Macro using

macro_rules! using {
    ($resource:expr, $param:ident -> $body:block) => { ... };
}

Executes a closure with a resource, ensuring the resource is properly utilized and dropped.

Parameters

• resource: The resource to be used.
• closure: A closure that takes ownership of the resource and performs operations with it.

Examples

use use_with::using;

struct Resource(u32);

impl Resource {
    fn new(value: u32) -> Self {
        Resource(value)
    }
}

let result = using!(Resource::new(10), it -> {
    it.0 + 32
});
assert_eq!(result, 42);

let resource = Resource::new(10);
let result = using!(resource, value -> {
    value.0 + 32
});
assert_eq!(result, 42);

Safety

• The closure must not retain references to the resource beyond the scope of this function, as the resource will be dropped after the closure executes.