qubit_codec/value/value_codec_registry_error.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
9//! Value-codec registry errors.
10
11use thiserror::Error;
12
13use crate::ValueCodecRegistrationSource;
14
15/// Failure while freezing a value-codec registry.
16///
17/// Freezing rejects a registry that has two registrations under one stable
18/// ID, and reports the first conflicting ID together with the two declaration
19/// sites that form the first conflicting pair.
20///
21/// # Examples
22///
23/// ```
24/// use qubit_codec::ValueCodecRegistrationSource;
25/// use qubit_codec::ValueCodecRegistryError;
26///
27/// let error = ValueCodecRegistryError::DuplicateId {
28/// id: "example.u32",
29/// sources: vec![ValueCodecRegistrationSource::new(
30/// "qubit-codec",
31/// "my_crate::codecs",
32/// "src/codec.rs",
33/// 42,
34/// )],
35/// };
36/// assert!(error.to_string().starts_with("duplicate value codec ID example.u32"));
37/// ```
38#[derive(Clone, Debug, Error)]
39#[must_use]
40pub enum ValueCodecRegistryError {
41 /// Multiple registrations claim one stable ID.
42 #[error("duplicate value codec ID {id} from {sources:?}")]
43 DuplicateId {
44 /// Conflicting stable ID.
45 id: &'static str,
46 /// Registration sources in deterministic order.
47 sources: Vec<ValueCodecRegistrationSource>,
48 },
49}