[−][src]Trait photonix::focus::composites::ModifySecond

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

A variant of Modify, reaching two 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 }

 pub struct Address(String);

 //            Level 1    Level 2     Parent type
 //                |        |           |
 impl ModifySecond<Company, String> for Employee {}
 impl GetSecond<Company, String> for Employee {}

 let john_doe = Employee {
     name: String::from("John Doe"),
     company: Company {
         name: String::from("Acme Corporation"),
         address: Address(String::from("4 Foo Road, Bar City")),
         }
     };

 let john_doe_new = john_doe.modify_second(|name| name.replace("Corporation", "Inc"));

 assert_eq!("Acme Inc", john_doe_new.get_second().as_str());

Provided methods

fn modify_second(self, f: impl FnOnce(LevelTwo) -> LevelTwo) -> Self

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Implementations on Foreign Types

impl<LevelOne, LevelTwo> ModifySecond<LevelOne, LevelTwo> for Option<LevelOne> where
    LevelOne: Modify<LevelTwo>, [src]

fn modify_second(self, f: impl FnOnce(LevelTwo) -> LevelTwo) -> Self[src]

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Implementors

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