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Top 23 C++ Reflection Projects
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Project mention: Focus: A simple and fast text editor written in Jai | news.ycombinator.com | 2023-09-02
https://pastebin.com/VPypiitk This is a very small experiment i did to learn the metaprogramming features. its an ECS library using the same model as entt (https://github.com/skypjack/entt). In 200 lines or so it does the equivalent of a few thousand lines of template heavy Cpp while compiling instantly and generating good debug code.
Some walkthrough:
Line 8 declares a SparseSet type as a fairly typical template. its just a struct with arrays of type T inside. Next lines implement getters/setters for this data structure
Line 46 Base_Registry things get interesting. This is a struct that holds a bunch of SparseSet of different types, and providers getters/setters for them by type. It uses code generation to do this. The initial #insert at the start of the class injects codegen that creates structure members from the type list the struct gets on its declaration. Note also how type-lists are a native structure in the lang, no need for variadics.
Line 99 i decide to do variadic style tail templates anyway for fun. I implement a function that takes a typelist and returns the tail, and the struct is created through recursion as one would do in cpp. Getters and setters for the View struct are also implemented through recursion
Line 143 has the for expansion. This is how you overload the for loop functionality to create custom iterators.
The rest of the code is just some basic test code that runs the thing.
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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
Project mention: What C++ library do you wish existed but hasn’t been created yet? | /r/cpp | 2023-07-08I'm not sure this is quite what you're asking for, but this library has been super helpful to me in the past : https://github.com/Neargye/magic_enum
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InfluxDB
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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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I really like better_enums instead of magic_enums. There’s no limit on enum size with it: http://aantron.github.io/better-enums/
It was heavily used at a former employer of mine, so definitely a solid production-ready solution.
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This single feature opens a world of new possiblities. For example, it makes implementing "getting the number of fields" trivial. Furthrmore, and much more importantly, it enables turning a struct into a tuple. Currently, this can only be done by enumerating cases (therefore it's not fully generic), as with Boost PFR. By the way, PFR greatly simplifies our codebases, especially for parts with serialization and/or reflection.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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refl-cpp
Static reflection for C++17 (compile-time enumeration, attributes, proxies, overloads, template functions, metaprogramming).
Project mention: Out of bounds memory access in V8 in Google Chrome prior to 120.0.6099.224 | news.ycombinator.com | 2024-01-25You'd be surprised how much friction you'd have for C++ reflection. First, since it's a custom build step, you can do a mix of custom code gen and C++ constexpr/consteval for static reflection. Here's a header-only implementation for adding compile time reflection purely within the language [1]. And v8 already does dynamic code gen as part of its build process (to generate the snapshot to speedup instantiation of the isolate). Dynamic reflection is a must since JS is a dynamic language with reflection support.
Now of course, I don't know the specific details of reflection needed for the abstractions you reference and clearly V8 is still doing some amount of manual IR generation, so it's possible it would be a substantial investment to actually retrofit those techniques into v8. One would have to do a careful analysis of historical security exploits & specific techniques and their ability to prevent to figure out if it's worth adding those abstractions (especially since there is a potential performance tradeoff as you mention). As I said, I think there's insufficient research in this area to establish a compelling body of best practices (not to take away from the contributions of the GraalJS team to this space).
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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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Project mention: A basic reflection-like system for editing object fields in a C++ game engine | /r/cpp_questions | 2023-05-23
You can look at it here. If you want to know more about the implementation details, you can read about it here.
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SaaSHub
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C++ Reflection related posts
- Out of bounds memory access in V8 in Google Chrome prior to 120.0.6099.224
- Rooting for P1061 "Structured Bindings can introduce a Pack"
- What C++ library do you wish existed but hasn’t been created yet?
- A basic reflection-like system for editing object fields in a C++ game engine
- enum_name (yet another enum to/from string conversion utility >=C++11)
- what is the best API for serialization?
- Behind the magic of magic_enum
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Index
What are some of the best open-source Reflection projects in C++? This list will help you:
Project | Stars | |
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1 | entt | 9,351 |
2 | Magic Enum C++ | 4,314 |
3 | rttr | 2,943 |
4 | Nameof C++ | 1,919 |
5 | cista | 1,606 |
6 | Better Enums | 1,581 |
7 | pfr | 1,250 |
8 | refl-cpp | 986 |
9 | glaze | 843 |
10 | structopt | 450 |
11 | alpaca | 409 |
12 | avendish | 403 |
13 | Refureku | 199 |
14 | RareCpp | 113 |
15 | meta.hpp | 112 |
16 | serdepp | 94 |
17 | easy_reflection_cpp | 87 |
18 | metapp | 76 |
19 | pfr_non_boost | 57 |
20 | enum.hpp | 42 |
21 | enum_name | 19 |
22 | reflect | 14 |
23 | reflite | 9 |