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- // 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;
- }
-