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OSLBag.ccP
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1993-06-29
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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>.OSLBag.h"
Pix <T>OSLBag::seek(<T&> item, Pix i)
{
if (i == 0) i = p.first(); else next(i);
for (; 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;
}
int <T>OSLBag::nof(<T&> item)
{
int n = 0;
for (Pix i = p.first(); i != 0; p.next(i))
{
int cmp = <T>CMP(item, p(i));
if (cmp == 0)
++n;
else if (cmp < 0)
break;
}
return n;
}
Pix <T>OSLBag::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)
{
++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)
{
++count;
return p.ins_after(trail, item);
}
else
{
trail = i;
p.next(i);
}
}
}
}
void <T>OSLBag::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);
}
}
}
}
void <T>OSLBag::remove(<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)
{
do
{
--count;
p.del_front();
i = p.first();
} while (i != 0 && <T>EQ(item, p(i)));
}
else
{
Pix trail = i;
p.next(i);
while (i != 0)
{
cmp = <T>CMP(item, p(i));
if (cmp < 0)
return;
else if (cmp == 0)
{
do
{
--count;
p.del_after(trail);
i = trail;
next(i);
} while (i != 0 && <T>EQ(item, p(i)));
return;
}
else
{
trail = i;
p.next(i);
}
}
}
}
int <T>OSLBag::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;
}