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Toy example of calling Rust from Haskell
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Makefile Updated with more test information Jan 13, 2015 Updated documentation, as it no longer uses unstable features and als… Jun 10, 2015 git-ified current state Jan 13, 2015
main.hs Updated for Rust 1.0 release Jun 10, 2015

Rust-Haskell FFI Example

A lot of Haskell people I've talked to are excited about the prospect of using Rust as a replacement for C in certain speed-critical or low-level parts of their application. To that end, and in light of the recent (as of this writing) Rust 1.0 alpha release, I've shown here a small example of calling Rust from Haskell.

This contains a single Haskell file and two Rust libraries which Haskell can call out to. The first Rust library is contained in and implements a simple factorial, which is easier to wrap; the second is contained in and demonstrates allocating memory in Rust, passing it to Haskell, using wrapped Rust functions to manipulate it, and finally allowing Haskell's GC to call back into Rust to free it.

This of course requires GHC and a reasonably recent version of rustc installed. This version has been tested with GHC versions 7.8.4 and 7.10.1, and the following rustc versions:

1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)

All the examples here I release into the public domain.

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