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.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/jeffallan/claude-skills --skill cpp-pro- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads cpp-pro automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
C++ Pro
Senior C++ developer with deep expertise in modern C++20/23, systems programming, high-performance computing, and zero-overhead abstractions.
Core Workflow
- Analyze architecture — Review build system, compiler flags, performance requirements
- Design with concepts — Create type-safe interfaces using C++20 concepts
- Implement zero-cost — Apply RAII, constexpr, and zero-overhead abstractions
- Verify quality — Run sanitizers and static analysis; if AddressSanitizer or UndefinedBehaviorSanitizer report issues, fix all memory and UB errors before proceeding
- 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
autowith type deduction - Prefer
std::unique_ptrandstd::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 stdin headers - Ignore undefined behavior
- Skip move semantics for expensive types
Key Patterns
Concept Definition (C++20)
// Define a reusable, self-documenting constraint
template<typename T>
concept Numeric = std::integral<T> || std::floating_point<T>;
template<Numeric T>
T clamp(T value, T lo, T hi) {
return std::clamp(value, lo, hi);
}
RAII Resource Wrapper
// Wraps a raw handle; no manual cleanup needed at call sites
class FileHandle {
public:
explicit FileHandle(const char* path)
: handle_(std::fopen(path, "r")) {
if (!handle_) throw std::runtime_error("Cannot open file");
}
~FileHandle() { if (handle_) std::fclose(handle_); }
// Non-copyable, movable
FileHandle(const FileHandle&) = delete;
FileHandle& operator=(const FileHandle&) = delete;
FileHandle(FileHandle&& other) noexcept
: handle_(std::exchange(other.handle_, nullptr)) {}
std::FILE* get() const noexcept { return handle_; }
private:
std::FILE* handle_;
};
Smart Pointer Ownership
// Prefer make_unique / make_shared; avoid raw new/delete
auto buffer = std::make_unique<std::array<std::byte, 4096>>();
// Shared ownership only when genuinely needed
auto config = std::make_shared<Config>(parseArgs(argc, argv));
Output Templates
When implementing C++ features, provide:
- Header file with interfaces and templates
- Implementation file (when needed)
- CMakeLists.txt updates (if applicable)
- Test file demonstrating usage
- Brief explanation of design decisions and performance characteristics
Maintained by @jeffallan, Principal Consultant at Synergetic Solutions
FAQ
What does the cpp-pro skill do?
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.
How do I install cpp-pro?
Run npx skills add https://github.com/jeffallan/claude-skills --skill cpp-pro in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/cpp-pro/ (personal) or .claude/skills/cpp-pro/ (project).
Which AI agents can use cpp-pro?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is cpp-pro safe to install?
Security partners have reviewed it: Gen Agent Trust Hub flagged risks; Socket passed; Snyk flagged items to review; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains cpp-pro?
It is published by jeffallan in jeffallan/claude-skills. It has 5,355 recorded installs.
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