Trait WhenBuilder 

pub trait WhenBuilder: Sized {
    // Required method
    fn otherwise<P: Piece>(self, build_arm: impl Fn() -> P + 'static) -> Self;
}

Builder methods of When, reachable through a Decorated (docs/api-style.md “Typed builders and erasure”): generic modifiers and typed ones chain in any order.

Required Methods

fn otherwise<P: Piece>(self, build_arm: impl Fn() -> P + 'static) -> Self

The arm built while the condition is false. Without it, false means “no subtree”.

The two arms need not return the same Piece type; each is erased to AnyPiece here. Exactly one arm is mounted at a time, in its own child scope, so flipping disposes the outgoing arm’s signals, bindings, and handlers before the incoming arm builds (§4.3).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl WhenBuilder for When

impl<DecoratedInner: WhenBuilder + Piece> WhenBuilder for Decorated<DecoratedInner>