describe

Minimal C++17 Reflection Library in 200! LOC.

Features

• Constexpr field pointer + name iteration
• Inheritance (NEW: Multiple inheritance)
• Enums support
• Templates support
• Friend (private variables) support
• Constexpr nonattributes for classes AND fields (NEW: extract-all)

Usage

Basic

struct Data {
    int a;
    int b;
    void method() {}
};

DESCRIBE("Data", Data) {
    MEMBER("renamed", &_::a);
    MEMBER("b", &_::b);
    MEMBER("method", &_::method);
}

template<typename T>
void print_fields(const T& d) {
    constexpr auto desc = describe::Get<T>();
    std::cout << desc.name << ": ";
    desc.for_each([&](auto f){
        if constexpr (f.is_field) {
            std::cout << f.name << " -> " << f.get(d) << ", ";
        }
    });
    std::cout << std::endl;
}

print_fields(Data{1, 2}); // Data: renamed -> 1, b -> 2, 

Inheritance

// Inherit
struct Parent {
    std::string a;
    std::string b;
};

DESCRIBE("Parent", Parent) {
    MEMBER("a", &_::a);
    MEMBER("b", &_::b);
}

struct Child : Parent {
    std::string c;
};


DESCRIBE("Child", Child) {
    PARENT(Parent);
    MEMBER("c", &_::c);
}