Struct mini_rx::Var

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pub struct Var<'c, T>(_);

Expand description

Index into the RxDAG which will give you a variable.

To actually get or set the value you need a shared reference to the RxDAG.

Implementations

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impl<'c, T> Var<'c, T>

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pub fn get<'a>(self, c: impl RxContext<'a, 'c>) -> &'a T where
'c: 'a,

Read the variable

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pub fn set<'a>(self, c: impl MutRxContext<'a, 'c>, value: T) where
'c: 'a,

Write a new value to the variable. The changes will be applied on recompute.

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pub fn modify<'a, F: FnOnce(&T) -> T>(
 self,
 c: impl MutRxContext<'a, 'c>,
 modify: F
) where
 'c: 'a,

Apply a transformation to the latest value. If Var::set this will apply to the recently-set value. This must be used instead of chaining Var::set and Var::get, since setting a value doesn’t make it returned by Var::get until the graph is recomputed.

Like set the changes only actually reflect in Var::get on recompute.

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pub fn derive<U, GetFn: Fn(&T) -> &U, SetFn: Fn(&T, U) -> T>(
 self,
 get: GetFn,
 set: SetFn
) -> DVar<'c, T, U, GetFn, SetFn>

Create a view of part of the variable.

Do know that SetFn will take the most recently-set value even if the graph hasn’t been recomputed. This means you can create multiple derives and set them all before recompute, and you don’t have to worry about the later derived values setting their part on the stale whole.

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pub fn derive_using_clone<U, GetFn: Fn(&T) -> &U, SetFn: Fn(&mut T, U)>(
 self,
 get: GetFn,
 set: SetFn
) -> DVar<'c, T, U, GetFn, CloneSetFn<T, U, SetFn>> where
 T: Clone,

Create a view of part of the variable, which clones the value on set.

Do know that SetFn will take the most recently-set value even if the graph hasn’t been recomputed. This means you can create multiple derives and set them all before recompute, and you don’t have to worry about the later derived values setting their part on the stale whole.