Struct FallbackChain 

pub struct FallbackChain<N> { /* private fields */ }

Tries each strategy in order until one returns a result.

Unlike WithFallback (which is generic and zero-cost), FallbackChain uses trait objects — suitable when the strategy list is built at runtime.

Implementations

impl<N> FallbackChain<N>

pub fn new(strategies: Vec<Box<dyn Strategy<N> + Send + Sync>>) -> Self

Trait Implementations

impl<N> Debug for FallbackChain<N>

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

Formats the value using the given formatter.

impl<N> Strategy<N> for FallbackChain<N>

fn select(&self, candidates: &[N], ctx: &SelectionContext) -> Option<usize>

Pick the next node. Returns None when candidates is empty or all candidates are excluded via SelectionContext::exclude.