qubit-function 0.14.0

Functional programming traits and Box/Rc/Arc adapters for Rust, inspired by Java functional interfaces
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105

/*******************************************************************************
 *
 *    Copyright (c) 2025 - 2026 Haixing Hu.
 *
 *    SPDX-License-Identifier: Apache-2.0
 *
 *    Licensed under the Apache License, Version 2.0.
 *
 ******************************************************************************/
// qubit-style: allow explicit-imports
//! Defines the `ArcTransformer` public type.

use super::{
    Arc,
    ArcConditionalTransformer,
    BoxTransformer,
    BoxTransformerOnce,
    Predicate,
    RcTransformer,
    Transformer,
    impl_arc_conversions,
    impl_closure_trait,
    impl_shared_transformer_methods,
    impl_transformer_clone,
    impl_transformer_common_methods,
    impl_transformer_constant_method,
    impl_transformer_debug_display,
};

// ============================================================================
// ArcTransformer - Arc<dyn Fn(T) -> R + Send + Sync>
// ============================================================================

/// ArcTransformer - thread-safe transformer wrapper
///
/// A thread-safe, clonable transformer wrapper suitable for multi-threaded
/// scenarios. Can be called multiple times and shared across threads.
///
/// # Features
///
/// - **Based on**: `Arc<dyn Fn(T) -> R + Send + Sync>`
/// - **Ownership**: Shared ownership via reference counting
/// - **Reusability**: Can be called multiple times (each call consumes its
///   input)
/// - **Thread Safety**: Thread-safe (`Send + Sync` required)
/// - **Clonable**: Cheap cloning via `Arc::clone`
///
pub struct ArcTransformer<T, R> {
    pub(super) function: Arc<dyn Fn(T) -> R + Send + Sync>,
    pub(super) name: Option<String>,
}

// Implement ArcTransformer
impl<T, R> ArcTransformer<T, R> {
    impl_transformer_common_methods!(
        ArcTransformer<T, R>,
        (Fn(T) -> R + Send + Sync + 'static),
        |f| Arc::new(f)
    );

    impl_shared_transformer_methods!(
        ArcTransformer<T, R>,
        ArcConditionalTransformer,
        into_arc,
        Transformer,
        Send + Sync + 'static
    );
}

// Implement constant method for ArcTransformer
impl_transformer_constant_method!(thread_safe ArcTransformer<T, R>);

// Implement Debug and Display for ArcTransformer
impl_transformer_debug_display!(ArcTransformer<T, R>);

// Implement Clone for ArcTransformer
impl_transformer_clone!(ArcTransformer<T, R>);

// Implement Transformer for ArcTransformer
impl<T, R> Transformer<T, R> for ArcTransformer<T, R> {
    fn apply(&self, input: T) -> R {
        (self.function)(input)
    }

    // Use macro to implement conversion methods
    impl_arc_conversions!(
        ArcTransformer<T, R>,
        BoxTransformer,
        RcTransformer,
        BoxTransformerOnce,
        Fn(t: T) -> R
    );
}

// ============================================================================
// Blanket implementation for standard Fn trait
// ============================================================================

// Implement Transformer<T, R> for any type that implements Fn(T) -> R
impl_closure_trait!(
    Transformer<T, R>,
    apply,
    BoxTransformerOnce,
    Fn(input: T) -> R
);