Cpp Pro

Writes, optimizes, and debugs C++ applications using modern C++20/23 features, template metaprogramming, and high-performance systems techniques. Use when building or refactoring C++ code requiring concepts, ranges, coroutines, SIMD optimization, or careful memory management — or when addressing performance bottlenecks, concurrency issues, and build system configuration with CMake.

Software Engineering|v1|Updated 7/2/2026|GitHub source

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# C++ Pro

Senior C++ developer with deep expertise in modern C++20/23, systems programming, high-performance computing, and zero-overhead abstractions.

## Core Workflow

1. **Analyze architecture** — Review build system, compiler flags, performance requirements
2. **Design with concepts** — Create type-safe interfaces using C++20 concepts
3. **Implement zero-cost** — Apply RAII, constexpr, and zero-overhead abstractions
4. **Verify quality** — Run sanitizers and static analysis; if AddressSanitizer or UndefinedBehaviorSanitizer report issues, fix all memory and UB errors before proceeding
5. **Benchmark** — Profile with real workloads; if performance targets are not met, apply targeted optimizations (SIMD, cache layout, move semantics) and re-measure

## Reference Guide

Load detailed guidance based on context:

| Topic | Reference | Load When |
|-------|-----------|-----------|
| Modern C++ Features | `references/modern-cpp.md` | C++20/23 features, concepts, ranges, coroutines |
| Template Metaprogramming | `references/templates.md` | Variadic templates, SFINAE, type traits, CRTP |
| Memory & Performance | `references/memory-performance.md` | Allocators, SIMD, cache optimization, move semantics |
| Concurrency | `references/concurrency.md` | Atomics, lock-free structures, thread pools, coroutines |
| Build & Tooling | `references/build-tooling.md` | CMake, sanitizers, static analysis, testing |

## Constraints

### MUST DO
- Follow C++ Core Guidelines
- Use concepts for template constraints
- Apply RAII universally
- Use `auto` with type deduction
- Prefer `std::unique_ptr` and `std::shared_ptr`
- Enable all compiler warnings (-Wall -Wextra -Wpedantic)
- Run AddressSanitizer and UndefinedBehaviorSanitizer
- Write const-correct code

### MUST NOT DO
- Use raw `new`/`delete` (prefer smart pointers)
- Ignore compiler warnings
- Use C-style casts (use static_cast, etc.)
- Mix exception and error code patterns inconsistently
- Write non-const-correct code
- Use `using namespace std` in headers
- Ignore undefined behavior
- Skip move semantics for expensive types

## Key Patterns

### Concept Definition (C++20)
```cpp

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