Trait polars_core::utils::CustomIterTools

source · [−]
pub trait CustomIterTools: Iterator {
    fn fold_first_<F>(self, f: F) -> Option<Self::Item>
    where
        F: FnMut(Self::Item, Self::Item) -> Self::Item,
    { ... }
    unsafe fn trust_my_length(
        self, 
        length: usize
    ) -> TrustMyLength<Self, Self::Item>ⓘNotable traits for TrustMyLength<I, J>impl<I, J> Iterator for TrustMyLength<I, J> where
    I: Iterator<Item = J>,     type Item = J; { ... }
    fn collect_trusted<T>(self) -> T
    where
        T: FromTrustedLenIterator<Self::Item>,
        Self: TrustedLen,
    { ... }
    fn collect_reversed<T>(self) -> T
    where
        T: FromIteratorReversed<Self::Item>,
        Self: TrustedLen,
    { ... }
    fn all_equal(&mut self) -> bool
    where
        Self::Item: PartialEq<Self::Item>,
    { ... }
    fn fold_options<A, B, F>(&mut self, start: B, f: F) -> Option<B>
    where
        Self: Iterator<Item = Option<A>>,
        F: FnMut(B, A) -> B,
    { ... }
}

Provided Methods

source

fn fold_first_<F>(self, f: F) -> Option<Self::Item> where
    F: FnMut(Self::Item, Self::Item) -> Self::Item, 

Turn any iterator in a trusted length iterator

Safety

The given length must be correct.

Implementors