Struct Once

pub struct Once<T>(pub T);

A wrapper for passing FnOnce callbacks into the js! macro.

Since it only supports FnOnce callbacks there is no need to drop() them manually on the JavaScript side provided they were actually called.

You still need to drop() any callbacks which were not called.

Examples

let callback = || { println!( "Hello world!" ); };
js! {
    var cb = @{Once(callback)};
    cb();
    // There is no need to drop it; since the function
    // is only callable once it automatically drops
    // itself after being called.
}

Tuple Fields

0: T

Trait Implementations

impl<T> Debug for Once<T>

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

Formats the value using the given formatter.