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Replace append_from and prepend_from with DList::append

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This commit is contained in:
Matt Brubeck 2015-02-12 10:37:00 -08:00
parent 29d24a5049
commit 76a2653f8f
2 changed files with 8 additions and 56 deletions
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50
components/util/dlist.rs
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@ -71,55 +71,9 @@ pub fn split<T>(list: &mut DList<T>) -> DList<T> {
}
}
/// Appends the items in the other list to this one, leaving the other list empty.
#[inline]
pub fn append_from<T>(this: &mut DList<T>, other: &mut DList<T>) {
unsafe {
let this = mem::transmute::<&mut DList<T>,&mut RawDList<T>>(this);
let other = mem::transmute::<&mut DList<T>,&mut RawDList<T>>(other);
if this.length == 0 {
this.head = mem::replace(&mut other.head, ptr::null_mut());
this.tail = mem::replace(&mut other.tail, ptr::null_mut());
this.length = mem::replace(&mut other.length, 0);
return
}
let old_other_head = mem::replace(&mut other.head, ptr::null_mut());
if old_other_head.is_null() {
return
}
(*old_other_head).prev = this.tail;
(*this.tail).next = old_other_head;
this.tail = mem::replace(&mut other.tail, ptr::null_mut());
this.length += other.length;
other.length = 0;
}
}
/// Prepends the items in the other list to this one, leaving the other list empty.
#[inline]
pub fn prepend_from<T>(this: &mut DList<T>, other: &mut DList<T>) {
unsafe {
let this = mem::transmute::<&mut DList<T>,&mut RawDList<T>>(this);
let other = mem::transmute::<&mut DList<T>,&mut RawDList<T>>(other);
if this.length == 0 {
this.head = mem::replace(&mut other.head, ptr::null_mut());
this.tail = mem::replace(&mut other.tail, ptr::null_mut());
this.length = mem::replace(&mut other.length, 0);
return
}
let old_other_tail = mem::replace(&mut other.tail, ptr::null_mut());
if old_other_tail.is_null() {
return
}
(*old_other_tail).next = this.head;
(*this.head).prev = old_other_tail;
this.head = mem::replace(&mut other.head, ptr::null_mut());
this.length += other.length;
other.length = 0;
}
other.append(this);
mem::swap(this, other);
}