ RAII: replace manual malloc/free pairs with std::unique_ptr<T[]> or small custom RAII wrapper; convert macros and raw arrays to constexpr and std::array/std::vector; replace error-code patterns with std::optional/std::expected where clarity and type safety help.

Scenario

A team maintaining a 10-year-old codebase suffers memory leaks and duplicated cleanup logic. The expert proposes incremental refactors: introduce unique_ptr for owning allocations, scoped guard objects for cleanup in error paths, and unit tests for refactored modules. It supplies concrete diffs, test patterns, and a migration plan (module-by-module) minimizing integration risk.

Example

Profile-guided optimization recommendations: identify hot functions with sampling profilers (perf/VTune), replace virtual polymorphism in hot loops with template-based static polymorphism, restructure data using struct-of-arrays (SoA) to improve SIMD vectorization, and suggest compiler flags (LTO, -march, PGO) with caveats about portability.

Scenario

A finance application has unpredictable latency spikes. The expert helps instrument code with lightweight tracing, pin threads to CPUs, lower syscalls, and replace a generic container with a cache-aware ring buffer. It provides benchmark harness code, microbenchmarks contrasting before/after, and guidance on measuring effects in production safely.

Example

Detect and fix undefined behavior patterns: explain signed-integer overflow, use of dangling references, iterator invalidation rules; recommend using std::span for non-owning views and gsl::not_null for pointer intent; convert raw thread-handling to std::thread + std::mutex/condition_variable or higher-level abstractions (std::async, thread pools, task queues), and show examples of lock-free idioms using std::atomic with correct memory order semantics.

Scenario

A multi-threaded image-processing pipeline produces sporadic crashes under load. The expert walks through data ownership, identifies race conditions via deterministic stress tests and sanitizer logs (ASAN/TSAN/UBSAN), prescribes a redesign using message passing and immutable buffers between stages, and supplies annotated code showing proper synchronization and memory-order justification.