qubit-function 0.18.0

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::{
    BoxStatefulPredicate,
    StatefulPredicate,
};

#[test]
fn test_box_stateful_predicate_observable_behavior() {
    let mut predicate = BoxStatefulPredicate::new(|value: &i32| *value > 0);
    assert!(predicate.test(&1));
    assert!(!predicate.test(&-1));
}