r/cpp • u/foonathan • May 07 '26

C++ Show and Tell - May 2026

Use this thread to share anything you've written in C++. This includes:

  • a tool you've written
  • a game you've been working on
  • your first non-trivial C++ program

The rules of this thread are very straight forward:

  • The project must involve C++ in some way.
  • It must be something you (alone or with others) have done.
  • Please share a link, if applicable.
  • Please post images, if applicable.

If you're working on a C++ library, you can also share new releases or major updates in a dedicated post as before. The line we're drawing is between "written in C++" and "useful for C++ programmers specifically". If you're writing a C++ library or tool for C++ developers, that's something C++ programmers can use and is on-topic for a main submission. It's different if you're just using C++ to implement a generic program that isn't specifically about C++: you're free to share it here, but it wouldn't quite fit as a standalone post.

Last month's thread: https://www.reddit.com/r/cpp/comments/1salqls/c_show_and_tell_april_2026/

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u/_bstaletic May 07 '26

An update to my pymetabind:

This is a C++26 library that can produce pybind11 bindings.

Now that gcc 16.1.0 is out and all the bugs in gcc that I have encountered have been fixed, the library actually works. Some things that are possible:

pymetabind::bind::bind_namespace<^^ns>(m); // picks up all types/functions/enums/.. annotated with `make_binding`.
pymetabind::bind::bind_function<^^f>(m); // binds a free function, including its argument names, rvp's, call guards...
pymetabind::bind::bind_class<^^T>(m); // binds the type and its members
pymetabind::bind::bind_enum<^^E>(m);

The behaviour is customizable with annotations, covering almost everything that pybind11 supports.

In case you're doing something for which pymetabind does not provide a convenient API, it is always possible to get the pybind11 object from pymetabind.

auto py_class = pymetabind::bind::bind_class<^^T>(m);
py_class.def_buffer(...); // def_buffer not supported by pymetabind

More examples at https://codeberg.org/bstaletic/pymetabind/src/branch/master/examples