is-tree 0.9.9

Everything is a tree
Documentation 
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//! Traits for objects that have a parent.

use crate::KnowsVisitor;

/// A trait for objects that have a parent.
pub trait HasParent: KnowsVisitor {
    /// Gets the parent of the object.
    fn parent(&self) -> Option<Self::Visitor>;
}

/// A trait for objects that have a parent mutably.
/// By design, accessing a Visitor parent is unsafe.
pub unsafe trait HasParentMut: KnowsVisitor {
    /// Gets the parent of the object.
    unsafe fn parent_mut(&mut self) -> Option<Self::VisitorMut>;
}

impl<T> HasParent for Box<T>
where T: HasParent
{
    fn parent(&self) -> Option<Self::Visitor> {
        self.as_ref().parent()
    }
}

unsafe impl<T> HasParentMut for Box<T>
where T: HasParentMut
{
    unsafe fn parent_mut(&mut self) -> Option<Self::VisitorMut> {
        self.as_mut().parent_mut()
    }
}