578. <Right-side rebalancing after PRB deletion 578> =
struct prb_node *w = f->prb_link[0];
if (w->prb_color == PRB_RED)
{
<Ensure w is black in right-side PRB deletion rebalancing 579>
}
if ((w->prb_link[0] == NULL
|| w->prb_link[0]->prb_color == PRB_BLACK)
&& (w->prb_link[1] == NULL
|| w->prb_link[1]->prb_color == PRB_BLACK))
{
<Case 1 in right-side PRB deletion rebalancing 580>
}
else
{
if (w->prb_link[0] == NULL
|| w->prb_link[0]->prb_color == PRB_BLACK)
{
<Transform right-side PRB deletion rebalancing case 3 into case 2 582>
}
<Case 2 in right-side PRB deletion rebalancing 581>
break;
}
This code is included in 571.
579. <Ensure w is black in right-side PRB deletion rebalancing 579> =
w->prb_color = PRB_BLACK;
f->prb_color = PRB_RED;
f->prb_link[0] = w->prb_link[1];
w->prb_link[1] = f;
g->prb_link[g->prb_link[0] != f] = w;
w->prb_parent = f->prb_parent;
f->prb_parent = w;
g = w;
w = f->prb_link[0];
w->prb_parent = f;
This code is included in 578.
580. <Case 1 in right-side PRB deletion rebalancing 580> =
w->prb_color = PRB_RED;
This code is included in 578.
581. <Case 2 in right-side PRB deletion rebalancing 581> =
w->prb_color = f->prb_color;
f->prb_color = PRB_BLACK;
w->prb_link[0]->prb_color = PRB_BLACK;
f->prb_link[0] = w->prb_link[1];
w->prb_link[1] = f;
g->prb_link[g->prb_link[0] != f] = w;
w->prb_parent = f->prb_parent;
f->prb_parent = w;
if (f->prb_link[0] != NULL)
f->prb_link[0]->prb_parent = f;
This code is included in 578.
582. <Transform right-side PRB deletion rebalancing case 3 into case 2 582> =
struct prb_node *y = w->prb_link[1];
y->prb_color = PRB_BLACK;
w->prb_color = PRB_RED;
w->prb_link[1] = y->prb_link[0];
y->prb_link[0] = w;
if (w->prb_link[1] != NULL)
w->prb_link[1]->prb_parent = w;
w = f->prb_link[0] = y;
w->prb_link[0]->prb_parent = w;
This code is included in 578.
15.4.3 Step 4: Finish Up
|
15.4 Deletion
|
15.5 Testing
|