crate_interface

Provides a way to define an interface (trait) in a crate, but can implement or use it in any crate. It 's usually used to solve the problem of circular dependencies between crates.

Example

// Define the interface
#[crate_interface::def_interface]
pub trait HelloIf {
    fn hello(&self, name: &str, id: usize) -> String;
}

// Implement the interface in any crate
struct HelloIfImpl;

#[crate_interface::impl_interface]
impl HelloIf for HelloIfImpl {
    fn hello(&self, name: &str, id: usize) -> String {
        format!("Hello, {} {}!", name, id)
    }
}

// Call `HelloIfImpl::hello` in any crate
assert_eq!(
    HelloIf::hello("world", 123),
    "Hello, world 123!"
);
assert_eq!(
    HelloIf::hello("rust", 456), // another calling style
    "Hello, rust 456!"
);