Trait SymmetricFoldMap 

pub trait SymmetricFoldMap<K, V> {
    // Required methods
    fn symmetric_fold<R>(
        &self,
        other: &Self,
        init: R,
        f: impl FnMut(R, (&K, DiffElement<&V>)) -> R,
    ) -> R;
    fn len(&self) -> usize;
    fn nonincremental_fold<R>(
        &self,
        init: R,
        f: impl FnMut(R, (&K, &V)) -> R,
    ) -> R;

    // Provided method
    fn is_empty(&self) -> bool { ... }
}

Required Methods

fn symmetric_fold<R>( &self, other: &Self, init: R, f: impl FnMut(R, (&K, DiffElement<&V>)) -> R, ) -> R

fn len(&self) -> usize

fn nonincremental_fold<R>(&self, init: R, f: impl FnMut(R, (&K, &V)) -> R) -> R

Basically self.iter().fold(init, f).

Provided Methods

fn is_empty(&self) -> bool

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<K: Ord, V: PartialEq> SymmetricFoldMap<K, V> for BTreeMap<K, V>

fn symmetric_fold<R>( &self, other: &Self, init: R, f: impl FnMut(R, (&K, DiffElement<&V>)) -> R, ) -> R

fn len(&self) -> usize

fn nonincremental_fold<R>(&self, init: R, f: impl FnMut(R, (&K, &V)) -> R) -> R

impl<K: Ord, V: PartialEq> SymmetricFoldMap<K, V> for Rc<BTreeMap<K, V>>

fn symmetric_fold<R>( &self, other: &Self, init: R, f: impl FnMut(R, (&K, DiffElement<&V>)) -> R, ) -> R

fn len(&self) -> usize

fn nonincremental_fold<R>(&self, init: R, f: impl FnMut(R, (&K, &V)) -> R) -> R

Implementors