struct HeadTail<I>where
    I: Iterator,{
    head: I::Item,
    tail: I,
}
Expand description

Head element and Tail iterator pair

PartialEq, Eq, PartialOrd and Ord are implemented by comparing sequences based on first items (which are guaranteed to exist).

The meanings of PartialOrd and Ord are reversed so as to turn the heap used in KMerge into a min-heap.

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§head: I::Item§tail: I

Implementations§

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impl<I> HeadTail<I>where I: Iterator,

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fn new(it: I) -> Option<Self>

Constructs a HeadTail from an Iterator. Returns None if the Iterator is empty.

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fn next(&mut self) -> Option<I::Item>

Get the next element and update head, returning the old head in Some.

Returns None when the tail is exhausted (only head then remains).

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fn size_hint(&self) -> (usize, Option<usize>)

Hints at the size of the sequence, same as the Iterator method.

Trait Implementations§

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impl<I> Clone for HeadTail<I>where I: Iterator + Clone, I::Item: Clone,

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<I> Debug for HeadTail<I>where I: Iterator + Debug, I::Item: Debug,

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<I> RefUnwindSafe for HeadTail<I>where I: RefUnwindSafe, <I as Iterator>::Item: RefUnwindSafe,

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impl<I> Send for HeadTail<I>where I: Send, <I as Iterator>::Item: Send,

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impl<I> Sync for HeadTail<I>where I: Sync, <I as Iterator>::Item: Sync,

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impl<I> Unpin for HeadTail<I>where I: Unpin, <I as Iterator>::Item: Unpin,

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impl<I> UnwindSafe for HeadTail<I>where I: UnwindSafe, <I as Iterator>::Item: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.