rustlayoutmodule

How to add a common module to examples in Rust?

I have 2 binaries in examples folder: example1_main.rs, example2_main.rs. How do I add a common module example_common.rs that could be used by all example programs? and how to import them?

The files layout is like this:

src: ...
examples
|- example1_main.rs
|- example2_main.rs
|- example_common1.rs (how to add common modules and import them in *_main.rs?)
|- example_common2.rs
Solution

  • You can use the include! macro, which copies the source code, instead of a normal use statement:

    // examples/example_main.rs

include!("./common.rs");

pub fn main() {
    println!("{}", library::add(common::double(2), 2)); // 6
}

    // examples/common.rs

mod common {
    pub fn double(x: u64) -> u64 {
        x * 2
    }
}

    // src/lib.rs

pub fn add(left: u64, right: u64) -> u64 {
    left + right
}