Trait prql_compiler::IntoOnly

pub trait IntoOnly {
    type Item;

    fn into_only(self) -> Result<Self::Item>;
}

Returns the only element of an Iterator, or an error if it has more than one element.

Required Associated Types

type Item

Required Methods

fn into_only(self) -> Result<Self::Item>

Implementors

impl IntoOnly for ErrorMessages

type Item = ErrorMessage

impl<T, I> IntoOnly for Iwhere
    I: IntoIterator<Item = T>,

type Item = T