qubit-function 0.15.0

Functional programming traits and Box/Rc/Arc adapters for Rust, inspired by Java functional interfaces
Documentation 
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/*******************************************************************************
 *
 *    Copyright (c) 2025 - 2026 Haixing Hu.
 *
 *    SPDX-License-Identifier: Apache-2.0
 *
 *    Licensed under the Apache License, Version 2.0.
 *
 ******************************************************************************/
//! Defines the `RcStatefulTester` public type.

use std::{
    cell::RefCell,
    ops::Not,
};

use super::{
    Rc,
    StatefulTester,
    box_stateful_tester::BoxStatefulTester,
};

type RcStatefulTesterFn = Rc<RefCell<dyn FnMut() -> bool>>;

/// A single-threaded shared stateful tester backed by `Rc<RefCell<_>>`.
///
/// Clones of an `RcStatefulTester` share the same mutable closure state.
pub struct RcStatefulTester {
    pub(super) function: RcStatefulTesterFn,
}

impl RcStatefulTester {
    /// Creates a new single-threaded shared stateful tester.
    #[inline]
    pub fn new<F>(f: F) -> Self
    where
        F: FnMut() -> bool + 'static,
    {
        RcStatefulTester {
            function: Rc::new(RefCell::new(f)),
        }
    }

    /// Combines this tester with another stateful tester using logical AND.
    #[inline]
    pub fn and<T>(&self, mut next: T) -> RcStatefulTester
    where
        T: StatefulTester + 'static,
    {
        let self_fn = Rc::clone(&self.function);
        RcStatefulTester::new(move || {
            let matched = (self_fn.borrow_mut())();
            matched && next.test()
        })
    }

    /// Combines this tester with another stateful tester using logical OR.
    #[inline]
    pub fn or<T>(&self, mut next: T) -> RcStatefulTester
    where
        T: StatefulTester + 'static,
    {
        let self_fn = Rc::clone(&self.function);
        RcStatefulTester::new(move || {
            let matched = (self_fn.borrow_mut())();
            matched || next.test()
        })
    }

    /// Combines this tester with another stateful tester using logical NAND.
    #[inline]
    pub fn nand<T>(&self, mut next: T) -> RcStatefulTester
    where
        T: StatefulTester + 'static,
    {
        let self_fn = Rc::clone(&self.function);
        RcStatefulTester::new(move || {
            let matched = (self_fn.borrow_mut())();
            !(matched && next.test())
        })
    }

    /// Combines this tester with another stateful tester using logical XOR.
    #[inline]
    pub fn xor<T>(&self, mut next: T) -> RcStatefulTester
    where
        T: StatefulTester + 'static,
    {
        let self_fn = Rc::clone(&self.function);
        RcStatefulTester::new(move || {
            let matched = (self_fn.borrow_mut())();
            matched ^ next.test()
        })
    }

    /// Combines this tester with another stateful tester using logical NOR.
    #[inline]
    pub fn nor<T>(&self, mut next: T) -> RcStatefulTester
    where
        T: StatefulTester + 'static,
    {
        let self_fn = Rc::clone(&self.function);
        RcStatefulTester::new(move || {
            let matched = (self_fn.borrow_mut())();
            !(matched || next.test())
        })
    }
}

impl Clone for RcStatefulTester {
    #[inline]
    fn clone(&self) -> Self {
        RcStatefulTester {
            function: Rc::clone(&self.function),
        }
    }
}

impl Not for RcStatefulTester {
    type Output = RcStatefulTester;

    #[inline]
    fn not(self) -> Self::Output {
        let function = self.function;
        RcStatefulTester::new(move || !((function.borrow_mut())()))
    }
}

impl Not for &RcStatefulTester {
    type Output = RcStatefulTester;

    #[inline]
    fn not(self) -> Self::Output {
        let function = Rc::clone(&self.function);
        RcStatefulTester::new(move || !((function.borrow_mut())()))
    }
}

impl StatefulTester for RcStatefulTester {
    #[inline]
    fn test(&mut self) -> bool {
        (self.function.borrow_mut())()
    }

    #[inline]
    fn into_box(self) -> BoxStatefulTester {
        let function = self.function;
        BoxStatefulTester::new(move || (function.borrow_mut())())
    }

    #[inline]
    fn into_rc(self) -> RcStatefulTester {
        self
    }
}