To use rustler_precompiled in an Elixir project, you need to follow these steps:

Add rustler_precompiled as a dependency in your mix.exs file. Update the deps function as follows:
elixir
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defp deps do
[
{:rustler_precompiled, "~> 0.22"}
]
end
In your Elixir code, define a Rust module and declare the NIF functions using rustler_precompiled. Here's an example:
elixir
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defmodule MyRustModule do
use Rustler.Precompiled

Define the NIF functions

defnif add(a, b), do: :rustler_precompiled.add(a, b)
defnif subtract(a, b), do: :rustler_precompiled.subtract(a, b)
end
In this example, we define two NIF functions, add and subtract, which are wrappers around the Rust NIF functions implemented in Rust.

In your mix.exs file, add the configuration for rustler_precompiled in the project function:
elixir
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def project do
[
...
compilers: Mix.compilers() ++ [:rustler_precompiled],
rustler_precompiled: [crate_path: "path/to/your/rust/project"],
...
]
end
Replace "path/to/your/rust/project" with the actual path to your Rust project. This configuration tells rustler_precompiled where to find your Rust project and compile it into a NIF.

Build your Elixir project by running mix compile. This will compile both your Elixir code and the Rust code.

Load and use the Rust NIF functions in your Elixir code. Here's an example usage:

elixir
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a = 5
b = 3

result = MyRustModule.add(a, b)
IO.puts("Result of adding #{a} and #{b} is: #{result}")

result = MyRustModule.subtract(a, b)
IO.puts("Result of subtracting #{b} from #{a} is: #{result}")
In this example, we call the add and subtract functions from the MyRustModule module, which internally invokes the Rust NIF functions implemented using rustler_precompiled.

Run your Elixir code using mix run or start your application using mix run --no-halt or iex -S mix.
By following these steps, you can integrate rustler_precompiled and use Rust NIFs in your Elixir project. Make sure to have Rust installed on your system and properly configure the Rust project and module names in the Elixir code. For more information and advanced usage, refer to the rustler_precompiled documentation and examples.