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qubit_codec/transcode/
transcode_converter.rs

1// =============================================================================
2//    Copyright (c) 2026 Haixing Hu.
3//
4//    SPDX-License-Identifier: Apache-2.0
5//
6//    Licensed under the Apache License, Version 2.0.
7// =============================================================================
8//! Semantic marker trait for buffered converters.
9
10use super::{
11    TranscodeConvertError,
12    Transcoder,
13};
14
15/// Converts encoded units of one representation into encoded units of another.
16///
17/// `TranscodeConverter` refines [`Transcoder`] for implementations whose
18/// input and output are both encoded unit streams. Any intermediate logical
19/// values are implementation details of the concrete converter.
20///
21/// The trait adds no methods. It exists to make generic bounds distinguish
22/// unit-to-unit conversion from value-to-unit encoding and unit-to-value
23/// decoding.
24pub trait TranscodeConverter:
25    Transcoder<
26    Error = TranscodeConvertError<
27        Self::DecodeError,
28        Self::EncodeError,
29        Self::Value,
30    >,
31>
32{
33    /// Domain error type produced by source decoding.
34    type DecodeError;
35
36    /// Domain error type produced by target encoding.
37    type EncodeError;
38
39    /// Intermediate logical value type converted between source and target.
40    type Value;
41}