Struct Lens 

pub struct Lens<Root, Value> {
    pub get: fn(&Root) -> &Value,
    pub set: fn(&mut Root, Value),
}

A Lens represents a getter + setter for a field in Root.

Fields

get: fn(&Root) -> &Value

set: fn(&mut Root, Value)

Implementations

impl<Root, Value> Lens<Root, Value>

pub fn new(get: fn(&Root) -> &Value, set: fn(&mut Root, Value)) -> Self

pub fn get_fn(&self) -> impl Fn(&Root) -> &Value

Getter: like Swift get(\.field)

pub fn over( &self, update: impl Fn(Value) -> Value + 'static + Clone, ) -> impl Fn(Root) -> Root

where Root: Clone, Value: Clone,

Immutable setter: like Swift prop(\.field)

pub fn set_value(&self, value: Value) -> impl Fn(Root) -> Root

where Root: Clone, Value: Clone + 'static,

Set a constant value: like Swift set(\.field, value)

pub fn mver( &self, update: impl Fn(&mut Value) + 'static + Clone, ) -> impl Fn(&mut Root)

where Root: Clone, Value: Clone,

Mutable in-place setter: like Swift mprop