Struct `Keys`

struct Keys<'a, T> { ... }

An iterator over HeaderMap keys.

Each header name is yielded only once, even if it has more than one associated value.

Implementations

`impl<'a, T> ExactSizeIterator for Keys<'a, T>`

`impl<'a, T> Freeze for Keys<'a, T>`

`impl<'a, T> FusedIterator for Keys<'a, T>`

`impl<'a, T> Iterator for Keys<'a, T>`

fn next(self: &mut Self) -> Option<<Self as >::Item>
fn size_hint(self: &Self) -> (usize, Option<usize>)
fn nth(self: &mut Self, n: usize) -> Option<<Self as >::Item>
fn count(self: Self) -> usize
fn last(self: Self) -> Option<<Self as >::Item>

`impl<'a, T> RefUnwindSafe for Keys<'a, T>`

`impl<'a, T> Send for Keys<'a, T>`

`impl<'a, T> Sync for Keys<'a, T>`

`impl<'a, T> Unpin for Keys<'a, T>`

`impl<'a, T> UnsafeUnpin for Keys<'a, T>`

`impl<'a, T> UnwindSafe for Keys<'a, T>`

`impl<'a, T: $crate::fmt::Debug> Debug for Keys<'a, T>`

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

`impl<I> IntoIterator for Keys<'a, T>`

fn into_iter(self: Self) -> I

`impl<T> Any for Keys<'a, T>`

fn type_id(self: &Self) -> TypeId

`impl<T> Borrow for Keys<'a, T>`

fn borrow(self: &Self) -> &T

`impl<T> BorrowMut for Keys<'a, T>`

fn borrow_mut(self: &mut Self) -> &mut T

`impl<T> From for Keys<'a, T>`

fn from(t: T) -> T: Returns the argument unchanged.

`impl<T, U> Into for Keys<'a, T>`

fn into(self: Self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

`impl<T, U> TryFrom for Keys<'a, T>`

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

`impl<T, U> TryInto for Keys<'a, T>`

fn try_into(self: Self) -> Result<U, <U as TryFrom<T>>::Error>