home *** CD-ROM | disk | FTP | other *** search
- // 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
- #ifdef __GNUG__
- #pragma implementation
- #endif
- #include "<T>.OSLSet.h"
-
-
- Pix <T>OSLSet::seek(<T&> item)
- {
- for (Pix i = p.first(); i != 0; p.next(i))
- {
- int cmp = <T>CMP(item, p(i));
- if (cmp == 0)
- return i;
- else if (cmp < 0)
- return 0;
- }
- return 0;
- }
-
- Pix <T>OSLSet::add(<T&> item)
- {
- Pix i = p.first();
- if (i == 0)
- {
- ++count;
- return p.prepend(item);
- }
- int cmp = <T>CMP(item, p(i));
- if (cmp == 0)
- return i;
- else if (cmp < 0)
- {
- ++count;
- return p.prepend(item);
- }
- else
- {
- Pix trail = i;
- p.next(i);
- for (;;)
- {
- if (i == 0)
- {
- ++count;
- return p.append(item);
- }
- cmp = <T>CMP(item, p(i));
- if (cmp == 0)
- return i;
- else if (cmp < 0)
- {
- ++count;
- return p.ins_after(trail, item);
- }
- else
- {
- trail = i;
- p.next(i);
- }
- }
- }
- }
-
- void <T>OSLSet::del(<T&> item)
- {
- Pix i = p.first();
- if (i == 0)
- return;
- int cmp = <T>CMP(item, p(i));
- if (cmp < 0)
- return;
- else if (cmp == 0)
- {
- --count;
- p.del_front();
- }
- else
- {
- Pix trail = i;
- p.next(i);
- while (i != 0)
- {
- cmp = <T>CMP(item, p(i));
- if (cmp < 0)
- return;
- else if (cmp == 0)
- {
- --count;
- p.del_after(trail);
- return;
- }
- else
- {
- trail = i;
- p.next(i);
- }
- }
- }
- }
-
-
- int <T>OSLSet::operator <= (<T>OSLSet& b)
- {
- if (count > b.count) return 0;
- Pix i = first();
- Pix j = b.first();
- for (;;)
- {
- if (i == 0)
- return 1;
- else if (j == 0)
- return 0;
- int cmp = <T>CMP(p(i), b.p(j));
- if (cmp == 0)
- {
- next(i); b.next(j);
- }
- else if (cmp < 0)
- return 0;
- else
- b.next(j);
- }
- }
-
- int <T>OSLSet::operator == (<T>OSLSet& b)
- {
- if (count != b.count) return 0;
- if (count == 0) return 1;
- Pix i = p.first();
- Pix j = b.p.first();
- while (i != 0)
- {
- if (!<T>EQ(p(i),b.p(j))) return 0;
- next(i);
- b.next(j);
- }
- return 1;
- }
-
-
- void <T>OSLSet::operator |= (<T>OSLSet& b)
- {
- if (&b == this || b.count == 0)
- return;
- else
- {
- Pix j = b.p.first();
- Pix i = p.first();
- Pix trail = 0;
- for (;;)
- {
- if (j == 0)
- return;
- else if (i == 0)
- {
- for (; j != 0; b.next(j))
- {
- ++count;
- p.append(b.p(j));
- }
- return;
- }
- int cmp = <T>CMP(p(i), b.p(j));
- if (cmp <= 0)
- {
- if (cmp == 0) b.next(j);
- trail = i;
- next(i);
- }
- else
- {
- ++count;
- if (trail == 0)
- trail = p.prepend(b.p(j));
- else
- trail = p.ins_after(trail, b.p(j));
- b.next(j);
- }
- }
- }
- }
-
-
- void <T>OSLSet::operator -= (<T>OSLSet& b)
- {
- if (&b == this)
- clear();
- else if (count != 0 && b.count != 0)
- {
- Pix i = p.first();
- Pix j = b.p.first();
- Pix trail = 0;
- for (;;)
- {
- if (j == 0 || i == 0)
- return;
- int cmp = <T>CMP(p(i), b.p(j));
- if (cmp == 0)
- {
- --count;
- b.next(j);
- if (trail == 0)
- {
- p.del_front();
- i = p.first();
- }
- else
- {
- next(i);
- p.del_after(trail);
- }
- }
- else if (cmp < 0)
- {
- trail = i;
- next(i);
- }
- else
- b.next(j);
- }
- }
- }
-
- void <T>OSLSet::operator &= (<T>OSLSet& b)
- {
- if (b.count == 0)
- clear();
- else if (&b != this && count != 0)
- {
- Pix i = p.first();
- Pix j = b.p.first();
- Pix trail = 0;
- for (;;)
- {
- if (i == 0)
- return;
- else if (j == 0)
- {
- if (trail == 0)
- {
- p.clear();
- count = 0;
- }
- else
- {
- while (i != 0)
- {
- --count;
- next(i);
- p.del_after(trail);
- }
- }
- return;
- }
- int cmp = <T>CMP(p(i), b.p(j));
-
- if (cmp == 0)
- {
- trail = i;
- next(i);
- b.next(j);
- }
- else if (cmp < 0)
- {
- --count;
- if (trail == 0)
- {
- p.del_front();
- i = p.first();
- }
- else
- {
- next(i);
- p.del_after(trail);
- }
- }
- else
- b.next(j);
- }
- }
- }
-
-
- int <T>OSLSet::OK()
- {
- int v = p.OK();
- v &= count == p.length();
- Pix trail = p.first();
- if (trail == 0)
- v &= count == 0;
- else
- {
- Pix i = trail; next(i);
- while (i != 0)
- {
- v &= <T>CMP(p(trail), p(i)) < 0;
- trail = i;
- next(i);
- }
- }
- if (!v) error("invariant failure");
- return v;
- }
-