qubit-codec 0.11.0

Core codec traits and buffer conversion primitives for Rust
Documentation 
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// =============================================================================
//    Copyright (c) 2026 Haixing Hu.
//
//    SPDX-License-Identifier: Apache-2.0
//
//    Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Semantic marker trait for buffered encoders.

use super::{
    TranscodeEncodeError,
    Transcoder,
};

/// Encodes logical values into encoded units over caller-provided buffers.
///
/// `TranscodeEncoder` refines [`Transcoder`] for implementations whose
/// input is the logical value stream and whose output is the encoded unit
/// stream. The trait adds no methods; it exists to make generic bounds
/// distinguish encoding direction from decoding and unit-to-unit conversion.
///
/// The word "buffered" describes the caller-managed buffer and progress model.
/// It does not require the implementor to own an internal buffer. An encoder
/// may retain consumed input internally, but [`Transcoder::transcode`] must
/// consume every visible input value before returning
/// [`crate::TranscodeStatus::Complete`] and must never return
/// [`crate::TranscodeStatus::NeedInput`]. It returns
/// [`crate::TranscodeStatus::NeedOutput`] when more output capacity is needed;
/// [`Transcoder::finish`] emits any retained output after the caller has
/// supplied the complete logical input stream.
pub trait TranscodeEncoder:
    Transcoder<
    Error = TranscodeEncodeError<
        Self::EncodeError,
        <Self as Transcoder>::Input,
    >,
>
{
    /// Domain error type produced by encode internals.
    type EncodeError;
}