Trait photonix::focus::composites::ModifyFourth

pub trait ModifyFourth<LevelOne, LevelTwo, LevelThree, LevelFour> where
    LevelThree: Modify<LevelFour>,
    LevelTwo: Modify<LevelThree>,
    LevelOne: Modify<LevelTwo>,
    Self: Modify<LevelOne> + Sized, {
    fn modify_fourth(self, f: impl FnOnce(LevelFour) -> LevelFour) -> Self { ... }
}

A variant of Modify, reaching four levels deep in the data structure.

Examples

  #[derive(Get, Modify)]
  pub struct Employee { pub name: String, pub company: Company }

  #[derive(Get, Modify)]
  pub struct Company { pub name: String, pub address: Address }

  #[derive(Get, Modify)]
  pub struct Address { pub city: String, pub street: Street }

  #[derive(Get, Modify)]
  pub struct Street { pub number: u16, pub name: String }

 let john_doe = Employee {
     name: String::from("John Doe"),
     company: Company {
         name: String::from("Acme Corporation"),
         address: Address {
                 city: String::from("London"),
                 street: Street {
                     number: 23,
                     name: String::from("High street"),
                 }
             },
         }
     };

 //              Level 1   Level 2   Level 3 Level 4     Parent type
 //                 |         |        |       |           |
 impl ModifyFourth<Company, Address, Street, String> for Employee {}
 impl GetFourth<Company, Address, Street, String> for Employee {}

 let john_at_new_street =
     john_doe.modify_fourth(|street_name| street_name.replace("street", "road"));

 assert_eq!("High road", john_at_new_street.get_fourth().as_str());

Provided methods

fn modify_fourth(self, f: impl FnOnce(LevelFour) -> LevelFour) -> Self

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Implementations on Foreign Types

impl<LevelOne, LevelTwo, LevelThree, LevelFour> ModifyFourth<LevelOne, LevelTwo, LevelThree, LevelFour> for Option<LevelOne> where
    LevelOne: Modify<LevelTwo>,
    LevelTwo: Modify<LevelThree>,
    LevelThree: Modify<LevelFour>, 

fn modify_fourth(self, f: impl FnOnce(LevelFour) -> LevelFour) -> Self

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Implementors

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