// lib code
mod my_generated_crate {
    use std::marker::PhantomData;

    pub struct UserDefinedFunctions<FV, FN> {
        pub version_func: FV,
        pub name_func: FN,
    }

    pub struct MyApi<FV, FN> {
        user_defined_functions: UserDefinedFunctions<FV, FN>,
    }

    impl<FV: Fn() -> i32, FN: Fn() -> &'static str> MyApi<FV, FN> {
        pub fn new(user_defined_functions: UserDefinedFunctions<FV, FN>) -> Self {
            Self {
                user_defined_functions,
            }
        }

        pub fn get_name_and_double_version(&self) -> (i32, &'static str) {
            (
                (self.user_defined_functions.version_func)() * 2,
                (self.user_defined_functions.name_func)(),
            )
        }
    }
}

// user code
use crate::my_generated_crate::{MyApi, UserDefinedFunctions};

fn version_func() -> i32 {
    10
}

fn name_func() -> &'static str {
    "Hello lib!"
}

fn main() {
    let api = MyApi::new(UserDefinedFunctions {
        version_func,
        name_func,
    });
    println!("{:?}", api.get_name_and_double_version());

    let context = 100;
    let api_with_context = MyApi::new(UserDefinedFunctions {
        version_func: || context,
        name_func,
    });
    println!("{:?}", api_with_context.get_name_and_double_version());
}