Trait ExactSizeEncoder 

pub trait ExactSizeEncoder: Encoder {
    // Required method
    fn len(&self) -> usize;

    // Provided method
    fn is_empty(&self) -> bool { ... }
}

An encoder with a known size.

Required Methods

fn len(&self) -> usize

The number of bytes remaining that the encoder will yield.

Provided Methods

fn is_empty(&self) -> bool

Returns whether the encoder would yield an empty response.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<T: Encoder + ExactSizeEncoder> ExactSizeEncoder for Option<T>

fn len(&self) -> usize

Implementors

impl ExactSizeEncoder for CompactSizeEncoder

impl<'e, T> ExactSizeEncoder for SliceEncoder<'e, T>

where T: Encodable + 'e, T::Encoder<'e>: ExactSizeEncoder,

impl<'sl> ExactSizeEncoder for BytesEncoder<'sl>

impl<A, B, C, D, E, F> ExactSizeEncoder for Encoder6<A, B, C, D, E, F>

where A: Encoder + ExactSizeEncoder, B: Encoder + ExactSizeEncoder, C: Encoder + ExactSizeEncoder, D: Encoder + ExactSizeEncoder, E: Encoder + ExactSizeEncoder, F: Encoder + ExactSizeEncoder,

impl<A, B, C, D> ExactSizeEncoder for Encoder4<A, B, C, D>

where A: Encoder + ExactSizeEncoder, B: Encoder + ExactSizeEncoder, C: Encoder + ExactSizeEncoder, D: Encoder + ExactSizeEncoder,

impl<A, B, C> ExactSizeEncoder for Encoder3<A, B, C>

where A: Encoder + ExactSizeEncoder, B: Encoder + ExactSizeEncoder, C: Encoder + ExactSizeEncoder,

impl<A, B> ExactSizeEncoder for Encoder2<A, B>

where A: Encoder + ExactSizeEncoder, B: Encoder + ExactSizeEncoder,

impl<const N: usize> ExactSizeEncoder for ArrayEncoder<N>

impl<const N: usize> ExactSizeEncoder for ArrayRefEncoder<'_, N>