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mod contains;

/// Extension trait providing additional methods for `Result`.
pub trait ResultExt<T, E> {
    /// Returns `true` if the result is an [`Ok`] value containing the given value.
    ///
    /// # Examples
    ///
    /// ```
    /// use result_ext::ResultExt;
    ///
    /// let x: Result<u32, &str> = Ok(2);
    /// assert_eq!(x.contains(&2), true);
    ///
    /// let x: Result<u32, &str> = Ok(3);
    /// assert_eq!(x.contains(&2), false);
    ///
    /// let x: Result<u32, &str> = Err("Some error message");
    /// assert_eq!(x.contains(&2), false);
    /// ```
    #[must_use]
    fn contains<U>(&self, x: &U) -> bool where U: PartialEq<T>;

    /// Returns `true` if the result is an [`Err`] value containing the given value.
    ///
    /// # Examples
    ///
    /// ```
    /// use result_ext::ResultExt;
    ///
    /// let x: Result<u32, &str> = Ok(2);
    /// assert_eq!(x.contains_err(&"Some error message"), false);
    ///
    /// let x: Result<u32, &str> = Err("Some error message");
    /// assert_eq!(x.contains_err(&"Some error message"), true);
    ///
    /// let x: Result<u32, &str> = Err("Some other error message");
    /// assert_eq!(x.contains_err(&"Some error message"), false);
    /// ```
    #[must_use]
    fn contains_err<F>(&self, f: &F) -> bool where F: PartialEq<E>;
}