Struct FnMap

pub struct FnMap(/* private fields */);

Single thread only FnMap implementation.

This implementation is zero cost.

Implementations

impl FnMap

pub fn new() -> Self

Examples found in repository

examples/example.rs (line 4)

fn main() {
    let map = FnMap::new();

    fn one() -> i32 {
        println!("one computed");
        1
    }
    
    let a = *map.get(|| map.get(one) + 1);
    dbg!(a);
    assert_eq!(a, 2);

    let b = *map.get(|| map.get(one) + 1);
    dbg!(b);
    assert_eq!(b, 2);

    let c = *map.get(one);
    dbg!(c);
    assert_eq!(c, 1);
}

pub fn get_ptr<T: 'static + Send>( &self, key_fn: impl FnOnce() -> T, ) -> NonNull<T>

pub fn get<T: 'static + Send>(&self, key: impl FnOnce() -> T) -> &T

Get or compute value using key

Examples found in repository

examples/example.rs (line 11)

fn main() {
    let map = FnMap::new();

    fn one() -> i32 {
        println!("one computed");
        1
    }
    
    let a = *map.get(|| map.get(one) + 1);
    dbg!(a);
    assert_eq!(a, 2);

    let b = *map.get(|| map.get(one) + 1);
    dbg!(b);
    assert_eq!(b, 2);

    let c = *map.get(one);
    dbg!(c);
    assert_eq!(c, 1);
}

pub fn get_mut<T: 'static + Send>(&mut self, key: impl FnOnce() -> T) -> &mut T

Get or compute value using key

pub fn reset(&mut self)

Reset stored values

Trait Implementations

impl Debug for FnMap

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

Formats the value using the given formatter.

impl Default for FnMap

fn default() -> FnMap

Returns the “default value” for a type.

impl Send for FnMap