| 6.5.4 Symmetric Case |
|
235. <Right-side rebalancing after RB deletion 235> =
struct rb_node *w = pa[k - 1]->rb_link[0];
if (w->rb_color == RB_RED)
{
<Ensure w is black in right-side RB deletion rebalancing 236>
}
if ((w->rb_link[0] == NULL
|| w->rb_link[0]->rb_color == RB_BLACK)
&& (w->rb_link[1] == NULL
|| w->rb_link[1]->rb_color == RB_BLACK))
{ <Case 1 in right-side RB deletion rebalancing 237> }
else
{
if (w->rb_link[0] == NULL
|| w->rb_link[0]->rb_color == RB_BLACK)
{
<Transform right-side RB deletion rebalancing case 3 into case 2 238>
}
<Case 2 in right-side RB deletion rebalancing 239>
break;
}
This code is included in 228.
236. <Ensure w is black in right-side RB deletion rebalancing 236> = w->rb_color = RB_BLACK; pa[k - 1]->rb_color = RB_RED; pa[k - 1]->rb_link[0] = w->rb_link[1]; w->rb_link[1] = pa[k - 1]; pa[k - 2]->rb_link[da[k - 2]] = w; pa[k] = pa[k - 1]; da[k] = 1; pa[k - 1] = w; k++; w = pa[k - 1]->rb_link[0];
This code is included in 235, 366, and 478.
237. <Case 1 in right-side RB deletion rebalancing 237> = w->rb_color = RB_RED;
This code is included in 235, 367, and 478.
238. <Transform right-side RB deletion rebalancing case 3 into case 2 238> = struct rb_node *y = w->rb_link[1]; y->rb_color = RB_BLACK; w->rb_color = RB_RED; w->rb_link[1] = y->rb_link[0]; y->rb_link[0] = w; w = pa[k - 1]->rb_link[0] = y;
This code is included in 235, 369, and 482.
239. <Case 2 in right-side RB deletion rebalancing 239> = w->rb_color = pa[k - 1]->rb_color; pa[k - 1]->rb_color = RB_BLACK; w->rb_link[0]->rb_color = RB_BLACK; pa[k - 1]->rb_link[0] = w->rb_link[1]; w->rb_link[1] = pa[k - 1]; pa[k - 2]->rb_link[da[k - 2]] = w;