Struct RcMutator

Source

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

Expand description

RcMutator struct

A stateless mutator implementation based on Rc<dyn Fn(&mut T)> for single-threaded shared ownership scenarios. This type allows multiple references to the same mutator without the overhead of thread safety.

§Features

Shared Ownership: Cloneable via Rc, multiple owners allowed
Single-Threaded: Not thread-safe, cannot be sent across threads
Stateless: Cannot modify captured environment (uses Fn not FnMut)
Chainable: Method chaining via &self (non-consuming)
Performance: More efficient than ArcMutator (no locking)

§Use Cases

Choose RcMutator when:

The mutator needs to be shared within a single thread for stateless operations
Thread safety is not required
Performance is important (avoiding lock overhead)

§Examples

use prism3_function::{Mutator, RcMutator};

let mutator = RcMutator::new(|x: &mut i32| *x *= 2);
let clone = mutator.clone();

let mut value = 5;
mutator.apply(&mut value);
assert_eq!(value, 10);

§Author

Haixing Hu

Implementations§

Source §

impl<T> RcMutator<T>
where T: 'static,

Source

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

Creates a new mutator.

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

Source

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

Creates a new named mutator.

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: Fn(&mut T) + 'static,

Creates a new named mutator 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 mutator.

§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 mutator.

§Parameters

name - The name to set for this mutator

Source

pub fn noop() -> Self

Creates a no-operation mutator.

Creates a mutator that does nothing when called. Useful for default values or placeholder implementations.

§Returns

Returns a new mutator instance that performs no operation.

Source

pub fn when(&self, predicate: P) -> RcConditionalMutator<T>
where P: Predicate<T> + 'static,

Creates a conditional mutator that executes based on predicate result.

§Parameters

predicate - The predicate to determine whether to execute the mutation operation

§Returns

Returns a conditional mutator that only executes when the predicate returns true.

§Examples

use std::sync::Arc;
use std::sync::atomic::{AtomicI32, Ordering};
use prism3_rust_function::mutators::*;

let counter = Arc::new(AtomicI32::new(0));
let mutator = ArcMutator::new({
    let counter = Arc::clone(&counter);
    move |value: &mut i32| {
        *value += counter.fetch_add(1, Ordering::SeqCst);
    }
});

let conditional = mutator.when(|value: &i32| *value > 0);
let mut val = 1;
conditional.apply(&mut val);  // val = 2 (1 + 1)
let mut val2 = -1;
conditional.apply(&mut val2); // not executed, val2 remains -1

Source

pub fn and_then<M>(&self, after: M) -> RcMutator<T>
where T: 'static, M: Mutator<T> + 'static,

Chains execution with another mutator, executing the current mutator first, then the subsequent mutator.

§Parameters

after - The subsequent mutator to execute after the current mutator completes

§Returns

Returns a new mutator that executes the current mutator and the subsequent mutator in sequence.

§Examples

use std::sync::Arc;
use std::sync::atomic::{AtomicI32, Ordering};
use prism3_rust_function::mutators::*;

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

let mutator1 = ArcMutator::new({
    let counter = Arc::clone(&counter1);
    move |value: &mut i32| {
        *value += counter.fetch_add(1, Ordering::SeqCst);
    }
});

let mutator2 = ArcMutator::new({
    let counter = Arc::clone(&counter2);
    move |value: &mut i32| {
        *value += counter.fetch_add(1, Ordering::SeqCst);
    }
});

let chained = mutator1.and_then(mutator2);
let mut val = 0;
chained.apply(&mut val);
// val = 2 (0 + 1 + 1)