qubit-function 0.18.1

Functional programming traits and Box/Rc/Arc adapters for Rust, inspired by Java functional interfaces
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// =============================================================================
//    Copyright (c) 2026 Haixing Hu.
//
//    SPDX-License-Identifier: Apache-2.0
//
//    Licensed under the Apache License, Version 2.0.
// =============================================================================

use qubit_function::{
    BoxFunction,
    Function,
};

#[test]
fn test_callback_metadata_contract_is_observable_through_box_function() {
    let unnamed = BoxFunction::<i32, i32>::new(|value: &i32| *value);
    assert_eq!(unnamed.name(), None);
    assert_eq!(unnamed.apply(&7), 7);

    let mut optionally_unnamed =
        BoxFunction::<i32, i32>::new_with_optional_name(
            |value: &i32| *value + 1,
            None,
        );
    assert_eq!(optionally_unnamed.name(), None);
    assert_eq!(optionally_unnamed.apply(&7), 8);

    optionally_unnamed.set_name("increment");
    assert_eq!(optionally_unnamed.name(), Some("increment"));
    optionally_unnamed.set_name("increment");
    assert_eq!(optionally_unnamed.name(), Some("increment"));

    optionally_unnamed.clear_name();
    assert_eq!(optionally_unnamed.name(), None);
}