Struct oxygengine_core::ecs::shred::Entry

pub struct Entry<'a, T> where
    T: 'a,  { /* fields omitted */ }

An entry to a resource of the World struct. This is similar to the Entry API found in the standard library.

Examples

use shred::World;

#[derive(Debug)]
struct Res(i32);

let mut world = World::empty();

let value = world.entry().or_insert(Res(4));
println!("{:?}", value.0 * 2);

Implementations

impl<'a, T> Entry<'a, T> where
    T: Resource + 'a, 

pub fn or_insert(self, v: T) -> FetchMut<'a, T>

Returns this entry’s value, inserts and returns v otherwise.

Please note that you should use or_insert_with in case the creation of the value is expensive.

pub fn or_insert_with<F>(self, f: F) -> FetchMut<'a, T> where
    F: FnOnce() -> T, 

Returns this entry’s value, inserts and returns the return value of f otherwise.