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pub(crate) mod book;
pub mod book_sys;
pub(crate) mod date;
pub mod genres;
pub(crate) mod the_book;

/// Error-handling type.
/// If everything is ok, it should return ref on self (but it's not necessary),
/// else it will return err with code
/// (that's will help you to correctly understand error)

pub(crate) type ResultSelf<'a, T> = std::result::Result<&'a mut T, u8>;

/// **DEPRECATED**
///
/// Used when Book was containing title, author and pages as clones, but not references.
/// No need for using now since it all uses in TheBook
///
/// Trait, which used to params of books
/// like title, author and amount of pages

#[deprecated(
    note = "Used when Book was containing title, author and pages as clones,\
     but not references. No need for using now since it all uses in TheBook"
)]
pub(crate) trait BookInterface {
    /// Changes title of the book
    fn change_title(&mut self, new_title: String) -> &mut Self;

    /// Changes author of the book
    fn change_author(&mut self, new_author: String) -> &mut Self;

    /// Changes amount of pages of the book
    fn change_pages(&mut self, new_pages: u16) -> &mut Self;
}