home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
NeXTSTEP 3.2 (Developer)
/
NS_dev_3.2.iso
/
NextDeveloper
/
Headers
/
g++
/
gen
/
OXPBag.ccP
< prev
next >
Wrap
Text File
|
1993-06-29
|
5KB
|
222 lines
// This may look like C code, but it is really -*- C++ -*-
/*
Copyright (C) 1988 Free Software Foundation
written by Doug Lea (dl@rocky.oswego.edu)
This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version. This library is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef __GNUG__
#pragma implementation
#endif
#include "<T>.OXPBag.h"
Pix <T>OXPBag::seek(<T&> item, Pix i)
{
if (i == 0)
{
int l = p.low();
int h = p.high();
while (l <= h)
{
int mid = (l + h) / 2;
int cmp = <T>CMP(item, p[mid]);
if (cmp == 0)
{
while (mid > p.low() && <T>EQ(item, p[mid - 1])) --mid;
return p.index_to_Pix(mid);
}
else if (cmp < 0)
h = mid - 1;
else
l = mid + 1;
}
return 0;
}
int cmp = <T>CMP(item, p(i));
if (cmp == 0)
{
next(i);
return (<T>EQ(item, p(i)))? i : 0;
}
else if (cmp < 0)
{
int ind = p.Pix_to_index(i);
int l = ind;
int h = p.high();
while (l <= h)
{
int mid = (l + h) / 2;
cmp = <T>CMP(item, p[mid]);
if (cmp == 0)
{
while (mid > ind && <T>EQ(item, p[mid - 1])) --mid;
return p.index_to_Pix(mid);
}
else if (cmp < 0)
h = mid - 1;
else
l = mid + 1;
}
return 0;
}
else
return 0;
}
int <T>OXPBag::nof(<T&> item)
{
int l = p.low();
int h = p.high();
while (l <= h)
{
int mid = (l + h) / 2;
int cmp = <T>CMP(item, p[mid]);
if (cmp == 0)
{
l = h = mid;
while (l > p.low() && <T>EQ(item, p[l - 1])) --l;
while (h < p.high() && <T>EQ(item, p[h + 1])) ++h;
return h - l + 1;
}
else if (cmp < 0)
h = mid - 1;
else
l = mid + 1;
}
return 0;
}
Pix <T>OXPBag::add(<T&> item)
{
if (count == 0)
{
++count;
return p.index_to_Pix(p.add_high(item));
}
int l = p.low();
int h = p.high();
while (l <= h)
{
int mid = (l + h) / 2;
int cmp = <T>CMP(item, p[mid]);
if (cmp == 0)
{
l = mid;
break;
}
else if (cmp < 0)
h = mid - 1;
else
l = mid + 1;
}
// add on whichever side is shortest
++count;
if (l == p.fence())
return p.index_to_Pix(p.add_high(item));
else if (l == p.low())
return p.index_to_Pix(p.add_low(item));
else
{
if (p.high() - l < l - p.low())
{
h = p.add_high(p.high_element());
for (int i = h - 1; i > l; --i) p[i] = p[i-1];
}
else
{
--l;
h = p.add_low(p.low_element());
for (int i = h + 1; i < l; ++i) p[i] = p[i+1];
}
p[l] = item;
return p.index_to_Pix(l);
}
}
void <T>OXPBag::del(<T&> item)
{
int l = p.low();
int h = p.high();
while (l <= h)
{
int mid = (l + h) / 2;
int cmp = <T>CMP(item, p[mid]);
if (cmp == 0)
{
--count;
if (p.high() - mid < mid - p.low())
{
for (int i = mid; i < p.high(); ++i) p[i] = p[i+1];
p.del_high();
}
else
{
for (int i = mid; i > p.low(); --i) p[i] = p[i-1];
p.del_low();
}
return;
}
else if (cmp < 0)
h = mid - 1;
else
l = mid + 1;
}
}
void <T>OXPBag::remove(<T&> item)
{
int l = p.low();
int h = p.high();
while (l <= h)
{
int mid = (l + h) / 2;
int cmp = <T>CMP(item, p[mid]);
if (cmp == 0)
{
l = h = mid;
while (l > p.low() && <T>EQ(item, p[l - 1])) --l;
while (h < p.high() && <T>EQ(item, p[h + 1])) ++h;
int n = h - l + 1;
count -= n;
if (p.high() - h < l - p.low())
{
h = p.high() - n;
for (int i = l; i <= h; ++i) p[i] = p[i+n];
while (n-- > 0) p.del_high();
}
else
{
l = p.low() + n;
for (int i = h; i >= l; --i) p[i] = p[i-n];
while (n-- > 0) p.del_low();
}
return;
}
else if (cmp < 0)
h = mid - 1;
else
l = mid + 1;
}
}
int <T>OXPBag::OK()
{
int v = p.OK();
v &= count == p.length();
for (int i = p.low(); i < p.high(); ++i) v &= <T>CMP(p[i], p[i+1]) <= 0;
if (!v) error("invariant failure");
return v;
}