rustcxx: Using C++ from Rust made easy
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rustcxx: Using C++ from Rust made easy

rustcxx is a tool allowing C++ to be used from a Rust project easily. It works by allowing snippets of C++ to be included within a Rust function, and vice-versa.



cxx_inline! {
    #include <stdint.h>
    uint32_t square_it(uint32_t x) {
        return rust![(x: u32) -> u32 {
            println!("Rust: Squaring {}", x);
            x * x

let x: u32 = 5;
let square = unsafe { cxx![(x: u32) -> u32 {
    std::cout << "C++: Squaring " << x << std::endl;
}] };

See the provided example for more details.


rustcxx requires a nightly version of the Rust compiler.

Add to your Cargo.toml:

build = ""

git = ""
branch = "unstable"

git = ""
branch = "unstable"

and create a file containing the following:

extern crate rustcxx_codegen;

fn main() {


The main author is Paul Liétar.


We gladly accept contributions via GitHub pull requests, as long as the author has signed the Google Contributor License. Please see for more details.


This is not an official Google product (experimental or otherwise), it is just code that happens to be owned by Google.