qubit_function::suppliers::supplier_once

Struct BoxSupplierOnce

pub struct BoxSupplierOnce<T> { /* private fields */ }

Expand description

Box-based one-time supplier.

Uses Box<dyn FnOnce() -> T> for one-time value generation. Can only call get() once, consuming the supplier.

§Examples

§Lazy Initialization

use qubit_function::{BoxSupplierOnce, SupplierOnce};

let once = BoxSupplierOnce::new(|| {
    println!("Expensive initialization");
    42
});

let value = once.get(); // Prints: Expensive initialization
assert_eq!(value, 42);

§Moving Captured Values

use qubit_function::{BoxSupplierOnce, SupplierOnce};

let resource = String::from("data");
let once = BoxSupplierOnce::new(move || resource);

let value = once.get();
assert_eq!(value, "data");

§Author

Haixing Hu

Implementations§

Source §

impl<T> BoxSupplierOnce<T>

Source

pub fn new<F>(f: F) -> Self
where F: FnOnce() -> T + 'static,

Creates a new supplier.

Wraps the provided closure in the appropriate smart pointer type for this supplier implementation.

Source

pub fn new_with_name<F>(name: &str, f: F) -> Self
where F: FnOnce() -> T + 'static,

Creates a new named supplier.

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

Source

pub fn new_with_optional_name<F>(f: F, name: Option<String>) -> Self
where F: FnOnce() -> T + 'static,

Creates a new named supplier with an optional name.

Wraps the provided closure and assigns it an optional name.

Source

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

Gets the name of this supplier.

§Returns

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

Source

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

Sets the name of this supplier.

§Parameters

name - The name to set for this supplier

Source

pub fn constant(value: T) -> Self
where T: Clone + 'static,

Creates a supplier that returns a constant value.

Creates a supplier that always returns the same value. Useful for default values or placeholder implementations.

§Parameters

value - The constant value to return

§Returns

Returns a new supplier instance that returns the constant value.

Source

pub fn map<U, M>(self, mapper: M) -> BoxSupplierOnce
where T: 'static, M: Transformer<T, U> + 'static, U: 'static,

Maps the output using a transformation function.

Consumes self and returns a new supplier that applies the mapper to each output.

§Parameters

mapper - The transformer to apply to the output. Can be a closure, function pointer, or any type implementing Transformer<T, U>.

§Returns

A new mapped supplier

§Examples

use qubit_function::suppliers::*;

let supplier = BoxSupplier::new(|| 10);
let mapped = supplier
    .map(|x| x * 2)
    .map(|x| x + 5);
assert_eq!(mapped.get(), 25);

Source

pub fn filter(self, predicate: P) -> BoxSupplierOnce<Option<T>>
where T: 'static, P: Predicate<T> + 'static,

Filters output based on a predicate.

Returns a new supplier that returns Some(value) if the predicate is satisfied, None otherwise.

§Parameters

predicate - The predicate to test the supplied value

§Returns

A new filtered supplier

§Examples

use qubit_function::suppliers::*;

let supplier = BoxSupplier::new(|| 42);
let filtered = supplier.filter(|x| x % 2 == 0);

assert_eq!(filtered.get(), Some(42));

Source

pub fn zip<U, S>(self, other: S) -> BoxSupplierOnce<(T, U)>
where T: 'static, S: SupplierOnce + 'static, U: 'static,

Combines this supplier with another, producing a tuple.

Consumes both suppliers and returns a new supplier that produces tuples.

§Parameters

other - The other supplier to combine with

§Returns

A new supplier that produces tuples

§Examples

use qubit_function::suppliers::*;

let first = BoxSupplier::new(|| 42);
let second = BoxSupplier::new(|| "hello");
let zipped = first.zip(second);

assert_eq!(zipped.get(), (42, "hello"));