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Top 23 C++ Reflection Projects
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Magic Enum C++
Static reflection for enums (to string, from string, iteration) for modern C++, work with any enum type without any macro or boilerplate code
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Nameof C++
Nameof operator for modern C++, simply obtain the name of a variable, type, function, macro, and enum
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Project mention: Enum class improvements for C++17, C++20 and C++23 | news.ycombinator.com | 2024-08-04
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refl-cpp
Static reflection for C++17 (compile-time enumeration, attributes, proxies, overloads, template functions, metaprogramming).
Project mention: Abusing C to Implement JSON Parsing with Struct Methods | news.ycombinator.com | 2025-03-01It's definitively different than Frunk, the library is not a general-purpose functional toolkit. One could certainly implement it with Zig's compile-time reflection with ease (don't know much about D). Actually, it's superficially similar to refl-cpp's serialization example [1], but with far less templating magic underneath due to the restricted scope.
[1] https://github.com/veselink1/refl-cpp/blob/master/examples/e...
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alpaca
Serialization library written in C++17 - Pack C++ structs into a compact byte-array without any macros or boilerplate code (by p-ranav)
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Check out boost.pfr, it gets you there for a lot of cases. Here's a library I built with it: https://github.com/celtera/avendish
It's a proper quantum leap compared to pre-reflection
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The question is - Can we do better? And if so, what are the trade-offs? All in all, wouldn't be great to be able to write the same code for run-time and compile-time and/or debug compile-time code at run-time?
Reflection for C++ - https://wg21.link/P2996 - introduced a new meta-programming model which is value/consteval based and can greatly improve the experience. Together with reflection is a very powerful combination but it also has its own set of trade-offs such as slower compilation-times.
This post is about `mp` - https://github.com/boost-ext/mp - meta-programming library which supports - similar to P2996 - meta-programming model for easier transition as it supports C++20 (msvc, gcc, clang), has a bit faster compilation times than P2996, but mostly, it makes meta-programming a 'normal' C++. In the mp world no difference between run-time and compile-time, whole standard library can be leveraged and it has reflection integration with C++20 using https://github.com/boost-ext/reflect. Of course it has it own set of trade-offs but, IMHO, it has a lot of potential and it's super fan.
> Example (API)
// mp::meta -
and in most of the special-cased code in generate_canonical() you return a number in the semi-open interval [0, 1). I didn't take the time to assess the correctness of _generate_canonical_generic(), but given that it wasn't purposely generating 1.0, I wouldn't expect it to be uniformly distributed in the interval [0, 1].
* I say trying because multiplying by (b-a) and adding a introduces rounding errors.
[1]: https://github.com/DmitriBogdanov/UTL/blob/master/docs/modul...
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Project mention: 🚀Announcing conjure_enum - a C++20 enum and typename reflection Library | dev.to | 2024-07-31
We're pleased to announce the release of conjure_enum, a lightweight header-only C++20 library designed to streamline working with enums and typenames by providing simple reflection capability.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ Reflection discussion
C++ Reflection related posts
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C++20 – Back to the Future Meta-Programming
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Out of bounds memory access in V8 in Google Chrome prior to 120.0.6099.224
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Rooting for P1061 "Structured Bindings can introduce a Pack"
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What C++ library do you wish existed but hasn’t been created yet?
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A basic reflection-like system for editing object fields in a C++ game engine
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enum_name (yet another enum to/from string conversion utility >=C++11)
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what is the best API for serialization?
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A note from our sponsor - SaaSHub
www.saashub.com | 24 Jun 2025
Index
What are some of the best open-source Reflection projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | entt | 11,199 |
| 2 | Magic Enum C++ | 5,484 |
| 3 | rttr | 3,298 |
| 4 | Nameof C++ | 2,203 |
| 5 | cista | 2,036 |
| 6 | glaze | 1,913 |
| 7 | Better Enums | 1,753 |
| 8 | pfr | 1,401 |
| 9 | refl-cpp | 1,138 |
| 10 | alpaca | 519 |
| 11 | structopt | 492 |
| 12 | avendish | 445 |
| 13 | reflect | 433 |
| 14 | UTL | 289 |
| 15 | Refureku | 242 |
| 16 | meta.hpp | 136 |
| 17 | RareCpp | 124 |
| 18 | metapp | 122 |
| 19 | serdepp | 109 |
| 20 | easy_reflection_cpp | 102 |
| 21 | pfr_non_boost | 72 |
| 22 | conjure_enum | 58 |
| 23 | enum.hpp | 44 |
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