[−][src]Trait destream::de::MapAccess

pub trait MapAccess: Send {
    type Error: Error;
#[must_use]    pub fn next_key<'life0, 'async_trait, K: FromStream>(
        &'life0 mut self
    ) -> Pin<Box<dyn Future<Output = Result<Option<K>, Self::Error>> + Send + 'async_trait>>
    where
        K: 'async_trait,
        'life0: 'async_trait,
        Self: 'async_trait;

#[must_use]    pub fn next_value<'life0, 'async_trait, V: FromStream>(
        &'life0 mut self
    ) -> Pin<Box<dyn Future<Output = Result<V, Self::Error>> + Send + 'async_trait>>
    where
        V: 'async_trait,
        'life0: 'async_trait,
        Self: 'async_trait;

#[must_use]    pub fn next_entry<'life0, 'async_trait, K: FromStream, V: FromStream>(
        &'life0 mut self
    ) -> Pin<Box<dyn Future<Output = Result<Option<(K, V)>, Self::Error>> + Send + 'async_trait>>
    where
        K: 'async_trait,
        V: 'async_trait,
        'life0: 'async_trait,
        Self: 'async_trait;

    pub fn size_hint(&self) -> Option<usize> { ... }
}

Provides a Visitor access to each entry of a map in the input.

This is a trait that a Decoder passes to a Visitor implementation.

Associated Types

type Error: Error[src]

Type to return in case of a decoding error.

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Required methods

#[must_use]pub fn next_key<'life0, 'async_trait, K: FromStream>(
    &'life0 mut self
) -> Pin<Box<dyn Future<Output = Result<Option<K>, Self::Error>> + Send + 'async_trait>> where
    K: 'async_trait,
    'life0: 'async_trait,
    Self: 'async_trait, [src]

This returns Ok(Some(key)) for the next key in the map, or Ok(None) if there are no more remaining entries.

#[must_use]pub fn next_value<'life0, 'async_trait, V: FromStream>(
    &'life0 mut self
) -> Pin<Box<dyn Future<Output = Result<V, Self::Error>> + Send + 'async_trait>> where
    V: 'async_trait,
    'life0: 'async_trait,
    Self: 'async_trait, [src]

This returns a Ok(value) for the next value in the map.

Panics

Calling next_value before next_key is incorrect and is allowed to panic or return bogus results.

#[must_use]pub fn next_entry<'life0, 'async_trait, K: FromStream, V: FromStream>(
    &'life0 mut self
) -> Pin<Box<dyn Future<Output = Result<Option<(K, V)>, Self::Error>> + Send + 'async_trait>> where
    K: 'async_trait,
    V: 'async_trait,
    'life0: 'async_trait,
    Self: 'async_trait, [src]

This returns Ok(Some((key, value))) for the next (key-value) pair in the map, or Ok(None) if there are no more remaining items.

This method exists as a convenience for FromStream implementations. MapAccess implementations should not override the default behavior.

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Provided methods

pub fn size_hint(&self) -> Option<usize>[src]

Returns the number of entries remaining in the map, if known.

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Implementors

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