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Prerequisites

This tutorial builds on our arithmetic and (creatively-named) arithmetic-procmacro examples, which will be useful when we've omitted things.

Here we will be creating a math library - so we assume a cargo new --lib math environment.

Add uniffi as a dependency and build-dependency

In your crate's Cargo.toml add:

[dependencies]
uniffi = { version = "[latest-version]", features = [ "cli" ] }

[build-dependencies]
uniffi = { version = "[latest-version]", features = [ "build" ] }

UniFFI has not reached version 1.0 yet. Versions are typically specified as 0.[minor-version].

Build your crate as a cdylib

Ensure your crate builds as a cdylib so looks something like 

[lib]
crate-type = ["cdylib"]
name = "math" # This is our crate name in this tutorial
to your crate's Cargo.toml.

Note: You also need to add staticlib crate type if you target iOS.