[−][src]Struct tower_grpc::metadata::OccupiedEntry
A view into a single occupied location in a MetadataMap
.
This struct is returned as part of the Entry
enum.
Methods
impl<'a, VE: ValueEncoding> OccupiedEntry<'a, VE>
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pub fn key(&self) -> &MetadataKey<VE>
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Returns a reference to the entry's key.
Examples
let mut map = MetadataMap::new(); map.insert("host", "world".parse().unwrap()); if let Entry::Occupied(e) = map.entry("host").unwrap() { assert_eq!("host", e.key()); }
pub fn get(&self) -> &MetadataValue<VE>
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Get a reference to the first value in the entry.
Values are stored in insertion order.
Panics
get
panics if there are no values associated with the entry.
Examples
let mut map = MetadataMap::new(); map.insert("host", "hello.world".parse().unwrap()); if let Entry::Occupied(mut e) = map.entry("host").unwrap() { assert_eq!(e.get(), &"hello.world"); e.append("hello.earth".parse().unwrap()); assert_eq!(e.get(), &"hello.world"); }
pub fn get_mut(&mut self) -> &mut MetadataValue<VE>
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Get a mutable reference to the first value in the entry.
Values are stored in insertion order.
Panics
get_mut
panics if there are no values associated with the entry.
Examples
let mut map = MetadataMap::default(); map.insert("host", "hello.world".parse().unwrap()); if let Entry::Occupied(mut e) = map.entry("host").unwrap() { e.get_mut().set_sensitive(true); assert_eq!(e.get(), &"hello.world"); assert!(e.get().is_sensitive()); }
pub fn into_mut(self) -> &'a mut MetadataValue<VE>
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Converts the OccupiedEntry
into a mutable reference to the first
value.
The lifetime of the returned reference is bound to the original map.
Panics
into_mut
panics if there are no values associated with the entry.
Examples
let mut map = MetadataMap::default(); map.insert("host", "hello.world".parse().unwrap()); map.append("host", "hello.earth".parse().unwrap()); if let Entry::Occupied(e) = map.entry("host").unwrap() { e.into_mut().set_sensitive(true); } assert!(map.get("host").unwrap().is_sensitive());
pub fn insert(&mut self, value: MetadataValue<VE>) -> MetadataValue<VE>
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Sets the value of the entry.
All previous values associated with the entry are removed and the first
one is returned. See insert_mult
for an API that returns all values.
Examples
let mut map = MetadataMap::new(); map.insert("host", "hello.world".parse().unwrap()); if let Entry::Occupied(mut e) = map.entry("host").unwrap() { let mut prev = e.insert("earth".parse().unwrap()); assert_eq!("hello.world", prev); } assert_eq!("earth", map.get("host").unwrap());
ⓘImportant traits for ValueDrain<'a, VE>pub fn insert_mult(&mut self, value: MetadataValue<VE>) -> ValueDrain<VE>
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Sets the value of the entry.
This function does the same as insert
except it returns an iterator
that yields all values previously associated with the key.
Examples
let mut map = MetadataMap::new(); map.insert("host", "world".parse().unwrap()); map.append("host", "world2".parse().unwrap()); if let Entry::Occupied(mut e) = map.entry("host").unwrap() { let mut prev = e.insert_mult("earth".parse().unwrap()); assert_eq!("world", prev.next().unwrap()); assert_eq!("world2", prev.next().unwrap()); assert!(prev.next().is_none()); } assert_eq!("earth", map.get("host").unwrap());
pub fn append(&mut self, value: MetadataValue<VE>)
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Insert the value into the entry.
The new value is appended to the end of the entry's value list. All previous values associated with the entry are retained.
Examples
let mut map = MetadataMap::new(); map.insert("host", "world".parse().unwrap()); if let Entry::Occupied(mut e) = map.entry("host").unwrap() { e.append("earth".parse().unwrap()); } let values = map.get_all("host"); let mut i = values.iter(); assert_eq!("world", *i.next().unwrap()); assert_eq!("earth", *i.next().unwrap());
pub fn remove(self) -> MetadataValue<VE>
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Remove the entry from the map.
All values associated with the entry are removed and the first one is
returned. See remove_entry_mult
for an API that returns all values.
Examples
let mut map = MetadataMap::new(); map.insert("host", "world".parse().unwrap()); if let Entry::Occupied(e) = map.entry("host").unwrap() { let mut prev = e.remove(); assert_eq!("world", prev); } assert!(!map.contains_key("host"));
pub fn remove_entry(self) -> (MetadataKey<VE>, MetadataValue<VE>)
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Remove the entry from the map.
The key and all values associated with the entry are removed and the
first one is returned. See remove_entry_mult
for an API that returns
all values.
Examples
let mut map = MetadataMap::new(); map.insert("host", "world".parse().unwrap()); if let Entry::Occupied(e) = map.entry("host").unwrap() { let (key, mut prev) = e.remove_entry(); assert_eq!("host", key.as_str()); assert_eq!("world", prev); } assert!(!map.contains_key("host"));
pub fn remove_entry_mult(self) -> (MetadataKey<VE>, ValueDrain<'a, VE>)
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Remove the entry from the map.
The key and all values associated with the entry are removed and returned.
ⓘImportant traits for ValueIter<'a, VE>pub fn iter(&self) -> ValueIter<VE>
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Returns an iterator visiting all values associated with the entry.
Values are iterated in insertion order.
Examples
let mut map = MetadataMap::new(); map.insert("host", "world".parse().unwrap()); map.append("host", "earth".parse().unwrap()); if let Entry::Occupied(e) = map.entry("host").unwrap() { let mut iter = e.iter(); assert_eq!(&"world", iter.next().unwrap()); assert_eq!(&"earth", iter.next().unwrap()); assert!(iter.next().is_none()); }
pub fn iter_mut(&mut self) -> ValueIterMut<VE>
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Returns an iterator mutably visiting all values associated with the entry.
Values are iterated in insertion order.
Examples
let mut map = MetadataMap::default(); map.insert("host", "world".parse().unwrap()); map.append("host", "earth".parse().unwrap()); if let Entry::Occupied(mut e) = map.entry("host").unwrap() { for e in e.iter_mut() { e.set_sensitive(true); } } let mut values = map.get_all("host"); let mut i = values.iter(); assert!(i.next().unwrap().is_sensitive()); assert!(i.next().unwrap().is_sensitive());
Trait Implementations
impl<'a, VE: ValueEncoding> IntoIterator for OccupiedEntry<'a, VE> where
VE: 'a,
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VE: 'a,
type Item = &'a mut MetadataValue<VE>
The type of the elements being iterated over.
type IntoIter = ValueIterMut<'a, VE>
Which kind of iterator are we turning this into?
fn into_iter(self) -> ValueIterMut<'a, VE>
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impl<'a, 'b: 'a, VE: ValueEncoding> IntoIterator for &'b OccupiedEntry<'a, VE>
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type Item = &'a MetadataValue<VE>
The type of the elements being iterated over.
type IntoIter = ValueIter<'a, VE>
Which kind of iterator are we turning this into?
ⓘImportant traits for ValueIter<'a, VE>fn into_iter(self) -> ValueIter<'a, VE>
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impl<'a, 'b: 'a, VE: ValueEncoding> IntoIterator for &'b mut OccupiedEntry<'a, VE>
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type Item = &'a mut MetadataValue<VE>
The type of the elements being iterated over.
type IntoIter = ValueIterMut<'a, VE>
Which kind of iterator are we turning this into?
fn into_iter(self) -> ValueIterMut<'a, VE>
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impl<'a, VE: Debug + ValueEncoding> Debug for OccupiedEntry<'a, VE>
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Auto Trait Implementations
impl<'a, VE> Unpin for OccupiedEntry<'a, VE> where
VE: Unpin,
VE: Unpin,
impl<'a, VE> Sync for OccupiedEntry<'a, VE> where
VE: Sync,
VE: Sync,
impl<'a, VE> Send for OccupiedEntry<'a, VE> where
VE: Send,
VE: Send,
impl<'a, VE> !UnwindSafe for OccupiedEntry<'a, VE>
impl<'a, VE> RefUnwindSafe for OccupiedEntry<'a, VE> where
VE: RefUnwindSafe,
VE: RefUnwindSafe,
Blanket Implementations
impl<T> From<T> for T
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impl<I> IntoIterator for I where
I: Iterator,
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I: Iterator,
type Item = <I as Iterator>::Item
The type of the elements being iterated over.
type IntoIter = I
Which kind of iterator are we turning this into?
fn into_iter(self) -> I
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,