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use dynamic_loading_contract::{PluginTrait};

/// In order to create a dynamic library that can be used in runtime discovery we need to use

/// crate-type = ["cdylib"] in our [Cargo.toml] file. Then it will create a .[dylib] extension file

pub struct PluginImplementation;

///Implementation of the contract [X] defined as an external dependency, we share with [dynamic_loading] cargo.

impl PluginTrait for PluginImplementation {

fn hello_world(&self) {

println!("Plugin Hello world implementation");

}

///For this patter, we use "dynamic objects", which typically refers to objects whose types

/// are not known at compile time and can vary at runtime.

/// The [Box] it will expose all functions defined in the [Trait].

/// Use [pub extern "C"] is mandatory to create a reference that can be used by consumer of this library,

/// to discover the function in runtime loading.

#[no_mangle]

pub extern "C" fn create_plugin() -> Box<dyn PluginTrait> {

Box::new(PluginImplementation { })

}