# [−][src]Trait rayon::iter::plumbing::UnindexedProducer

    pub trait UnindexedProducer: Send + Sized {
        type Item;
        fn split(self) -> (Self, Option<Self>);
        fn fold_with<F>(self, folder: F) -> F
        where
            F: Folder<Self::Item>;
    }

A variant on `Producer` which does not know its exact length or cannot represent it in a `usize`. These producers act like ordinary producers except that they cannot be told to split at a particular point. Instead, you just ask them to split 'somewhere'.

(In principle, `Producer` could extend this trait; however, it does not because to do so would require producers to carry their own length with them.)

## Associated Types

### `type Item`

The type of item returned by this producer.

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## Required methods

### `fn split(self) -> (Self, Option<Self>)`

Split midway into a new producer if possible, otherwise return `None`.

### `fn fold_with<F>(self, folder: F) -> F where
F: Folder<Self::Item>,`

Iterate the producer, feeding each element to `folder`, and stop when the folder is full (or all elements have been consumed).

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## Implementors

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