pub trait Decode<X: CustomValueKind, D: Decoder<X>>: Sized {
// Required method
fn decode_body_with_value_kind(
decoder: &mut D,
value_kind: ValueKind<X>,
) -> Result<Self, DecodeError>;
}Expand description
A data structure that can be decoded from a byte array using SBOR.
Required Methods§
Sourcefn decode_body_with_value_kind(
decoder: &mut D,
value_kind: ValueKind<X>,
) -> Result<Self, DecodeError>
fn decode_body_with_value_kind( decoder: &mut D, value_kind: ValueKind<X>, ) -> Result<Self, DecodeError>
Decodes the type from the decoder, which should match a preloaded value kind.
You may want to call decoder.decode_deeper_body_with_value_kind instead of this method. See
the below section for details.
§Direct calls and SBOR Depth
In order to avoid SBOR depth differentials and disagreement about whether a payload
is valid, typed codec implementations should ensure that the SBOR depth as measured
during the encoding/decoding process agrees with the SBOR Value codec.
Each layer of the SBOR Value counts as one depth.
If the decoder you’re writing is embedding a child type (and is represented as such
in the SBOR Value type), then you should call decoder.decode_body_with_value_kind to increment
the SBOR depth tracker.
You should only call T::decode_body_with_value_kind directly when the decoding of that type
into an SBOR Value doesn’t increase the SBOR depth in the decoder, that is:
- When the wrapping type is invisible to the SBOR
Value, ie:- Smart pointers
- Transparent wrappers
- Where the use of the inner type is invisible to SBOR
Value, ie:- Where the use of
T::decode_body_with_value_kindis coincidental / code re-use
- Where the use of
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.