Struct BoxBiConsumerOnce 

pub struct BoxBiConsumerOnce<T, U> { /* private fields */ }

BoxBiConsumerOnce struct

A one-time bi-consumer implementation based on Box<dyn FnOnce(&T, &U)> for single ownership scenarios. This is the simplest one-time bi-consumer type for truly one-time use.

Features

• Single Ownership: Not cloneable, ownership moves on use
• Zero Overhead: No reference counting or locking
• One-Time Use: Consumes self on first call
• Builder Pattern: Method chaining consumes self naturally

Use Cases

Choose BoxBiConsumerOnce when:

• The bi-consumer is truly used only once
• Building pipelines where ownership naturally flows
• The consumer captures values that should be consumed
• Performance is critical and sharing overhead is unacceptable

Performance

BoxBiConsumerOnce has the best performance:

• No reference counting overhead
• No lock acquisition or runtime borrow checking
• Direct function call through vtable
• Minimal memory footprint (single pointer)

Examples

use qubit_function::{BiConsumerOnce, BoxBiConsumerOnce};

let consumer = BoxBiConsumerOnce::new(|x: &i32, y: &i32| {
    println!("Sum: {}", x + y);
});
consumer.accept(&5, &3);

Author

Haixing Hu

Implementations

impl<T, U> BoxBiConsumerOnce<T, U>

pub fn new<F>(f: F) -> Self

where F: FnOnce(&T, &U) + 'static,

Creates a new bi-consumer.

Wraps the provided closure in the appropriate smart pointer type for this bi-consumer implementation.

Examples found in repository

examples/consumers/bi_consumer_once_demo.rs (lines 31-34)

fn main() {
    println!("=== BiConsumerOnce Demo ===\n");

    // 1. Basic usage
    println!("1. Basic usage:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Sum: {}", x + y);
    });
    consumer.accept(&10, &5);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 2. Method chaining
    println!("2. Method chaining:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let chained = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l1.lock().unwrap().push(*x + *y);
        println!("  First: sum={}", x + y);
    })
    .and_then(move |x: &i32, y: &i32| {
        l2.lock().unwrap().push(*x * *y);
        println!("  Second: product={}", x * y);
    });
    chained.accept(&5, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 3. Conditional execution - true case
    println!("3. Conditional execution - true case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&5, &3);
    println!("  Positive values: {:?}\n", *log.lock().unwrap());

    // 4. Conditional execution - false case
    println!("4. Conditional execution - false case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&-5, &3);
    println!("  Negative value (unchanged): {:?}\n", *log.lock().unwrap());

    // 5. Conditional branching
    println!("5. Conditional branching:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let branch = BoxBiConsumerOnce::new(move |x: &i32, _y: &i32| {
        l1.lock().unwrap().push(*x);
    })
    .when(|x: &i32, y: &i32| *x > *y)
    .or_else(move |_x: &i32, y: &i32| {
        l2.lock().unwrap().push(*y);
    });
    branch.accept(&15, &10);
    println!("  When x > y: {:?}\n", *log.lock().unwrap());

    // 6. Working with closures directly
    println!("6. Working with closures directly:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let closure = move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Processed: {}", x + y);
    };
    closure.accept(&10, &20);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 7. Moving captured values
    println!("7. Moving captured values:");
    let data = vec![1, 2, 3, 4, 5];
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        println!("  x={}, y={}", x, y);
        println!("  Captured data: {:?}", data);
        println!("  Data sum: {}", data.iter().sum::<i32>());
    });
    consumer.accept(&5, &3);
    // data is no longer available here
    println!();

    // 8. Initialization callback
    println!("8. Initialization callback:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let init_callback = BoxBiConsumerOnce::new(move |width: &i32, height: &i32| {
        println!("  Initializing with dimensions: {}x{}", width, height);
        l.lock().unwrap().push(*width * *height);
    });
    init_callback.accept(&800, &600);
    println!("  Areas: {:?}\n", *log.lock().unwrap());

    // 9. Cleanup callback
    println!("9. Cleanup callback:");
    let cleanup = BoxBiConsumerOnce::new(|count: &i32, total: &i32| {
        println!("  Cleanup: processed {} out of {} items", count, total);
        println!(
            "  Success rate: {:.1}%",
            (*count as f64 / *total as f64) * 100.0
        );
    });
    cleanup.accept(&85, &100);
    println!();

    // 10. Name support
    println!("10. Name support:");
    let mut named_consumer = BoxBiConsumerOnce::<i32, i32>::noop();
    println!("  Initial name: {:?}", named_consumer.name());

    named_consumer.set_name("init_callback");
    println!("  After setting name: {:?}", named_consumer.name());
    println!("  Display: {}", named_consumer);
    named_consumer.accept(&1, &2);
    println!();

    // 11. Print helpers
    println!("11. Print helpers:");
    let print = BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("{}, {}", x, y));
    print.accept(&42, &10);

    let print_with =
        BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("Dimensions: {}, {}", x, y));
    print_with.accept(&800, &600);
    println!();

    // 12. Converting to function
    println!("12. Converting to function:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    });
    let func = consumer.into_fn();
    func(&7, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    println!("=== Demo Complete ===");
}

pub fn new_with_name<F>(name: &str, f: F) -> Self

where F: FnOnce(&T, &U) + 'static,

Creates a new named bi-consumer.

Wraps the provided closure and assigns it a name, which is useful for debugging and logging purposes.

pub fn new_with_optional_name<F>(f: F, name: Option<String>) -> Self

where F: FnOnce(&T, &U) + 'static,

Creates a new named bi-consumer with an optional name.

Wraps the provided closure and assigns it an optional name.

pub fn name(&self) -> Option<&str>

Gets the name of this bi-consumer.

Returns

Returns Some(&str) if a name was set, None otherwise.

Examples found in repository

examples/consumers/bi_consumer_once_demo.rs (line 140)

fn main() {
    println!("=== BiConsumerOnce Demo ===\n");

    // 1. Basic usage
    println!("1. Basic usage:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Sum: {}", x + y);
    });
    consumer.accept(&10, &5);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 2. Method chaining
    println!("2. Method chaining:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let chained = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l1.lock().unwrap().push(*x + *y);
        println!("  First: sum={}", x + y);
    })
    .and_then(move |x: &i32, y: &i32| {
        l2.lock().unwrap().push(*x * *y);
        println!("  Second: product={}", x * y);
    });
    chained.accept(&5, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 3. Conditional execution - true case
    println!("3. Conditional execution - true case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&5, &3);
    println!("  Positive values: {:?}\n", *log.lock().unwrap());

    // 4. Conditional execution - false case
    println!("4. Conditional execution - false case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&-5, &3);
    println!("  Negative value (unchanged): {:?}\n", *log.lock().unwrap());

    // 5. Conditional branching
    println!("5. Conditional branching:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let branch = BoxBiConsumerOnce::new(move |x: &i32, _y: &i32| {
        l1.lock().unwrap().push(*x);
    })
    .when(|x: &i32, y: &i32| *x > *y)
    .or_else(move |_x: &i32, y: &i32| {
        l2.lock().unwrap().push(*y);
    });
    branch.accept(&15, &10);
    println!("  When x > y: {:?}\n", *log.lock().unwrap());

    // 6. Working with closures directly
    println!("6. Working with closures directly:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let closure = move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Processed: {}", x + y);
    };
    closure.accept(&10, &20);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 7. Moving captured values
    println!("7. Moving captured values:");
    let data = vec![1, 2, 3, 4, 5];
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        println!("  x={}, y={}", x, y);
        println!("  Captured data: {:?}", data);
        println!("  Data sum: {}", data.iter().sum::<i32>());
    });
    consumer.accept(&5, &3);
    // data is no longer available here
    println!();

    // 8. Initialization callback
    println!("8. Initialization callback:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let init_callback = BoxBiConsumerOnce::new(move |width: &i32, height: &i32| {
        println!("  Initializing with dimensions: {}x{}", width, height);
        l.lock().unwrap().push(*width * *height);
    });
    init_callback.accept(&800, &600);
    println!("  Areas: {:?}\n", *log.lock().unwrap());

    // 9. Cleanup callback
    println!("9. Cleanup callback:");
    let cleanup = BoxBiConsumerOnce::new(|count: &i32, total: &i32| {
        println!("  Cleanup: processed {} out of {} items", count, total);
        println!(
            "  Success rate: {:.1}%",
            (*count as f64 / *total as f64) * 100.0
        );
    });
    cleanup.accept(&85, &100);
    println!();

    // 10. Name support
    println!("10. Name support:");
    let mut named_consumer = BoxBiConsumerOnce::<i32, i32>::noop();
    println!("  Initial name: {:?}", named_consumer.name());

    named_consumer.set_name("init_callback");
    println!("  After setting name: {:?}", named_consumer.name());
    println!("  Display: {}", named_consumer);
    named_consumer.accept(&1, &2);
    println!();

    // 11. Print helpers
    println!("11. Print helpers:");
    let print = BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("{}, {}", x, y));
    print.accept(&42, &10);

    let print_with =
        BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("Dimensions: {}, {}", x, y));
    print_with.accept(&800, &600);
    println!();

    // 12. Converting to function
    println!("12. Converting to function:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    });
    let func = consumer.into_fn();
    func(&7, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    println!("=== Demo Complete ===");
}

pub fn set_name(&mut self, name: &str)

Sets the name of this bi-consumer.

Parameters

• name - The name to set for this bi-consumer

Examples found in repository

examples/consumers/bi_consumer_once_demo.rs (line 142)

fn main() {
    println!("=== BiConsumerOnce Demo ===\n");

    // 1. Basic usage
    println!("1. Basic usage:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Sum: {}", x + y);
    });
    consumer.accept(&10, &5);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 2. Method chaining
    println!("2. Method chaining:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let chained = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l1.lock().unwrap().push(*x + *y);
        println!("  First: sum={}", x + y);
    })
    .and_then(move |x: &i32, y: &i32| {
        l2.lock().unwrap().push(*x * *y);
        println!("  Second: product={}", x * y);
    });
    chained.accept(&5, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 3. Conditional execution - true case
    println!("3. Conditional execution - true case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&5, &3);
    println!("  Positive values: {:?}\n", *log.lock().unwrap());

    // 4. Conditional execution - false case
    println!("4. Conditional execution - false case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&-5, &3);
    println!("  Negative value (unchanged): {:?}\n", *log.lock().unwrap());

    // 5. Conditional branching
    println!("5. Conditional branching:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let branch = BoxBiConsumerOnce::new(move |x: &i32, _y: &i32| {
        l1.lock().unwrap().push(*x);
    })
    .when(|x: &i32, y: &i32| *x > *y)
    .or_else(move |_x: &i32, y: &i32| {
        l2.lock().unwrap().push(*y);
    });
    branch.accept(&15, &10);
    println!("  When x > y: {:?}\n", *log.lock().unwrap());

    // 6. Working with closures directly
    println!("6. Working with closures directly:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let closure = move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Processed: {}", x + y);
    };
    closure.accept(&10, &20);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 7. Moving captured values
    println!("7. Moving captured values:");
    let data = vec![1, 2, 3, 4, 5];
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        println!("  x={}, y={}", x, y);
        println!("  Captured data: {:?}", data);
        println!("  Data sum: {}", data.iter().sum::<i32>());
    });
    consumer.accept(&5, &3);
    // data is no longer available here
    println!();

    // 8. Initialization callback
    println!("8. Initialization callback:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let init_callback = BoxBiConsumerOnce::new(move |width: &i32, height: &i32| {
        println!("  Initializing with dimensions: {}x{}", width, height);
        l.lock().unwrap().push(*width * *height);
    });
    init_callback.accept(&800, &600);
    println!("  Areas: {:?}\n", *log.lock().unwrap());

    // 9. Cleanup callback
    println!("9. Cleanup callback:");
    let cleanup = BoxBiConsumerOnce::new(|count: &i32, total: &i32| {
        println!("  Cleanup: processed {} out of {} items", count, total);
        println!(
            "  Success rate: {:.1}%",
            (*count as f64 / *total as f64) * 100.0
        );
    });
    cleanup.accept(&85, &100);
    println!();

    // 10. Name support
    println!("10. Name support:");
    let mut named_consumer = BoxBiConsumerOnce::<i32, i32>::noop();
    println!("  Initial name: {:?}", named_consumer.name());

    named_consumer.set_name("init_callback");
    println!("  After setting name: {:?}", named_consumer.name());
    println!("  Display: {}", named_consumer);
    named_consumer.accept(&1, &2);
    println!();

    // 11. Print helpers
    println!("11. Print helpers:");
    let print = BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("{}, {}", x, y));
    print.accept(&42, &10);

    let print_with =
        BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("Dimensions: {}, {}", x, y));
    print_with.accept(&800, &600);
    println!();

    // 12. Converting to function
    println!("12. Converting to function:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    });
    let func = consumer.into_fn();
    func(&7, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    println!("=== Demo Complete ===");
}

pub fn clear_name(&mut self)

Clears the name of this bi-consumer.

pub fn noop() -> Self

Creates a no-operation bi-consumer.

Creates a bi-consumer that does nothing when called. Useful for default values or placeholder implementations.

Returns

Returns a new bi-consumer instance that performs no operation.

Examples found in repository

examples/consumers/bi_consumer_once_demo.rs (line 139)

fn main() {
    println!("=== BiConsumerOnce Demo ===\n");

    // 1. Basic usage
    println!("1. Basic usage:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Sum: {}", x + y);
    });
    consumer.accept(&10, &5);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 2. Method chaining
    println!("2. Method chaining:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let chained = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l1.lock().unwrap().push(*x + *y);
        println!("  First: sum={}", x + y);
    })
    .and_then(move |x: &i32, y: &i32| {
        l2.lock().unwrap().push(*x * *y);
        println!("  Second: product={}", x * y);
    });
    chained.accept(&5, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 3. Conditional execution - true case
    println!("3. Conditional execution - true case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&5, &3);
    println!("  Positive values: {:?}\n", *log.lock().unwrap());

    // 4. Conditional execution - false case
    println!("4. Conditional execution - false case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&-5, &3);
    println!("  Negative value (unchanged): {:?}\n", *log.lock().unwrap());

    // 5. Conditional branching
    println!("5. Conditional branching:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let branch = BoxBiConsumerOnce::new(move |x: &i32, _y: &i32| {
        l1.lock().unwrap().push(*x);
    })
    .when(|x: &i32, y: &i32| *x > *y)
    .or_else(move |_x: &i32, y: &i32| {
        l2.lock().unwrap().push(*y);
    });
    branch.accept(&15, &10);
    println!("  When x > y: {:?}\n", *log.lock().unwrap());

    // 6. Working with closures directly
    println!("6. Working with closures directly:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let closure = move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Processed: {}", x + y);
    };
    closure.accept(&10, &20);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 7. Moving captured values
    println!("7. Moving captured values:");
    let data = vec![1, 2, 3, 4, 5];
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        println!("  x={}, y={}", x, y);
        println!("  Captured data: {:?}", data);
        println!("  Data sum: {}", data.iter().sum::<i32>());
    });
    consumer.accept(&5, &3);
    // data is no longer available here
    println!();

    // 8. Initialization callback
    println!("8. Initialization callback:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let init_callback = BoxBiConsumerOnce::new(move |width: &i32, height: &i32| {
        println!("  Initializing with dimensions: {}x{}", width, height);
        l.lock().unwrap().push(*width * *height);
    });
    init_callback.accept(&800, &600);
    println!("  Areas: {:?}\n", *log.lock().unwrap());

    // 9. Cleanup callback
    println!("9. Cleanup callback:");
    let cleanup = BoxBiConsumerOnce::new(|count: &i32, total: &i32| {
        println!("  Cleanup: processed {} out of {} items", count, total);
        println!(
            "  Success rate: {:.1}%",
            (*count as f64 / *total as f64) * 100.0
        );
    });
    cleanup.accept(&85, &100);
    println!();

    // 10. Name support
    println!("10. Name support:");
    let mut named_consumer = BoxBiConsumerOnce::<i32, i32>::noop();
    println!("  Initial name: {:?}", named_consumer.name());

    named_consumer.set_name("init_callback");
    println!("  After setting name: {:?}", named_consumer.name());
    println!("  Display: {}", named_consumer);
    named_consumer.accept(&1, &2);
    println!();

    // 11. Print helpers
    println!("11. Print helpers:");
    let print = BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("{}, {}", x, y));
    print.accept(&42, &10);

    let print_with =
        BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("Dimensions: {}, {}", x, y));
    print_with.accept(&800, &600);
    println!();

    // 12. Converting to function
    println!("12. Converting to function:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    });
    let func = consumer.into_fn();
    func(&7, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    println!("=== Demo Complete ===");
}

pub fn when<P>(self, predicate: P) -> BoxConditionalBiConsumerOnce<T, U>

where T: 'static, U: 'static, P: BiPredicate<T, U> + 'static,

Creates a conditional two-parameter consumer that executes based on bi-predicate result.

Parameters

• predicate - The bi-predicate to determine whether to execute the consumption operation

Returns

Returns a conditional two-parameter consumer that only executes when the predicate returns true.

Examples

use std::sync::Arc;
use std::sync::atomic::{AtomicI32, Ordering};
use qubit_function::consumers::*;

let counter = Arc::new(AtomicI32::new(0));
let bi_consumer = BoxBiConsumer::new({
    let counter = Arc::clone(&counter);
    move |key: &String, value: &i32| {
        if key == "increment" {
            counter.fetch_add(*value, Ordering::SeqCst);
        }
    }
});

let conditional = bi_consumer.when(|key: &String, value: &i32| *value > 0);
conditional.accept(&"increment".to_string(), &5);  // counter = 5
conditional.accept(&"increment".to_string(), &-2); // not executed

Examples found in repository

examples/consumers/bi_consumer_once_demo.rs (line 61)

fn main() {
    println!("=== BiConsumerOnce Demo ===\n");

    // 1. Basic usage
    println!("1. Basic usage:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Sum: {}", x + y);
    });
    consumer.accept(&10, &5);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 2. Method chaining
    println!("2. Method chaining:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let chained = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l1.lock().unwrap().push(*x + *y);
        println!("  First: sum={}", x + y);
    })
    .and_then(move |x: &i32, y: &i32| {
        l2.lock().unwrap().push(*x * *y);
        println!("  Second: product={}", x * y);
    });
    chained.accept(&5, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 3. Conditional execution - true case
    println!("3. Conditional execution - true case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&5, &3);
    println!("  Positive values: {:?}\n", *log.lock().unwrap());

    // 4. Conditional execution - false case
    println!("4. Conditional execution - false case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&-5, &3);
    println!("  Negative value (unchanged): {:?}\n", *log.lock().unwrap());

    // 5. Conditional branching
    println!("5. Conditional branching:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let branch = BoxBiConsumerOnce::new(move |x: &i32, _y: &i32| {
        l1.lock().unwrap().push(*x);
    })
    .when(|x: &i32, y: &i32| *x > *y)
    .or_else(move |_x: &i32, y: &i32| {
        l2.lock().unwrap().push(*y);
    });
    branch.accept(&15, &10);
    println!("  When x > y: {:?}\n", *log.lock().unwrap());

    // 6. Working with closures directly
    println!("6. Working with closures directly:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let closure = move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Processed: {}", x + y);
    };
    closure.accept(&10, &20);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 7. Moving captured values
    println!("7. Moving captured values:");
    let data = vec![1, 2, 3, 4, 5];
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        println!("  x={}, y={}", x, y);
        println!("  Captured data: {:?}", data);
        println!("  Data sum: {}", data.iter().sum::<i32>());
    });
    consumer.accept(&5, &3);
    // data is no longer available here
    println!();

    // 8. Initialization callback
    println!("8. Initialization callback:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let init_callback = BoxBiConsumerOnce::new(move |width: &i32, height: &i32| {
        println!("  Initializing with dimensions: {}x{}", width, height);
        l.lock().unwrap().push(*width * *height);
    });
    init_callback.accept(&800, &600);
    println!("  Areas: {:?}\n", *log.lock().unwrap());

    // 9. Cleanup callback
    println!("9. Cleanup callback:");
    let cleanup = BoxBiConsumerOnce::new(|count: &i32, total: &i32| {
        println!("  Cleanup: processed {} out of {} items", count, total);
        println!(
            "  Success rate: {:.1}%",
            (*count as f64 / *total as f64) * 100.0
        );
    });
    cleanup.accept(&85, &100);
    println!();

    // 10. Name support
    println!("10. Name support:");
    let mut named_consumer = BoxBiConsumerOnce::<i32, i32>::noop();
    println!("  Initial name: {:?}", named_consumer.name());

    named_consumer.set_name("init_callback");
    println!("  After setting name: {:?}", named_consumer.name());
    println!("  Display: {}", named_consumer);
    named_consumer.accept(&1, &2);
    println!();

    // 11. Print helpers
    println!("11. Print helpers:");
    let print = BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("{}, {}", x, y));
    print.accept(&42, &10);

    let print_with =
        BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("Dimensions: {}, {}", x, y));
    print_with.accept(&800, &600);
    println!();

    // 12. Converting to function
    println!("12. Converting to function:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    });
    let func = consumer.into_fn();
    func(&7, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    println!("=== Demo Complete ===");
}

pub fn and_then<C>(self, after: C) -> BoxBiConsumerOnce<T, U>

where Self: Sized + 'static, T: 'static, U: 'static, C: BiConsumerOnce<T, U> + 'static,

Chains execution with another two-parameter consumer, executing the current consumer first, then the subsequent consumer.

Parameters

• after - The subsequent two-parameter consumer to execute after the current consumer completes

Returns

Returns a new two-parameter consumer that executes the current consumer and the subsequent consumer in sequence.

Examples

use std::sync::Arc;
use std::sync::atomic::{AtomicI32, Ordering};
use qubit_function::consumers::*;

let counter1 = Arc::new(AtomicI32::new(0));
let counter2 = Arc::new(AtomicI32::new(0));

let bi_consumer1 = BoxBiConsumer::new({
    let counter = Arc::clone(&counter1);
    move |key: &String, value: &i32| {
        counter.fetch_add(*value, Ordering::SeqCst);
    }
});

let bi_consumer2 = BoxBiConsumer::new({
    let counter = Arc::clone(&counter2);
    move |key: &String, value: &i32| {
        counter.fetch_add(*value * 2, Ordering::SeqCst);
    }
});

let chained = bi_consumer1.and_then(bi_consumer2);
chained.accept(&"test".to_string(), &3);
// counter1 = 3, counter2 = 6

Examples found in repository

examples/consumers/bi_consumer_once_demo.rs (lines 47-50)

fn main() {
    println!("=== BiConsumerOnce Demo ===\n");

    // 1. Basic usage
    println!("1. Basic usage:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Sum: {}", x + y);
    });
    consumer.accept(&10, &5);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 2. Method chaining
    println!("2. Method chaining:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let chained = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l1.lock().unwrap().push(*x + *y);
        println!("  First: sum={}", x + y);
    })
    .and_then(move |x: &i32, y: &i32| {
        l2.lock().unwrap().push(*x * *y);
        println!("  Second: product={}", x * y);
    });
    chained.accept(&5, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 3. Conditional execution - true case
    println!("3. Conditional execution - true case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&5, &3);
    println!("  Positive values: {:?}\n", *log.lock().unwrap());

    // 4. Conditional execution - false case
    println!("4. Conditional execution - false case:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let conditional = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    })
    .when(|x: &i32, y: &i32| *x > 0 && *y > 0);
    conditional.accept(&-5, &3);
    println!("  Negative value (unchanged): {:?}\n", *log.lock().unwrap());

    // 5. Conditional branching
    println!("5. Conditional branching:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l1 = log.clone();
    let l2 = log.clone();
    let branch = BoxBiConsumerOnce::new(move |x: &i32, _y: &i32| {
        l1.lock().unwrap().push(*x);
    })
    .when(|x: &i32, y: &i32| *x > *y)
    .or_else(move |_x: &i32, y: &i32| {
        l2.lock().unwrap().push(*y);
    });
    branch.accept(&15, &10);
    println!("  When x > y: {:?}\n", *log.lock().unwrap());

    // 6. Working with closures directly
    println!("6. Working with closures directly:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let closure = move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
        println!("  Processed: {}", x + y);
    };
    closure.accept(&10, &20);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    // 7. Moving captured values
    println!("7. Moving captured values:");
    let data = vec![1, 2, 3, 4, 5];
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        println!("  x={}, y={}", x, y);
        println!("  Captured data: {:?}", data);
        println!("  Data sum: {}", data.iter().sum::<i32>());
    });
    consumer.accept(&5, &3);
    // data is no longer available here
    println!();

    // 8. Initialization callback
    println!("8. Initialization callback:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let init_callback = BoxBiConsumerOnce::new(move |width: &i32, height: &i32| {
        println!("  Initializing with dimensions: {}x{}", width, height);
        l.lock().unwrap().push(*width * *height);
    });
    init_callback.accept(&800, &600);
    println!("  Areas: {:?}\n", *log.lock().unwrap());

    // 9. Cleanup callback
    println!("9. Cleanup callback:");
    let cleanup = BoxBiConsumerOnce::new(|count: &i32, total: &i32| {
        println!("  Cleanup: processed {} out of {} items", count, total);
        println!(
            "  Success rate: {:.1}%",
            (*count as f64 / *total as f64) * 100.0
        );
    });
    cleanup.accept(&85, &100);
    println!();

    // 10. Name support
    println!("10. Name support:");
    let mut named_consumer = BoxBiConsumerOnce::<i32, i32>::noop();
    println!("  Initial name: {:?}", named_consumer.name());

    named_consumer.set_name("init_callback");
    println!("  After setting name: {:?}", named_consumer.name());
    println!("  Display: {}", named_consumer);
    named_consumer.accept(&1, &2);
    println!();

    // 11. Print helpers
    println!("11. Print helpers:");
    let print = BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("{}, {}", x, y));
    print.accept(&42, &10);

    let print_with =
        BoxBiConsumerOnce::new(|x: &i32, y: &i32| println!("Dimensions: {}, {}", x, y));
    print_with.accept(&800, &600);
    println!();

    // 12. Converting to function
    println!("12. Converting to function:");
    let log = Arc::new(Mutex::new(Vec::new()));
    let l = log.clone();
    let consumer = BoxBiConsumerOnce::new(move |x: &i32, y: &i32| {
        l.lock().unwrap().push(*x + *y);
    });
    let func = consumer.into_fn();
    func(&7, &3);
    println!("  Log: {:?}\n", *log.lock().unwrap());

    println!("=== Demo Complete ===");
}

Trait Implementations

impl<T, U> BiConsumerOnce<T, U> for BoxBiConsumerOnce<T, U>

fn accept(self, first: &T, second: &U)

Performs the one-time consumption operation

fn into_box(self) -> BoxBiConsumerOnce<T, U>

Converts to BoxBiConsumerOnce

fn into_fn(self) -> impl FnOnce(&T, &U)

Converts to a closure

impl<T, U> Debug for BoxBiConsumerOnce<T, U>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T, U> Display for BoxBiConsumerOnce<T, U>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.