manage 0.12.0

Manage assets and other resources
Documentation 
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use refs::Weak;

use crate::Managed;

pub trait ExistsManaged {
    fn exists_managed(&self) -> bool;
}

impl<T: Managed> ExistsManaged for Weak<T> {
    fn exists_managed(&self) -> bool {
        self.was_initialized()
    }
}