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////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2025 Haixing Hu
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////////////
//! Traits for code property functionality
//!
//! # Author
//!
//! Haixing Hu
/// A trait indicating that an entity class has a code property
///
/// This trait provides access and setting functionality for the code of
/// domain objects, where the code is usually a globally unique identifier.
///
/// # Example
///
/// ```rust
/// use qubit_mixin::WithCode;
///
/// struct Product {
/// code: String,
/// name: String,
/// }
///
/// impl WithCode for Product {
/// fn code(&self) -> &str {
/// &self.code
/// }
///
/// fn set_code(&mut self, code: &str) {
/// self.code = code.to_string();
/// }
/// }
///
/// let mut product = Product {
/// code: "PROD001".to_string(),
/// name: "Widget".to_string(),
/// };
/// assert_eq!(product.code(), "PROD001");
///
/// product.set_code("PROD002");
/// assert_eq!(product.code(), "PROD002");
/// ```
///
/// # Author
///
/// Haixing Hu