Struct texcraft_stdext::collections::groupingmap::IterAll
source · pub struct IterAll<'a, K, V, T: BackingContainer<K, V> + 'a> { /* private fields */ }
Expand description
An iterator over all values in a grouping container, including invisible values.
To understand this iterator, it’s easiest to look at an example. Suppose we have the following grouping map:
let mut cat_colors = GroupingHashMap::default();
cat_colors.insert("paganini", "black", Scope::Local);
cat_colors.begin_group();
cat_colors.insert("paganini", "gray", Scope::Local);
After these mutations, the grouping map contains two tuples:
the tuple ("paganini", "gray")
that is visible, and
the tuple ("paganini", "black")
that is currently invisible.
The second tuple will become visible again when the group ends.
This iterator enables iterating over all tuples, visible and invisible. In this example here this is the result:
let items: Vec<_> = cat_colors.iter_all().collect();
assert_eq![items, vec![
Item::Value(("paganini", &"black")),
Item::BeginGroup,
Item::Value(("paganini", &"gray")),
]]
A good mental model for this iterator is that it replays all mutations (inserts and begin groups) that have been applied to the map. However it doesn’t replay the mutations exactly as they happened. Instead, it returns the minimal number of mutations to recreate the map. Thus:
let mut cat_colors = GroupingHashMap::default();
cat_colors.insert("local", "value_1", Scope::Local);
cat_colors.insert("local", "value_2", Scope::Local);
cat_colors.begin_group();
cat_colors.insert("local", "value_3", Scope::Local);
cat_colors.insert("local", "value_4", Scope::Local);
let items: Vec<_> = cat_colors.iter_all().collect();
assert_eq![items, vec![
Item::Value(("local", &"value_2")),
Item::BeginGroup,
Item::Value(("local", &"value_4")),
]]
It also converts global assignments within a group to regular assignments in the global scope:
let mut cat_colors = GroupingHashMap::default();
cat_colors.insert("global", "value_1", Scope::Local);
cat_colors.begin_group();
cat_colors.insert("global", "value_2", Scope::Global);
let items: Vec<_> = cat_colors.iter_all().collect();
assert_eq![items, vec![
Item::Value(("global", &"value_2")),
Item::BeginGroup,
]]
Trait Implementations§
source§impl<'a, K: Eq + Hash, V, T: BackingContainer<K, V> + 'a> Iterator for IterAll<'a, K, V, T>
impl<'a, K: Eq + Hash, V, T: BackingContainer<K, V> + 'a> Iterator for IterAll<'a, K, V, T>
source§fn next(&mut self) -> Option<Self::Item>
fn next(&mut self) -> Option<Self::Item>
source§fn next_chunk<const N: usize>(
&mut self
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fn size_hint(&self) -> (usize, Option<usize>)
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Self: Sized,
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fn nth(&mut self, n: usize) -> Option<Self::Item>
n
th element of the iterator. Read more1.28.0 · source§fn step_by(self, step: usize) -> StepBy<Self>where
Self: Sized,
fn step_by(self, step: usize) -> StepBy<Self>where Self: Sized,
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fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter>where Self: Sized, U: IntoIterator,
source§fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>where
Self: Sized,
G: FnMut() -> Self::Item,
fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>where Self: Sized, G: FnMut() -> Self::Item,
iter_intersperse
)separator
between adjacent items of the original iterator. Read more1.0.0 · source§fn map<B, F>(self, f: F) -> Map<Self, F>where
Self: Sized,
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F: FnMut(&mut St, Self::Item) -> Option<B>,
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F: FnMut(Self::Item) -> U,
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)true
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<R as Try>::Residual: Residual<Option<Self::Item>>,
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)N
elements of the iterator at a time. Read more1.11.0 · source§fn sum<S>(self) -> Swhere
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)Iterator
with those
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Self: Sized,
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with those of another. The comparison works like short-circuit
evaluation, returning a result without comparing the remaining elements.
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fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where Self: Sized, I: IntoIterator, F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Option<Ordering>,
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