11 unstable releases (5 breaking)

0.7.1 Feb 14, 2024
0.7.0 Nov 15, 2023
0.6.0 Sep 21, 2023
0.5.2 Apr 28, 2023
0.2.0 Aug 2, 2021

#983 in Development tools

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16K SLoC


Diplomat is an experimental Rust tool for generating FFI definitions allowing many other languages to call Rust code. With Diplomat, you can simply define Rust APIs to be exposed over FFI and get high-level C, C++, and JavaScript bindings automatically!

Diplomat supports languages through a plugin interface that makes it easy to add support for your favourite language. See tool/src/{c, cpp, js} for examples of existing language plugins.


First, install the CLI tool for generating bindings:

$ cargo install diplomat-tool

Then, add the Diplomat macro and runtime as dependencies to your project:

diplomat = "0.4.0"
diplomat-runtime = "0.4.0"

Getting Started

Documentation on how to use Diplomat can be found in the book.


See the design doc for more details.

Building and Testing

Simply run cargo build to build all the libraries and compile an example. To run unit tests, run cargo test.

Diplomat makes use of snapshot tests to check macro and code generation logic. When code generation logic changes and the snapshots need to be updated, run cargo insta review (run cargo install cargo-insta to get the tool) to view the changes and update the snapshots.


~146K SLoC