What does HackerNews think of cxx?

Firefox finally outperforming Google Chrome in SunSpider | Aug 2023

Chromium is fairly invested in cxx[0]. Firefox could do the same if they haven't already.

Build faster with Buck2: Our open source build system | Apr 2023

I have a non-toy multi-language project in https://github.com/dtolnay/cxx for which I have both Buck2 and Bazel build rules.

On my machine `buck2 clean && time buck2 build :cxx` takes 6.2 seconds.

`bazel clean && time bazel build :cxx` takes 19.9 seconds.

Rust and C++ Interoperability | Nov 2022

I have used CXX in a project where I had to use a library available only in C++. There were Python bindings but somehow they were very slow. I could have rolled out my own pybind11 but wanted some of the Rust guarantees.

It was probably more convoluted than necessary since I also then exposed the Rust lib to Python, so C++ <=> Rust <=> Python , but it was indeed fun to implement it all.

https://github.com/dtolnay/cxx

S2: Computational geometry and spatial indexing on the sphere | Mar 2022

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As a fun experiment, I wanted to use the library in Rust. While there isn't an official Rust port, I just used the library along with CXX (https://github.com/dtolnay/cxx) with a simple geospatial struct.

The Rustonomicon | May 2021

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There are tools to automatically generate "safe" C++-Rust bindings (the intent being to restrict unsafety to trusting C++ code to be sound, without the risk of screwing up the bindings): https://github.com/dtolnay/cxx and https://cxx.rs/.

However, creating bindings without typing out `unsafe` was a controversial issue, discussed at https://www.reddit.com/r/rust/comments/ielvxu/the_cxx_debate... .

Also there are tools to automatically parse C++ headers and turn them into cxx bindings: https://github.com/google/autocxx and https://docs.rs/autocxx/

Rust is for Professionals | Apr 2021

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Isn't this what the cxx project is aiming to do? https://github.com/dtolnay/cxx

Are we game yet? – A guide to the Rust game development ecosystem | Feb 2021

cxx [1] is a relatively recent effort to enable safe interop with C++.

Mozilla has also published information on how they are rewriting components in Rust and integrating them into the Firefox codebase, though they were using C apis - exposing Rust to C and vice versa is relatively straight-forward.

[1] https://github.com/dtolnay/cxx

State of Rust Survey 2020 results | Dec 2020

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See https://github.com/dtolnay/cxx as an example of the kind of things people are building to explore this space.

Ask HN: Should I learn C/C++ or Rust as my first systems programming language? | Oct 2020

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Making FFI calls to C is pretty easy and writing the FFI interface definitions can be completely automated with tools like bindgen [0]. Making FFI calls to C++ is a lot harder to do by hand, although cxx[1] is supposed to make doing so a lot easier as long as you can control the C++ end as well to be able to make it compatible with Rust Strings/Vectors/etc.

[0] https://github.com/rust-lang/rust-bindgen

[1] https://github.com/dtolnay/cxx

AutoCXX: Safely call C++ from Rust with auto generated bindings | Aug 2020

Probably a follow up on this one[0]. Also related to cxx's[1] (mentioned in chromium's original post[2])

[0]: https://news.ycombinator.com/item?id=24211691 [1]: https://github.com/dtolnay/cxx [2]: https://www.chromium.org/Home/chromium-security/memory-safet...

Rust and C++ Interoperability in Chrome | Aug 2020

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> If you really want to reduce the unsafe keyword from being seen in most regular code, you create and interface that maps the C++ function and exposes it as a rust function, and you've hidden away your unsafe usage to one spot per function.

Isn't that what they did? Through the use of https://github.com/dtolnay/cxx

Agreed the article expressed the concern in a rather clumsy manner, but they seem to have a point for their particular use case, and they addressed it appropriately.