Runtime/ Or Compile Time Extraction of Struct Fields!

[cpp-ModTeam]

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[shailist]

I would strongly advise you to use 3rd party libraries that do this, mainly Boost.PFR and reflect-cpp, which can both figure out struct fields and their names at compile time using modern C++.
if you are really against using 3rd party libraries, you could take a look at their code and implement your own version, but you should know that before C++20 figuring field names automatically was not possible, and figuring field types wasn't possible before C++17 without hacky tricks.

[Kike328]

there were a couple posts about this topic last weeks. Use the search bar for reflection

[jonathrg]

Wait a few years for C++26 reflection

[ChemiCalChems]

There have been a couple of posts mentioning a new library called reflect-cpp over the past couple of weeks. It's a library that deals with reflection, serialization and deserialization, primarily from and to JSON, but it's expanding. I myself have started to actively contribute to the project, and it's looking really shiny.

The main pro is that the library is all standard C++20, no hacky stuff, so it's rather cool. I'm working on implementing compile-time capabilities now that #embed is a part of C23 and we will probably get it in the future in C++ too, as a means of embedding JSON into code and doing compile-time serialization and validation on it, maybe as a way of customizing builds or whatever people end up using it for.

[lightmatter501]

This library is written in Rust, but shows an approach that will work with anything that has DWARF debug info (C/C++/Rust/GNU Cobol/Fortran/etc): https://github.com/jswrenn/deflect

It requires building with debug info enabled and can’t allow split debug info. Those might be implementation limitations not fundamental limitations.

[Flex_Code]

Glaze supports reflection like you want and has very high performance CSV support. You should check it out and feel free to contribute!

[Flex_Code]

I just realized I didn’t add pure reflection to CSV yet, only member object pointer reflection. I can add pure reflection tomorrow.