Trait ChainSourceSegment 

pub trait ChainSourceSegment: ChainSegment {
    // Required method
    fn poll_next<'life0, 'async_trait>(
        &'life0 mut self,
    ) -> Pin<Box<dyn Future<Output = StreamResult<Option<Box<dyn Any + Send>>>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait;
}

Source head: pull one record; None when the source is idle or finished.

Required Methods

fn poll_next<'life0, 'async_trait>( &'life0 mut self, ) -> Pin<Box<dyn Future<Output = StreamResult<Option<Box<dyn Any + Send>>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors