mod

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Introduction

mod is a Rust project that provides two simple and useful utility functions for converting between Option and Result types. The project includes two main functions:

1. option_to_result<T, E>: Converts an Option<T> to a Result<T, E>.
2. result_to_option<T, E>: Converts a Result<T, E> to an Option<T>.

Installation

You can add this project to your Rust project by running the following command:

cargo add mod

Usage

First, ensure that you include the mod crate in your project:

use r#mod::{option_to_result, result_to_option};

Function Descriptions

option_to_result

Converts an Option<T> to a Result<T, E>. If the Option is Some, it returns the value wrapped in Ok; if it is None, it returns the specified error.

pub fn option_to_result<T, E>(option: Option<T>, err: E) -> Result<T, E>
where
    E: Clone,
{
    match option {
        Some(value) => Ok(value),
        None => Err(err),
    }
}

Example:

let some_value = Some(42);
let none_value: Option<i32> = None;
let error = "Error";

assert_eq!(option_to_result(some_value, error.to_string()), Ok(42));
assert_eq!(option_to_result(none_value, error.to_string()), Err("Error".to_string()));

result_to_option

Converts a Result<T, E> to an Option<T>. If the Result is Ok, it returns the value wrapped in Some; if it is Err, it returns None.

pub fn result_to_option<T, E>(result: Result<T, E>) -> Option<T>
where
    E: Clone,
{
    match result {
        Ok(value) => Some(value),
        Err(_) => None,
    }
}

Example:

let ok_result = Ok::<i32, &str>(42);
let err_result = Err::<i32, &str>("Error");

assert_eq!(result_to_option(ok_result), Some(42));
assert_eq!(result_to_option(err_result), None);

Testing

This project includes some unit tests to verify the correctness of the functionality. You can run the tests by executing the following command:

cargo test

The test cases are located in the tests module and cover the option_to_result and result_to_option functions:

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_option_to_result() {
        let some_value = Some(42);
        let none_value: Option<i32> = None;
        let error = "Error";

        assert_eq!(option_to_result(some_value, error.to_string()), Ok(42));
        assert_eq!(option_to_result(none_value, error.to_string()), Err("Error".to_string()));
    }

    #[test]
    fn test_result_to_option() {
        let ok_result = Ok::<i32, &str>(42);
        let err_result = Err::<i32, &str>("Error");

        assert_eq!(result_to_option(ok_result), Some(42));
        assert_eq!(result_to_option(err_result), None);
    }
}

License

This project is licensed under the GPL license. See the LICENSE file for details.

Contribution

Contributions are welcome! Please submit issues or pull requests.

Thank you for using mod! If you have any questions or suggestions, feel free to contact us.