Enum texcraft_stdext::collections::groupingmap::Item

pub enum Item<T> {
    BeginGroup,
    Value(T),
}

The item for the IterAll iterator.

Variants

BeginGroup

Begin a new group.

Value(T)

Insert the T=(key, value) tuple into the container.

Implementations

impl<T> Item<T>

pub fn adapt_map<B, F: FnMut(T) -> B>(f: F) -> impl FnMut(Item<T>) -> Item<B>

Adapt a lambda to use in Iterator::map for iterators over this item.

When iterating over items of this type, one almost always wants to keep Item::BeginGroup constant and apply a transformation to the Item::Value variant. This adaptor function helps with this by converting a lambda that operates on T to a lambda that operates on Item<T>.

let start: Vec<Item<usize>> = vec![
    Item::Value(1),
    Item::BeginGroup,
    Item::Value(2),
];
let end: Vec<Item<usize>> = start.into_iter().map(Item::adapt_map(|i| { i *100 })).collect();
assert_eq![end, vec![
    Item::Value(100),
    Item::BeginGroup,
    Item::Value(200),
]];

Trait Implementations

impl<T: Debug> Debug for Item<T>

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

Formats the value using the given formatter.

impl<K: Eq + Hash + Clone, V, T: BackingContainer<K, V>> FromIterator<Item<(K, V)>> for GroupingContainer<K, V, T>

fn from_iter<I: IntoIterator<Item = Item<(K, V)>>>(iter: I) -> Self

Creates a value from an iterator.

impl<T: PartialEq> PartialEq<Item<T>> for Item<T>

fn eq(&self, other: &Item<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Eq> Eq for Item<T>

impl<T> StructuralEq for Item<T>

impl<T> StructuralPartialEq for Item<T>