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    CPP Engineering

    1

    Build and refactor production-ready C++ using modern RAII, safer memory management, and C++20 standards.

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    CPP Engineering

    CPP Engineering

    Example session with this skill installed

    Refactor this ResourcePool class to use modern RAII and C++20 standards. It currently uses raw pointers and manual delete in the destructor, which is causing leaks during exceptions.

    • Read your context and instructions
    • Compiled the cpp engineering

    I have refactored the ResourcePool class to eliminate raw pointers and manual memory management. By using std::unique_ptr with a custom deleter and std::vector, we ensure exception safety and clear ownership.

    Refactored ResourcePool

    #include <memory>
#include <vector>
#include <expected>
#include <span>
#include <stdexcept>

class RawResource {
public:
    void initialize();
    void release();
};

// Modern RAII wrapper for the underlying resource
struct ResourceDeleter {
    void operator()(RawResource* res) const {
        if (res) {
            res->release();
            delete res;
        }
    }
};

using ResourcePtr = std::unique_ptr<RawResource, ResourceDeleter>;

class ResourcePool {
public:
    explicit ResourcePool(size_t initial_size) {
        m_resources.reserve(initial_size);
        for (size_t i = 0; i < initial_size; ++i) {
            auto res = ResourcePtr(new RawResource());
            res->initialize();
            m_resources.push_back(std::move(res));
        }
    }

    // C++20 span for safe view of managed resources
    std::span<const ResourcePtr> get_resources() const noexcept {
        return m_resources;
    }

    void add_resource(ResourcePtr res) {
        if (!res) throw std::invalid_argument("Cannot add null resource");
        m_resources.push_back(std::move(res));
    }

private:
    std::vector<ResourcePtr> m_resources;
};

    Next steps

    1. Update your CMakeLists.txt to ensure the -std=c++20 flag is enabled.
    2. Run your existing unit tests to verify that release() is called correctly during pool destruction.
    3. Integrate std::expected if you need to handle initialization failures without throwing exceptions.

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    About this skill

    Managing C++ memory safety and pointer ownership manually often leads to leaks, race conditions, and fragile abstractions. This skill enforces modern C++ standards to ensure your systems code, libraries, and native applications remain stable and maintainable.

    What it does

    • Memory Safety Management implemented through RAII, value semantics, and smart pointer ownership to eliminate raw memory leaks.
    • Modern Standards Compliance ensuring code aligns with C++20 or your specific project standard level.
    • Code Refactoring that simplifies template complexity and replaces macro-heavy abstractions with standard library facilities.
    • Performance Profiling focusing on data layout, allocation reduction, and algorithmic efficiency over micro-optimizations.
    • Error Diagnosis targeting undefined behavior, concurrency issues, and ABI boundaries for stable production deployments.

    How it works

    1. System Audit where the agent identifies the compiler, build system, and target platform constraints.
    2. Safety Review to inspect existing warning settings, sanitizers, and ownership patterns.
    3. Implementation of changes using modern C++ features with a focus on clear lifetime management.
    4. Validation through existing project build tools, test suites, and static analysis.

    Frameworks & tools

    The skill is designed for modern C++ (C++11 through C++20) and works with standard build systems like CMake or Meson. It assumes access to standard compiler toolchains like GCC, Clang, or MSVC.

    Why this beats prompting it yourself

    Generic AI often suggests legacy C-style patterns or over-engineered template metaprogramming. This skill applies a specific hierarchy of correctness first, followed by maintainability, then performance, ensuring you don't trade safety for premature optimizations.

    Use cases

    • Migrating legacy C-style memory management to modern RAII containers.
    • Debugging intermittent crashes related to object lifetime or undefined behavior.
    • Optimizing data structures for better cache locality and reduced heap allocations.
    • Standardizing a library interface to use explicit ownership and safer concurrency.

    Known limitations

    Requires an existing build system and test suite for validation. Does not support embedded assembly or non-standard compiler extensions.

    How to use

    Skills on Agensi run inside your AI agent. Copy the prompt, paste it into your agent, and it connects to Agensi and installs this skill for you. If a payment is needed, your agent shows it to you first.

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