Rust 参考模组

Question

I have a set of files in a workspace which I want to reference from another directory, but I cannot find the syntax I need to use.

The example is:

Primary
|_______ First
|            |_____ src
|                    |______ Cool_thing.rs
|_______ Second
            |_____ src
                    |______ main.rs

I want to reference a struct in Cool_things from main.rs

In Primary's Cargo.toml I put:

[workspace]
members= ["First","Second", "Third"]

[dependencies.Second]
First= { path = "First" }

In the Cargo.toml in the Second directory I have

[dependencies]
First = { path = "../First" }

I have been trying things in my main.rs like:

extern crate First;
use First::Cool_things::Cool_things;

No variation of use or mod seems to allow me to reference the struct or impl or functions in mod Cool_things .

Answer 1

The problem was it needed a "lib.rs" in the First src directory. Basically, the documentation for rust seems to be a bit remiss in telling people if you want to use local-dependancies then you have to have a lib.rs file which lists all the mods you are planning to access. So the creation of a lib.rs in the First src directory, and listing "Mod Cool_things" would allow the other package to reference the mod files in that directory.

The cargo.toml files: Inserted in the question above had the correct paths and dependancies, the issue was all around the lack of a lib.rs file.

So if you are planning a multiple binary program, you'll need to remember to have a lib.rs file whenever you're breaking up your code and then accessing modules from other parts of the workspace.