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use crate::{Allocator, Context};
use super::{Decoder, SizeHint};
/// Trait governing how to decode a map entry.
pub trait EntryDecoder<'de> {
/// Context associated with the decoder.
type Cx: Context<Error = Self::Error, Allocator = Self::Allocator>;
/// Error associated with decoding.
type Error;
/// The allocator associated with the decoder.
type Allocator: Allocator;
/// The mode of the decoder.
type Mode: 'static;
/// The decoder to use for a tuple field index.
type DecodeKey<'this>: Decoder<
'de,
Cx = Self::Cx,
Error = Self::Error,
Allocator = Self::Allocator,
Mode = Self::Mode,
>
where
Self: 'this;
/// The decoder to use for a tuple field value.
type DecodeValue: Decoder<
'de,
Cx = Self::Cx,
Error = Self::Error,
Allocator = Self::Allocator,
Mode = Self::Mode,
>;
/// Access the context associated with the decoder.
fn cx(&self) -> Self::Cx;
/// Get a size hint for the size of the map being decoded.
#[inline]
fn size_hint(&self) -> SizeHint {
SizeHint::any()
}
/// Return the decoder for the first value in the pair.
///
/// If this is a map the first value would be the key of the map, if this is
/// a struct the first value would be the field of the struct.
#[must_use = "Decoders must be consumed"]
fn decode_key(&mut self) -> Result<Self::DecodeKey<'_>, Self::Error>;
/// Decode the second value in the pair..
#[must_use = "Decoders must be consumed"]
fn decode_value(self) -> Result<Self::DecodeValue, Self::Error>;
}