Struct spirit_tokio::either::EitherDriver

pub struct EitherDriver<A, B> where
    A: Fragment,
    B: Fragment,  { /* fields omitted */ }

A Driver used for Either Fragments.

This switches between driving the variants ‒ if the fragment changes from one variant to another, the old driver is dropped and new one created for the other one. If the variant stays the same, driving is delegated to the existing driver.

Note that there are limitations to what this driver implementation ‒ see the Either drawbacks.

Trait Implementations

impl<A: Debug, B: Debug> Debug for EitherDriver<A, B> where
    A: Fragment,
    B: Fragment,
    A::Driver: Debug,
    B::Driver: Debug,
    A::Driver: Debug,
    B::Driver: Debug, 

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<A, B> Default for EitherDriver<A, B> where
    A: Fragment,
    A::Driver: Default,
    B: Fragment, 

fn default() -> Self

Returns the "default value" for a type.

impl<A, B> Driver<Either<A, B>> for EitherDriver<A, B> where
    A: Fragment,
    A::Driver: Driver<A, SubFragment = A> + Default,
    B: Fragment,
    B::Driver: Driver<B, SubFragment = B> + Default, 

type SubFragment = Either<A, B>

The smaller Fragment the driver cuts F into.

fn instructions<T, I>(
    &mut self,
    fragment: &Either<A, B>,
    transform: &mut T,
    name: &'static str
) -> Result<Vec<Instruction<T::OutputResource>>, Vec<AnyError>> where
    T: Transformation<<Self::SubFragment as Fragment>::Resource, I, Self::SubFragment>, 

Issues the instructions how to transition to the new fragment.

fn confirm(&mut self, name: &'static str)

Call to this method informs the Driver that the instructions returned by the last call to instructions were followed and the changes have taken place.

fn abort(&mut self, name: &'static str)

Call to this method informs the Driver that the instructions returned by the last call to instructions were not followed and were dropped.

fn maybe_cached(&self, fragment: &Either<A, B>, name: &'static str) -> bool

Informs if there's a chance the new fragment will use something in the Driver's cache if applied.