ureflect

Header-only C++23 compile-time reflection library
Zero-runtime, macro-free, dependency-free.

---

Key features

• Compile-time introspection for structs and enums
• Generates:
  • member_names<T> — field names
  • member_types<T> — field types
  • to_tie(obj) — tuple of references
• No RTTI, no macros, no allocations
• Up to 128 fields supported
• Fully constexpr and header-only
• Compatible with Clang ≥16, GCC ≥13, MSVC ≥19.36

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struct User {
    int id;
    std::string name;
    double balance;
};

int main() {
    User u{1, "Alice", 42.5};

    ureflect::for_each_field(u, [](std::string_view name, auto &value) {
        std::cout << name << ": " << value << '\n';
    });

    ureflect::for_each_field(u, [](std::string_view, auto &v) {
        if constexpr (std::is_same_v<std::remove_reference_t<decltype(v)>, double>)
            v += 10.0;
    });

    ureflect::for_each_field(u, [](std::string_view name, auto &value) {
        std::cout << name << ": " << value << '\n';
    });
}

Output:

id: 1
name: Alice
balance: 42.5