CODEWITHSUNDEEP
modulerustrust-cargo
CoffeDeveloper
CoffeDeveloper

Reputation: 8315

How to include objects into mod.rs in rust?

Since the documentation on that is a bit vast, I wanted just to tackle a single problem with modules

I have the following files

project/src/main.rs
project/src/win/mod.rs  //just some win32 specific utilities
project/src/geom/mod.rs
project/src/geom/rectangle.rs
project/src/geom/triangle.rs

As long as there is just the mod.rs (like with the folder win), I have no problems

But that was a small file, so no real problems, then I'm starting to add much code inside geom, I can't add that all inside mod.rs

How can I add all shapes to geom module?

mod geom;

fn main()
{
   let tri  = geom::triangle::new();
   let rect = geom::rectangle:new();
}

Is it also possible to keep a mod.rs inside the geom folder in order to use that to expose all shapes?

Upvotes: 1

Views: 2377

Answers (1)

bergercookie
bergercookie

Reputation: 2760

if it's a library you are looking to create (and not an executable crate) there must be at least a src/lib.rs file. That file most times has no main() and it's usual to "import" the various sub-modules in there.

In your case, you could bring in scope other modules with something like this:

// For example in project/src/geom/mod.rs
// bring rectangle and triangle in the scope of the current module:

pub mod rectangle;
pub mod triangle;

After this whatever other file uses geom/mod.rs also has access to functions / structs defined in rectangle.rs and can access them using something like rectangle::<struct-or-function-name

Additionally, you can also use something like pub use self::rectangle::*:

pub mod rectangle;
pub mod triangle;

use self::rectangle::*;
use self::triangle::*;

This brings all the functions / structs etc. in the scope of geom/mod.rs. This way whatever other module uses geom/mod.rs won't have to specify e.g., the extra rectangle:: scope before accessing its structs and functions.

Upvotes: 3

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